Cerebral Lateralisation for Emotion Processing of Chimeric Faces in Individuals with Autism Spectrum Disorder
subject: autism spectrum disorder, cerebral lateralisation, emotion processing, adults, children, chimeric faces task
description: Many studies have suggested that typical lateralisation for emotion processing tasks, such as facial emotion recognition, is lateralised to the right-hemisphere, with different emotions eliciting differing strengths of lateralisation (Bourne, 2010). However, there has been much debate as to the lateralisation of individuals with autism spectrum disorder (ASD) (Ashwin et al., 2005; Shamay-Tsoory et al., 2010). This study assessed the cerebral lateralisation of 30 adults with ASD, five children with ASD, 435 neurotypical adults and ten neurotypical children in a chimeric faces task, and aimed to identify whether the atypical lateralisation seen in children with ASD persists into adulthood (Taylor et al., 2012). Furthermore, the study aimed to identify whether lateralisation strength is affected by the emotion of the facial stimuli. No emotion- or age-related change in lateralisation was found, however, participants with ASD demonstrated a weaker right-hemispheric lateralisation compared to neurotypical participants. Therefore, this study supported the concept that individuals with ASD show atypical lateralisation which persists into adulthood, however, no evidence was found to support the concept that different emotions elicit different strengths of lateralisation.
creator: Alexandra Crossley
source: Method Participants Data from a total of 481 participants with native level English proficiency (or age expected language development in children), normal or corrected-to-normal vision and no history of neurological disease or hearing loss were analysed for the current study (Table 1). Participants in the group ‘adults with ASD’ (N = 30; age: M = 30.17, SD = 9.85) were recruited through adverts on social media, through Prolific Academic (www.prolific.co), and through word of mouth. Participants in the groups ‘children with ASD’ (N = 5; age: M = 6.8, SD = 1.48) and ‘neurotypical children’ (N = 11; age: M = 7.0, SD = 1.90) were recruited through primary schools and word of mouth (Brooks, 2023), and parents of potential child participants were required to email a researcher to express their interest in participation. Participants in the group ‘neurotypical adults’ (N = 435; age: M = 29.44, SD = 8.03) were recruited through Prolific Academic (www.prolific.co) as part of a larger online behavioural laterality battery (Parker et al., 2021). Of the 481 participants who took part in the study, 32 were excluded during the data cleaning process (see Table 1 and Data Analysis for further information). Measures As part of the study, a series of questionnaires were administered to collect information about the participants to ensure that individual differences could be accounted for. Participants were asked to complete the study and its associated questionnaires and tasks prior to beginning the main chimeric faces task, and were requested to use a desktop or laptop computer for the entirety of the study. For the ‘neurotypical children’ and ‘children with ASD’ groups, parents were asked to complete the questionnaires on behalf of the children and were asked to be present for the tasks, which were completed during a Microsoft Teams call with a researcher. The study was completed online using the Gorilla Experiment Builder (www.gorilla.sc), a cloud-based tool for collecting data in…
publisher: Lancaster University
date: 5th September 2023
contributor: Mshary Al Jaber
rights: Open
relation: None
format: .csv
language: English
type: Data
coverage: LA1 4YF

Comparison of Ethical Decision-Making in Emergency Service Workers and Laypeople
subject: Trolley Problem, ethical dilemmas, time pressure, emergency service workers, decision-making.
description: The Trolley Problem is a theoretical ethical dilemma in which it is asked whether it is morally acceptable to actively kill one person to save five (Thomson, 1976). Emergency service workers (ESW) are often presented with ethical dilemmas, such as whether to resuscitate someone who does not want to be resuscitated (Guru et al., 1999). The present study investigated the differences in decisions made when faced with variations of the Trolley Problem between laypeople (non-ESW) and ESW. The effect of time pressure on making these decisions was also investigated, measured through response time. 99 participants were tested, 47 laypeople and 52 ESW. Participants were presented with five different Trolley Problem dilemmas wherein they could passively allow five people to die, or to make an active decision to sacrifice one person to save the others. These dilemmas had distinct variations, such as the one person being a co-worker, or where participants had to physically push and kill a large man. Half the participants were placed into a time pressure condition, and were told that they had a time limit in which to respond, when no time limit existed. Results showed that neither occupation nor time pressure significantly affected response time or participant choice. Further analysis suggested some interaction effects between occupation, time pressure, and specific dilemma types. Implications such as suggested training practices for ESW will be discussed. Criticisms of the methodology and recommendations for future research will also be discussed.
creator: James Wright
source: Method Sample This project aimed to use a total of 112 participants, with 56 of these being ESW, and 56 being laypeople. This number was calculated using the G*Power software, using an alpha of .05, power of .8, and a medium expected effect size of .35, using five levels of measurement. In total, 99 participants were gathered for the present study. 47 of the sample were laypeople, whilst the other 52 were ESW. Of these, 22 were police officers, and 30 were ambulance crewmembers. Overall, ESW had an average of 7.7 years of experience (SD = 8.29), with ambulance staff having an average of 10.14 years (SD = 9.89), and police having an average of 4.52 years (SD = 4.17). Unfortunately, no other emergency service branches such as coast guard or firefighters completed the study. A gender split of 47 males to 48 females was gathered, along with an average age of 35.65 years old (SD = 12.98). Three participants declined to disclose their gender, and one participant identified as agender. Ethical Approval and Pre-Registration This study gained ethical approval on 13/04/2021, from members of the Psychology department at Lancaster University. This study was also pre-registered on the Open Science Frameworks website on 17/05/2021. This can be found at the following link: https://osf.io/4ecjg/?view_only=95615bd16f2c4a9db88dd77543780ec2 Materials Survey The present study was delivered through a Qualtrics survey file, created fully by the researcher. The survey contains standard psychological research documents, such as an information page, consent form, demographic information page, and debriefing. The survey also contains two sets of five vignettes describing ethical dilemmas for each condition of the experiment. Demographics Participants are asked to provide some demographic information: age, gender, and occupation. Participants are given options for occupation, including police, fire, or ambulance, as well as an option for ‘other’ emergency services, where a free typing box is …
publisher: Lancaster University
date: 08/09/2021
contributor: Paige Givin & Chloe Crawshaw
rights: Open
relation: None
format: Main Data_35645845/Excel.csv , 35645845 Occupation Response Time Sum Scores/Excel.csv , 35645845 Time Pressure Response Time Sum Scores/Excel.csv, 35645845_RStudio Code/RStudio.R
language: English
type: Data
coverage: LA1 4YW

Competence and Warmth: How Gender Impacts Perceptions of Male and Female Speakers.
subject: gender stereotypes competence, warmth stereotype content model
description: Using the stereotype content model as a theoretical background, this study aimed to investigate the relationship between gender stereotypes and judgements of warmth and competence. Visual appearance has long been used to research these judgements while auditory cues have often been overlooked. This study therefore focused on judgements made about voice and subsequently did not influence participants with predetermined gender labels. 61 participants – aged 19 to 60 – listened to either 2 male or 2 female speakers talk about domestic violence and cancer research. Domestic violence is here defined as a women-centric topic, while cancer research is considered gender neutral. Participants completed person perception inventories of each speaker, rating them on 7-point Likert scales in terms of 10 competence and 10 warmth items. They also completed a sexism inventory to determine whether sexism predicted a more favourable attitude toward male speakers. A 2 between gender (male vs female) by 2 within topic (domestic violence vs cancer research) ANOVA was conducted, and female speakers were judged as more competent than males when speaking on domestic violence but not cancer research. They were considered warmer than men in both cases. This indicates that women are seen as competent when speaking on issues that directly affect them, suggesting that they should be taken more seriously when speaking out about their own rights. However, traditional warmth stereotypes regarding women were upheld. This, along with further implications, are discussed.
creator: Jayne Summers
source: Items. 10 competence items and 10 warmth items were selected to compile a 20-item list of characteristics for participants to judge speakers on. Of these items, 11 were taken from Rudman & Glick (1999) and the remaining 9 were considered in the original SCM. Items used in the competence and warmth scales were found to be reliable across speech topics, namely cancer research (CR) and domestic violence (DV) (competenceCR α = .893, competenceDV α = .931). This indicates that the scales used were highly reliable. Similarly, for the warmth dimensions, Cronbach's Alpha was suitably high (WarmthCR α = .918, WarmthDV α = .944). The reliability for the sexism inventory was also acceptable, with an α value of .826. An example of several competence and warmth dimensions can be seen below, while a full list can be found in Appendix A. Competence: confident, ambitious, intelligent.. Warmth: trustworthy, likeable, supportive. Speeches. Two speeches were recorded for the purpose of the experiment, one focused on domestic violence and the other on cancer research. The speeches were written to closely match each other in terms of wording and the information being presented. For instance, the opening and closing sentences of each speech were similarly structured, as seen below. Table 1. Examples of speech text. Domestic Violence Cancer Research Opening sentence Domestic Violence. A topic that is often glossed over as something that effects other people - not me; not you. Cancer. A topic we don't often like to think about – something that effects other people, but not me: not you. Closing sentence By going to our website www.dvrefuges.co.uk you can find out more information about the great work women's refuges around the country do, and help them continue to change women's lives by donating to our cause. By going to our website www.ukcancer.co.uk you can find out more information about the great work that we do, and by donating to our cause, help us continue to help people diagnosed w…
publisher: Lancaster University
date: 2017
contributor: John Towse
rights: Open
format: data/SPSS.sav
language: English
type: Data
coverage: LA1 4YF

Contrast polarity of a stimulus does not affect the cueing effect
subject: Gaze cueing Contrast polarity Gaze perception
description: According to the contrast polarity effect, people’s attention is sensitive to dark objects within light backgrounds. According to the gaze-cueing effect, a human gaze shift attracts people’s attention towards the direction of the darker region of the observed eyes, thus the gaze-cueing effect depends on the contrast polarity of the observed eyes. Therefore, a human gaze is perceived as a darker spot within a lighter background. In the present study, combining the contrast polarity effect and the gaze-cueing effect we examined whether the colour contrast between a black and a white square that suddenly flip on a computer screen can have a similar effect to that of gaze-cueing. The prediction was that participants would perceive the side where the black square moved after the flipping as attentional cue, therefore when an object appeared on the side that the black square moved, reaction times would be shorter compared to when the object appeared on the opposite side. The results showed that reaction times in the two conditions did not differ significantly. Thus, the contrast polarity of a stimulus does not affect the cueing effect.
creator: Eleni Sevastopoulou
source: The experiment was conducted using a single within-subject design. The independent variable was the cue congruency, which consisted of two conditions: the object appeared either congruently or incongruently with the attentional cue. The dependent variable was the reaction times of the participants which were measured in millisecond (ms). Procedure. Each participant was tested individually in a quiet room at the library of Lancaster University. Participants were tested at different days and times, including morning and evening hours. The only people present in the room during the conduct of the experiment were the participant and the experimenter. In the beginning, participants were asked to read the experiment instructions from the computer screen and they were also given clarifications, if needed, by the researcher. Afterwards, the experiment started and two squares, one black and one white, sharing one side were presented on the screen for half a second. The side that the squares shared was located at the centre of the screen, therefore one square appeared on the left side of the screen and the other one on the right side of the screen. Then the squares flipped and changed position and the apparent motion of the two squares was the cue. One second after flipping, the squares disappeared and a picture of an object randomly appeared either on the left or on the right side of the screen for one more second. Afterwards, the object disappeared and the screen remained blank. The task of the participants was to press the appropriate keyboard button as fast and as accurately as possible, depending on the side of the screen where the object appeared. So, they had to press the «Q» button on the keyboard when the object appeared on the left side of the screen or the «P» button when the object appeared on the right side of the screen. They were given one second to respond to the object appearance. The sequence of the trials was the same for every participant. Each one of the …
publisher: Lancaster University
date: 2018
contributor: Ellie Ball
rights: Open
relation: None
format: data/Excel.csv
language: English
type: Data
coverage: LA1 4YF

Cortical Hyper Excitability correlating with Visual Distortions and Hallucinations
subject: visual distortions cortical hyper excitability Pattern Glare Task
description: Background: The primary focus of our study is how the abnormalities in the visual experiences such as the visual distortions or hallucinations result in the increase in the cortical hyper excitability. The aberrant neural activity causes visual distortions. Susceptibility to such visual distortions reflects elevated levels of cortical hyper excitability. Methods: Forty-eight individuals completed the "Pattern Glare Task" (where they viewed certain striped grating patterns with different spatial frequencies). Participants also completed the Cortical Hyperexcitability Index (Chi) and the Cambridge Depersonalization Scale (CDS). Results: Pattern glare task showed that individuals experienced more visual distortions in the Medium Frequency (3 cpd). A very small sample of the population showed effects of depersonalisation disorder. Based on our results, we can say that individuals did show an elevated level of cortical hyperexcitability. Conclusion: The study suggests that non-clinical population also experiences a certain level of increase in cortical hyper excitability. It only establishes the utility of pattern glare with regards to CHi and CDS to add to our existing knowledge.
creator: Nishtha Bakshi
source: Pattern Glare Test The pattern glare task includes stripy patterns on three separate cards each with different spatial frequencies; low spatial frequency baseline grating (approx. 0.5 cycles per degree), high spatial frequency baseline grating (approx. 12 cpd), and the crucial medium spatial frequency grating (approx. 3 cpd). The computerised version of the pattern glare task was modified for this experiment, as we were using a paper-based version (Wilkins, 1995; Wilkins et al., 1984) for the same. The stimuli used in the experiment are given in FIGURE 1. The individuals are asked to stare at the white dot in the center of each pattern for approximately 10-15 seconds, while holding each pattern at arm's length. Following, a series of questions are asked to the participant i.e. if they experienced any blurring of lines, bending of lines, fading, shimmering, flickering or shadowy shapes. The participants on the basis of their experience on viewing each pattern, rate the above questions from a score of 0-7 where, 0-minimum and 7-maximum (Wilkins et al., 1984; Conlon et al., 1999). The score is obtained for each pattern and the difference between Pattern 2 and Pattern 3 is recorded, which is called as the '3-12 difference'; in other words, the difference between high frequency and the medium frequency (3cpd – 12cpd). Cambridge Depersonalisation Scale The CDS is a self-reporting questionnaire and is used to measure the duration and frequency of any depersonalisation symptoms that individual experiences in the time frame of the past six months. (Sierra and Berrios, 1999). The CDS is an instrument containing 29 items. Each of the items in the scale are rated on the basis of Likert-scale both for frequency (0-4; where, 0=never, 1=rarely, 2=often, 3=very often, and 4=all the time) and duration based on its average on how much the experiences last (1-6; where 1=few seconds, 2=few minutes, 3=few hours, 4=about a day, 5=more than a day, and 6=more than a week). Its global score…
publisher: Lancaster University
date: 2017
contributor: John Towse
rights: Open
relation: None
format: Data/data spreadsheet.xlsx
language: English
type: Data
coverage: LA1 4YF

Cortical Hyper Excitability correlating with Visual Distortions and Hallucinations
description: The primary focus of our study concerned how abnormalities in visual experiences such as visual distortions or hallucinations result in increase in cortical hyper-excitability in the non-clinical population. Aberrant neural processes leads to anomalous experiences. Susceptibility to such visual distortions reflects elevated levels of cortical hyper excitability. On the account of methodology, Forty-eight non-clinical individuals completed the "Pattern Glare Task" where they viewed certain striped grating patterns with different spatial frequencies. The non-clinical participants also completed the Cortical Hyper-excitability Index (Chi) and the Cambridge Depersonalization Scale (CDS). From the analysis, Pattern glare task performance showed that individuals experienced more visual distortions in the Medium Frequency (3cpd). The CDS and Chi results only confirm our study further. Conclusively, the study suggests that members of the non-clinical population do experience a certain level of increase in cortical hyper-excitability. It establishes the utility of pattern glare with regards to CHi and CDS to add to our existing knowledge.
creator: Nishtha Bakshi
source: Introduction The major objective of this study is to understand the relationship between the cortical hyper-excitability and the various visual hallucinations or distortions in the non-clinical population. The major research question is to understand how the aberrant neural processes lead to anomalous experiences. This section investigates into the methodology that has been used to investigate and validate hypotheses postulated by the research question of this project. The participants for this study are 48 non-clinical constituents. These participants were tested with the Pattern Glare Task, the Cortical Hyper-Excitability Index and the Cambridge Depersonalization Scale. Participants Forty-eight numbers of individuals, undergraduates and postgraduates ageing between 21 and 33 from were recruited for the experiment via random sampling. The mean age of the participants was 24. Out of these, 30 (62%) were male participants while 18 (38 %) were the number of female participants. None of the individuals reported any medical history of seizures, photo sensory epilepsy or were diagnosed with migraine. Individuals suffering from migraine, migraine (aura) or photosensitive epilepsy were excluded from the study. Materials Pattern Glare Test The pattern glare task includes stripy patterns on three separate cards each with different spatial frequencies; low spatial frequency baseline grating (approx. 0.5 cycles per degree), high spatial frequency baseline grating (approx. 12 cpd), and the crucial medium spatial frequency grating (approx. 3 cpd). The computerised version of the pattern glare task was modified for this experiment, as we were using a paper-based version (Wilkins, 1995; Wilkins et al., 1984) for the same. The stimuli used in the experiment are given in Figure 1. The individuals are asked to stare at the white dot in the center of each pattern for approximately 10-15 seconds, while holding each pattern at arm's length. Following, a series of questions are asked to …
publisher: Lancaster University
date: 2018
contributor: Ellie Ball
rights: Open
relation: None
format: data/Excel.csv
language: English
type: Data
coverage: LA1 4YF

Could eye movements provide a window into early signs of dementia? Investigating the relationship between eye movements and cognitive decline.
subject: saccades Alzheimers
description: Past research has indicated a relationship between eye movement abilities and cognitive decline. Specifically, performances on the anti-saccade task and pro-saccade task have demonstrated a correlation with Alzheimer’s disease (AD) severity, suggesting that impairments in visual ability may be a potential biomarker for dementia. However, little research has investigated whether the same deficiency is present in more ecologically valid tasks. The current study therefore aimed to extend the dementia literature by examining eye movement abilities in individuals with AD when completing a task that required the visual exploration of videos. In order to investigate a disease effect, patients with AD were compared to healthy older controls. To explore age effects, the older controls were additionally compared to healthy younger controls. To attempt to replicate previous findings, all groups first completed both the pro-saccade and anti-saccade task, before subsequently completing a video task designed to require similar abilities as those necessitated by the anti-saccade task. The findings revealed clear qualitative differences between the age effect and the disease effect on the anti-saccade task, suggesting that AD is not purely an accelerated form of ageing. Furthermore, the results supported the contemporary literature, in that, patients with AD made more errors, and less corrected errors, on the anti-saccade task. In turn, these results advocate for the utilisation of the task as a biomarker of AD. However, this impairment did not translate to the videos task. These results suggest that certain conditions may be conducive to normal viewing behaviour in patients with AD, and thus may potentially indicate that the natural exploration of videos is not a reliable biomarker for AD.
creator: Jennifer Grayling
source: For all saccade tasks, a repeated measures design was used, with group as the independent variable (AD, OC, and YC). For the PST there were 2 dependent variables: latency and amplitude (see appendix A for definitions). For the AST there were 5 dependent variables latency, amplitude, number of errors, corrected errors percentage, and corrected errors start time (see appendix B for definitions). For the videos a 3(Group: AD, OC, YC) x 2(Instructions: free view, instructed view) mixed design was used, with group as a between-subjects factor and instructions as a within-subjects factor. For each of the videos, dwell time was calculated as the dependent variable. A total of 25 AD, 17 OC and 37 YC completed the video task. Materials Eye tracking apparatus. An EyeLink Desktop 1000 eye-tracker was used at 1000Hz to record eye movements. Participants sat approximately 55cm away from the screen with their head on a chin rest to minimise movement. A 3x3 grid of sequentially appearing dots was used to calibrate participant’s dominant eye with the machine. Pro-saccade task. The PST provides a measure of involuntary responses to visual stimulus. The methods utilised in this study followed previously established procedures (Crawford et al., 2005). In order to centre the participant’s gaze, the trial commenced displaying a central fixation target for 1000 milliseconds. This target then disappeared for 200 milliseconds, before a peripheral target appeared for 2000 milliseconds either to the left or right of the initial central fixation target (at ± 4°). The direction was randomised in order to avoid predictive saccades. The inter-trial interval then took place for 1200 milliseconds. The next trial began when the central fixation point reappeared. The participant’s task was to look at the peripheral target as quickly and accurately as possible (see appendix C). There were 36 trials in total. Anti-saccade task. The AST provides a measure of inhibition. The task format was identical to…
publisher: Lancaster University
date: 2017
contributor: John Towse
rights: Open
relation: This is part of an on-going EPSRC funded MoDEM study approved by the NHS to Dr Crawford
format: data/SPSS.sav
language: English
type: Data
coverage: LA1 4YF

Do foetuses have the ability to retrieve and retain information presented by both the mother-to-be and partner?
subject: language, foetus, mother-to-be, partner, retention
description: The complex phenomenon of language development is a vital criterion for communication and for the strengthening of the attachment bond between caregiver and baby (Chew & Ng, 2021). The period in which humans begin to process speech is difficult to define; previous research has identified that foetuses that have the capacity to retain linguistic information presented to them over six weeks by their mother-to-be show a preference for this information postnatally (DeCasper and Spence, 1986). However, the language environment of the foetus also likely incorporates that of the secondary carer role and very little research has investigated the role of the partner in influencing language retention. This study aims to investigate the extent to which foetuses have the ability to retrieve and retain linguistic input presented to them by both their mother-to-be and their partner. A within-measures design with two participant pairs who were recruited via opportunistic sampling through Lancaster University’s Babylab was conducted. Participants were asked to record themselves reading “The Cat in the Hat” and play both of the recordings to the foetus every day for two weeks. During these sessions, the mother-to-be was required to count the frequency of kicks and the movement intensity per session. The findings concluded that foetuses can retrieve and retain language that is presented over a two-week period at only 32 weeks’ gestation. Foetal kicking decreased significantly as exposure to recordings increased. This provides evidence of online processing of linguistics at 32 weeks’ gestation, implying that the full six-week exposure, as previous research indicated, is not necessary thus providing evidence of an innate processing of language. Although there is scope of environmental influence on this. No significant impact of parent recording on foetal ability to process language was found. This suggests that humans have an innate ability to process linguistic information which is de…
creator: Hope Butler
source: Methods: Ethics Statement: Ethical approval was granted by Lancaster University Psychology Department on the 12th of April 2021 before any data collection was completed. Participants were provided with information for review and asked to complete an informed consent form online before participating within this experiment and were given the option to withdraw at any point of the study. Participants: Three mothers-to-be and their partners were recruited via opportunistic sampling through Lancaster University BabyLab social media (http://wp.lancs.ac.uk/babylab/) and word of mouth in exchange for a £5 book voucher from Waterstones. In order to take part in this research mothers-to-be must live with a partner and also have a foetal gestation age of between 32-34 weeks. If any participants were bilingual, they were asked to record the story in English to ensure reliability. Materials and Measures: Due to current restrictions because of COVID-19, this experiment took place online. Participants were sent an email containing a link to a Qualtrics survey. Qualtrics is a software that allows participants to access surveys and questionnaires on all digital devices at any point of time to help aid easy distribution. Qualtrics Survey: To complete this survey, participants were required to have access to a mobile device or computer. The Survey contained the information sheet, consent form, instructions, and demographic questions. The questionnaire consisted of questions asking the mother-to-be to rate the intensity of movements and state the frequency of kicking per session (see Appendix A). The intensity of kicks were recorded using a scale bar where mothers-to-be could rate the intensity of the kicking per session (0-100). Recording “The Cat in the Hat”: Participants were given a copy of an extract from “The Cat in the Hat” and both the mother- to-be and their Partner were asked to record themselves reading the story aloud using a device that they were then able to play the reco…
publisher: Lancaster University
date: 08/09/2021
contributor: Rebecca James and Livvi Taylor
rights: Open
relation: No Relation
format: data/r.csv
language: English
type: Data
coverage: LA1 4YF

Do trustworthiness judgements help people to recognise synthetic faces?
subject: StyleGAN, synthetic face, trustworthiness perception, facial trustworthiness
description: Recent advances in digital image generative models have allowed for artificial creation of fake imagery such as synthesising highly photorealistic human faces. Style-based Generative Adversarial Networks (StyleGAN) is one of the most state-of-the-art generative models in this field, and has been widely used on facial image generation. However, with the increasing ease of using such image generative models, the security in many domains, such as forensic, border control and mass media, is vulnerable in front of the potential threats resulted from the misuse of image generative technologies. To date there has only been limited empirical research into the facial characteristics of StyleGAN-generated faces to support the design of detection methods against such synthetic faces. This study used StyleGAN2 (an improved version of StyleGAN) to generate faces and invited people to complete two facial image evaluation tasks, 1) Discrimination task, 2) Trustworthiness rating task. The study results demonstrated that, in the discrimination task, subjects had trouble recognising synthetic faces by direct/explicit judgement; while in the trustworthiness rating task, subjects perceived the synthetic faces as significantly more trustworthy than real faces. The study further analysed gender bias and ethnicity bias on the perception of facial trustworthiness, with results showing some differences between different levels of gender and ethnicity. In conclusion, people’s ability to recognise synthetic faces is poor, but it is possible that people rely on the perception of facial trustworthiness to discriminate synthetic from real faces. The findings in this study have implications for the development of detection methods against digitally generated faces.
creator: Haisa Shan
source: Three hundred and fifty-seven subjects (114 males, mean age = 25.2, SD = 5.8; 227 females, mean age = 25.0, SD = 6.3; 10 non-binary, mean age = 23.6, SD = 8.93) were recruited to complete an online survey test delivered on www.qualtrics.com. The responses of subjects who started but did not complete the online survey were eliminated to avoid distorting the research results. We used computer-synthesised facial images in this research as fake faces, mixed with real faces to examine people’s ability to detect fake faces and perceptual differences of trustworthiness between real/fake faces. Subjects did not get rewards for their participation, though they could see the test score of their performances at the end of the survey. The Qualtrics survey was based on a within-subjects design in which all subjects viewed the same two sets of adult facial images and completed each of the two tasks. To eliminate the effect of between-sets difference, the use of each image sets was counterbalanced in the individual test for each subject. Before the survey started, all subjects provided informed consent and completed a demographic questionnaire about their age, gender, ethnicity. In terms of the experimental power of 0.8 and significance level of 0.05, with a small effect, the power calculation indicated that the study needed at least 198 subjects. Stimuli A total of thirty-two human facial images (1024×1024 resolution), including 16 real and 16 synthetic faces, were used as stimuli in the survey. All real faces were taken from a publicly available dataset for high-quality human facial images, Flickr-Faces-HQ (FFHQ), which is created as a benchmark for GAN (see https://github.com/NVlabs/ffhq-dataset), and all synthetic faces were gained from the dataset of the generative image modeling, StyleGAN2 (see https://github.com/NVlabs/stylegan2). To ensure a diverse dataset, in each of the two sets of faces, there were 4 Black, 4 East Asian, 4 South Asian, 4 White, and 2 males and 2 female…
date: 8 September 2021
contributor: Joanne Roe
rights: Open
relation: None
format: data/Excel.csv
language: English
type: Data
identifier: Cognitive, Perception Forensic

Do trustworthiness judgements help people to recognise synthetic faces?
subject: StyleGAN, synthetic face, trustworthiness perception, facial trustworthiness
description: Recent advances in digital image generative models have allowed for artificial creation of fake imagery such as synthesising highly photorealistic human faces. Style-based Generative Adversarial Networks (StyleGAN) is one of the most state-of-the-art generative models in this field, and has been widely used on facial image generation. However, with the increasing ease of using such image generative models, the security in many domains, such as forensic, border control and mass media, is vulnerable in front of the potential threats resulted from the misuse of image generative technologies. To date there has only been limited empirical research into the facial characteristics of StyleGAN-generated faces to support the design of detection methods against such synthetic faces. This study used StyleGAN2 (an improved version of StyleGAN) to generate faces and invited people to complete two facial image evaluation tasks, 1) Discrimination task, 2) Trustworthiness rating task. The study results demonstrated that, in the discrimination task, subjects had trouble recognising synthetic faces by direct/explicit judgement; while in the trustworthiness rating task, subjects perceived the synthetic faces as significantly more trustworthy than real faces. The study further analysed gender bias and ethnicity bias on the perception of facial trustworthiness, with results showing some differences between different levels of gender and ethnicity. In conclusion, people’s ability to recognise synthetic faces is poor, but it is possible that people rely on the perception of facial trustworthiness to discriminate synthetic from real faces. The findings in this study have implications for the development of detection methods against digitally generated faces.
creator: Haisa Shan
source: Subjects and design Three hundred and fifty-seven subjects (114 males, mean age = 25.2, SD = 5.8; 227 females, mean age = 25.0, SD = 6.3; 10 non-binary, mean age = 23.6, SD = 8.93) were recruited to complete an online survey test delivered on www.qualtrics.com. The responses of subjects who started but did not complete the online survey were eliminated to avoid distorting the research results. We used computer-synthesised facial images in this research as fake faces, mixed with real faces to examine people’s ability to detect fake faces and perceptual differences of trustworthiness between real/fake faces. Subjects did not get rewards for their participation, though they could see the test score of their performances at the end of the survey. The Qualtrics survey was based on a within-subjects design in which all subjects viewed the same two sets of adult facial images and completed each of the two tasks. To eliminate the effect of between-sets difference, the use of each image sets was counterbalanced in the individual test for each subject. Before the survey started, all subjects provided informed consent and completed a demographic questionnaire about their age, gender, ethnicity. In terms of the experimental power of 0.8 and significance level of 0.05, with a small effect, the power calculation indicated that the study needed at least 198 subjects. Stimuli A total of thirty-two human facial images (1024×1024 resolution), including 16 real and 16 synthetic faces, were used as stimuli in the survey. All real faces were taken from a publicly available dataset for high-quality human facial images, Flickr-Faces-HQ (FFHQ), which is created as a benchmark for GAN (see https://github.com/NVlabs/ffhq-dataset), and all synthetic faces were gained from the dataset of the generative image modeling, StyleGAN2 (see https://github.com/NVlabs/stylegan2). To ensure a diverse dataset, in each of the two sets of faces, there were 4 Black, 4 East Asian, 4 South Asian, 4 White, and …
publisher: Lancaster University
date: 8 September 2021
contributor: Joanne Roe
rights: Open
relation: None
format: data/Excel.csv
language: English
type: Data
identifier: Cognitive, Perception Forensic
coverage: LA1 4YW