Perceptual Bias Research Articles

What factors predict anti‐Black bias in pain perception? An internal meta‐analysis across 40 experimental studies

AbstractRacial disparities in pain care affecting Black Americans are mirrored by a similar perceptual bias: perceivers see pain less readily on Black (vs. White) faces. Here, we examine the findings of the initial wave of research on this phenomenon, described herein as anti‐Black bias in pain perception. Specifically, we conducted an internal meta‐analysis across 40 studies conducted in the U.S. with primarily White samples (N = 6252) assessing the generalizability, robustness, and psychological correlates of anti‐Black bias in pain perception. We also assessed the evidence for accounts of this bias focused on intergroup processes, racialized stereotypes and prejudice, dehumanization, and contact. This meta‐analysis strongly confirms our prior findings. Moreover, anti‐Black bias in pain perception is consistently associated with bias in treatment recommendations. These effects are robust to differences in stimuli, samples, and perceiver gender and race. Notably, both Black and White perceivers demonstrate more conservative perceptual thresholds for seeing pain on Black faces, suggesting this bias is not merely a consequence of group membership. Further, increased dehumanization of and decreased intergroup contact with Black individuals predicts biased pain perception and treatment recommendations, though these effects were small. These results demonstrate the robustness of anti‐Black bias in pain perception and establish a strong foundation for future inquiry.

Body image construction and mental health levels among college students: a data survey of Chinese university students.

With the rapid changes in body image construction brought about by the upgrading of consumption in China, trend-seeking college students are faced with mental health problems brought about by the pursuit of the "ideal body type," which cannot be ignored. This study aims to explore the relationship between body image construction and mental health among college students. This study utilized data from the Survey on Physical Activity and Mental Health of College Students. A total of 1,192 students were randomly selected as the survey sample, and 1,044 valid samples were obtained. The mean age of the respondents was 19.34 years. First, we categorized body image constructs into three categories based on the differences between subjective and objective body image: high acceptance, low acceptance, and consistency. Second, to ensure analytical rigor and minimize potential confounders, we used a generalized propensity score weighting model. Finally, we used a causal mediation framework to investigate the potential causal mechanisms between the independent variable (perceived body image bias) and the dependent variable (mental health) in order to better understand the "net effect." (1) There is a significant correlation between college students' body image perceptual bias and mental health, i.e., the higher the individual's acceptance of his/her own body image, the higher the level of mental health, and vice versa. (2) Students in humanities and social sciences are more likely to have increased psychological burden due to poor negative body image. (3) In the mediation analysis, although the causal mediating effect of physical exercise was not significant, family and peer support in physical exercise played an important mediating role, especially the influence of peers was more significant. The construction of body image is a double-edged sword that can either promote positive individual development or lead to self-depreciation. Creating a positive climate for physical activity has a positive impact on college students' mental health compared to participation in physical activity behaviors. While improving students' media literacy on college campuses, it is important to enhance adaptive guidance to promote their physical and mental health and personal development.

When less is more: coy display behaviours and the temporal dynamics of animal courtship.

Sexual selection research has been dominated by the notion that mate choice selects for the most vigorous displays that best reflect the quality of the courter. However, courtship displays are often temporally structured, containing different elements with varying degrees of intensity and conspicuousness. For example, highly intense movements are often coupled with more subtle components such as static postures or hiding displays. Here, we refer to such subtle display traits as 'coy', as they involve the withholding of information about maximal display capabilities. We examine the role of intensity variation within temporally dynamic displays, and discuss three hypotheses for the evolution of coy courtship behaviours. We first review the threat reduction hypothesis, which points to sexual coercion and sexual autonomy as important facets of sexual selection. We then suggest that variation in display magnitude exploits pre-existing perceptual biases for temporal contrast. Lastly, we propose that information withholding may leverage receivers' predispositions for filling gaps in information-the 'curiosity bias'. Overall, our goal is to draw attention to temporal variation in display magnitude, and to advocate possible scenarios for the evolution of courtship traits that regularly occur below performance maxima. Throughout, we highlight novel directions for empirical and theoretical investigations.

Evaluating Change in Transference, Interpersonal Functioning, and Trust Processes in the Treatment of Borderline Personality Disorder: A Single-Case Study Using Ecological Momentary Assessment.

Transference-focused psychotherapy (TFP) is an empirically supported treatment for borderline personality disorder (BPD) that improves functioning via targeting representations of self affectively relating to others, particularly as evoked in the therapeutic relationship. If change in TFP operates as theorized, then shifts in patterns of "self affectively relating to others" should be observed in the transference prior to shifts in daily relationships. Using ecological momentary assessment (EMA), a patient with BPD rated daily interpersonal events for 2-week periods during 18 months of TFP; at 9 and 18 months these ratings included interactions with the therapist. Results suggest that positive perceptions of her therapist that ran counter to her negatively biased perception in other relationships preceded changes in her perceptions of others. EMA shifts corresponded to improvements in self-reported symptoms, interview-based personality functioning, and therapist assessments. Implications for assimilation of a trusting experience with the therapist as a mechanism of change in TFP are discussed.

Perceptive Biases in Construction Mediation: Evidence and Application of Artificial Intelligence

In light of advancements in big data analysis and artificial intelligence (AI), there are emerging opportunities to harness these technologies to address perceptive biases. This study examines the potential perceptive biases that may arise when construction mediation is quasi-imposed on the disputing parties. This can happen when mediation attempts are stipulated in the construction contract or court-directed. It is argued that, under such circumstances, a negative perception might arise over whether a bona fide mediation can be realised. Concerns include the fairness and timeliness of the process, as well as the practice of opportunistic mediating behaviours. With data collected from practising construction mediation practitioners in Hong Kong, the constructs of Perceptions of Bona Fide Mediation, Quasi-Imposition, and Positive Mediation Outcomes were first developed. Applying partial least square structural equation modelling to the relationship frameworks of the constructs, it was found that quasi-imposition is not as damaging as envisaged as far as having a bona fide mediation and attaining positive mediation outcomes are concerned. Moreover, a negative perception of the fairness and timeliness of the quasi-imposed mediation would jeopardise the integrity of a bona fide mediation. In this regard, utilizing NLP and machine learning algorithms offers a pioneering AI-driven approach to informing mediating parties, as well as reminding mediators to uphold the fairness and timeliness of the process for the purposes of reaching positive mediation outcomes.

Self as a prior: The malleability of Bayesian multisensory integration to social salience.

Our everyday perceptual experiences are grounded in the integration of information within and across our senses. Due to this direct behavioural relevance, cross-modal integration retains a certain degree of contextual flexibility, even to social relevance. However, how social relevance modulates cross-modal integration remains unclear. To investigate possible mechanisms, Experiment 1 tested the principles of audio-visual integration for numerosity estimation by deriving a Bayesian optimal observer model with perceptual prior from empirical data to explain perceptual biases. Such perceptual priors may shift towards locations of high salience in the stimulus space. Our results showed that the tendency to over- or underestimate numerosity, expressed in the frequency and strength of fission and fusion illusions, depended on the actual event numerosity. Experiment 2 replicated the effects of social relevance on multisensory integration from Scheller & Sui, 2022 JEP:HPP, using a lower number of events, thereby favouring the opposite illusion through enhanced influences of the prior. In line with the idea that the self acts like a prior, the more frequently observed illusion (more malleable to prior influences) was modulated by self-relevance. Our findings suggest that the self can influence perception by acting like a prior in cue integration, biasing perceptual estimates towards areas of high self-relevance.

Spatial and temporal trends in Peru's radiocarbon record of middle Holocene foragers

The middle Holocene saw major changes in political and socioeconomic organization in Peru. Still, not all Peruvian groups transitioned to food production or engaged in mound or monument construction, yet we know relatively little about those who maintained a mobile lifestyle centered on foraging. Using GIS and statistical analyses to interrogate a database of radiocarbon dates, we assess the Peruvian record of forager distributions through the middle Holocene. We identify patterns consistent with biases stemming from disproportionate research attention, regional and intrasite sampling methodologies, and taphonomy that may be hampering our study of middle Holocene foragers. Further confounding our understanding of foragers during this period are reports of middle Holocene radiocarbon gaps attributed to population decline across South America in response to climate-induced scarcity of freshwater and other resources. We show, however, that this might also be an artifact of sampling in some cases and argue for both increased archaeological attention to middle Holocene foragers and greater awareness of perceptual biases that might influence research design and, therefore, research attention and outcomes.

Letters away from the looking glass: Developmental trajectory of mirrored and rotated letter processing within words.

Discrimination of reversible mirrored letters (e.g., d and b) poses a challenge when learning to read as it requires overcoming mirror invariance, an evolutionary-old perceptual tendency of processing mirror images as equivalent. The present study investigated when, in reading development, mirror-image discrimination becomes automatic during visual word recognition. The developmental trajectory of masked priming effects was investigated from 2nd to 6th grade and in adults, by manipulating letter type (nonreversible; reversible) and prime condition (control; identity; mirrored; rotated). Standardized identity priming increased along reading development. Beginning readers showed mirror invariance during reversible and nonreversible letter processing. A mirror cost (slower word recognition in mirrored-letter than identity prime condition) was found by 5th-grade but only for reversible letters. By 6th grade, orthographic processing was no longer captive of mirror invariance. A multiple linear regression showed that letter representations, but not phonological processes or age, were a reliable predictor of the rise of mirror-image discrimination in 2nd-4th-graders. The present results suggest a protracted development of automatic mirror-image discrimination during orthographic processing, contingent upon the quality of abstract letter representations. RESEARCH HIGHLIGHTS: We traced the developmental trajectory of mirrored-letter and rotated-letter priming effects (e.g., ibea and ipea as primes of IDEA) in visual word recognition. Beginning readers (2nd-4th-graders) showed mirror invariance and plane-rotation sensitivity in orthographic processing, thus still being susceptible to the perceptual biases in charge in object recognition. A mirror cost was found in 5th-graders but only for reversible letters; orthographic processing was no longer captive of mirror invariance by 6th-grade. The automation of mirror-image discrimination during orthographic processing depends on the quality of letter representations but not on phonological processes or age.

Evidence for a universal association of auditory roughness with musical stability.

We provide evidence that the roughness of chords-a psychoacoustic property resulting from unresolved frequency components-is associated with perceived musical stability (operationalized as finishedness) in participants with differing levels and types of exposure to Western or Western-like music. Three groups of participants were tested in a remote cloud forest region of Papua New Guinea (PNG), and two groups in Sydney, Australia (musicians and non-musicians). Unlike prominent prior studies of consonance/dissonance across cultures, we framed the concept of consonance as stability rather than as pleasantness. We find a negative relationship between roughness and musical stability in every group including the PNG community with minimal experience of musical harmony. The effect of roughness is stronger for the Sydney participants, particularly musicians. We find an effect of harmonicity-a psychoacoustic property resulting from chords having a spectral structure resembling a single pitched tone (such as produced by human vowel sounds)-only in the Sydney musician group, which indicates this feature's effect is mediated via a culture-dependent mechanism. In sum, these results underline the importance of both universal and cultural mechanisms in music cognition, and they suggest powerful implications for understanding the origin of pitch structures in Western tonal music as well as on possibilities for new musical forms that align with humans' perceptual and cognitive biases. They also highlight the importance of how consonance/dissonance is operationalized and explained to participants-particularly those with minimal prior exposure to musical harmony.

Finding a home in or through mobile phones: Access and usage patterns among homeless women in shelter-homes of India

With the number of mobile phone subscribers increasing across all sections of society, this paper aims to understand if homeless women in shelter-homes of India have access to mobile phones and, if so, what are their usage patterns. Facilitated by issues ranging from domestic violence to lack of employment to forced migration and even to human trafficking and rape, women residing in the shelter-homes of India have a myriad of stories to tell. Not all of them have been on streets forever and many have the basic literacy to understand how to use a mobile phone. For the purposes of the study, the researchers engaged with women above 18 years of age up to the age of 45 in a series of open-ended interviews to understand their access to mobile phones and contextualize their homelessness within an affordances-based framework for mobile phone access. This paper takes into account the dual barriers of gender and the lack of a home to study the digital divide experienced by homeless women in India, expanding on how both these factors shape their access and usage, eventually bridging the digital divide, and whether mobile phones are required/desired by the women themselves. The study found that the women staying in shelter-homes see a window of hope in their use of mobile phones in the form of an independent financial future or an independent marital life, but the biased perception of using a mobile phone among women hinders women’s access to and use of these devices, which ultimately results in the loss of any kind of opportunity before it has even been explored, perhaps leading to the loss of a chance at a bright future.

Studying perceptual bias in favor of the from-above Necker cube perspective in a goal-directed behavior.

When viewing a completely ambiguous image, different interpretations can switch involuntarily due to internal top-down processing. In the case of the Necker cube, an entirely ambiguous stimulus, observers often display a bias in perceptual switching between two interpretations based on their perspectives: one with a from-above perspective (FA) and the other with a from-below perspective (FB). Typically, observers exhibit a priori top-down bias in favor of the FA interpretation, which may stem from a statistical tendency in everyday life where we more frequently observe objects from above. However, it remains unclear whether this perceptual bias persists when individuals voluntarily decide on the Necker cube's interpretation in goal-directed behavior, and the impact of ambiguity in this context is not well-understood. In our study, we instructed observers to voluntarily identify the orientation of a Necker cube while manipulating its ambiguity from low (LA) to high (HA). Our investigation aimed to test two hypotheses: (i) whether the perspective (FA or FB) would result in a bias in response time, and (ii) whether this bias would depend on the level of stimulus ambiguity. Additionally, we analyzed electroencephalogram (EEG) signals to identify potential biomarkers that could explain the observed perceptual bias. The behavioral results confirmed a perceptual bias in favor of the from-above perspective, as indicated by shorter response times. However, this bias diminished for stimuli with high ambiguity. For the LA stimuli, the occipital theta-band power consistently exceeded the frontal theta-band power throughout most of the decision-making time. In contrast, for the HA stimuli, the frontal theta-band power started to exceed the occipital theta-band power during the 0.3-s period preceding the decision. We propose that occipital theta-band power reflects evidence accumulation, while frontal theta-band power reflects its evaluation and decision-making processes. For the FB perspective, occipital theta-band power exhibited higher values and dominated over a longer duration, leading to an overall increase in response time. These results suggest that more information and more time are needed to encode stimuli with a FB perspective, as this template is less common for the observers compared to the template for a cube with a FA perspective.

Attention-based deep learning model to improving multi-criteria decision-making for customer loyalty

Understanding the factors that influence product loyalty is crucial for businesses to effectively attract and retain customers. This study suggests a novel approach to assess the importance and weight of criteria that lead to product loyalty by considering the Halo effect in customer decision-making. The suggested method utilizes an attention-based deep learning model to analyze customer feedback collected through the Net Promoter Score (NPS) scale, incorporating the insights of a large number of customers. The proposed method overcomes the limitations of traditional methods that rely on expert judgments or data mining, providing a more comprehensive and customer-centric perspective. By considering the Halo effect, which can lead to biased perceptions of product features, the method offers a more accurate assessment of criteria weights and their impact on product loyalty. A case study focusing on mobile phone selection and loyalty is conducted to explain the applicability and efficiency of the suggested method. The outcomes are compared with the NPS index and several common multi-criteria decision-making (MCDM) techniques. The findings highlight the superiority of the suggested method in capturing the complex relationships between criteria and product loyalty, surpassing the limitations of expert-based approaches and outperforming traditional MCDM methods. The suggested technique provides valuable insights for companies seeking to enhance customer loyalty and optimize product development strategies. However, it is important to acknowledge limitations related to the reliance on customer feedback and the contextual specificity of the results.

Partisanship predicts COVID-19 vaccine brand preference: the case of Argentina

The COVID-19 pandemic underscored the significance of overcoming vaccine adoption resistance and addressing real and perceived barriers for efficient vaccination campaigns. One major problem faced by health systems around the world was that people’s preferences for a specific brand of vaccine often delayed vaccination efforts as people canceled or delayed appointments to receive their preferred brand. Therefore, in the event of another pandemic, it is important to know which factors influence preferences for specific vaccine brands. Previous literature showed that consumers choose products that are congruent with their self-concept, which includes their political affiliation. Given that the discourse around vaccine brands has been strongly politicized during the pandemic, in our work, we test whether partisanship influences preferences for COVID-19 vaccine brands. To test this, we collected survey data from Argentina (N = 432), a country with a clear bi-partisan structure and where a variety of vaccine brands were administered, both from Western and Eastern laboratories. We found that supporters of the ruling party, which had strong ties with Eastern countries such as Russia and China, perceived Eastern vaccine brands (e.g., Sputnik V) to be more effective and safer than Western ones (e.g., Pfizer) whereas the contrary was true for supporters of the opposition. Our results also showed that supporters of the opposing party were more likely to wish to hypothetically switch vaccines, to delay their appointment in case of not receiving their preferred brand, and to disapprove of their local vaccination campaign. Our results demonstrate that political party affiliation biases perceptions of both vaccine brands’ quality and vaccination campaign effectiveness. We anticipate that our results can inform public policy strategies when it comes to an efficient vaccine supply allocation, as political affiliation is a measurable and predictable consumer trait.

Masculinity Crisis or Intergenerational Perceptual Biases? Explicating Public Acquiescence to the Media Regulation on Effeminate Masculinity

Abstract By drawing on the perspective of the third-person effect (TPE), this study explains Chinese men’s general acquiescence to the nation’s recent media regulation on effeminate masculinity. Data were collected among Chinese male netizens through an online cross-sectional survey (N = 735) and processed using a paired samples t-test, regression analysis, and mediation test. The statistical results demonstrate that public silence is not based on their perception of a masculinity crisis but rather a generation gap in self-other perceptual biases that conceive the younger generation as more susceptible to the influence of effeminate male media figures. Furthermore, the study found that media exposure, perceived desirability, critical media literacy, and gender ideology significantly predicted respondents’ related perceptions through the mediation of social distance. While frequent media exposure and positive media portrayals have demonstrated a potential for reducing prejudice against nonconventional gender performances, the recent official restriction on effeminate masculinity may perpetuate this prejudice. Overall, this study enriches the literature on the TPE by comparing intergenerational differences in perceptual biases regarding the social implications of media portrayals of effeminate masculinity.

Technology Services Perception and Behavioral biases of Promotion in Consumer paradox towards Generation Z: Evidence from Emerging Market

Technology Services Perception and Behavioral biases of Promotion in Consumer paradox towards Generation Z: Evidence from Emerging Market

We Dislike Them, so They Lie: Partisan Bias in Perception of Accuracy of Factual Claims

The aim of this paper is to investigate how and to what extent partisan bias affects the perceived accuracy of factual claims made by politicians in Slovakia. In our research, respondents (N = 122) were asked to create their own ranking of the credibility of politicians. The respondents were later asked to estimate the average factual accuracy of the most trusted, moderately trusted, and least trusted politicians. Data from the non-partisan fact-check project Demagog.SK was used as the baseline data for testing the actual factual accuracy of politicians. This survey experiment also tests the effect of anchoring. The results suggest no positive partisan bias, and, hence, the absence of partisan favoritism. The study shows that people tend to believe that politicians use of false claims disproportionately more often than in reality

Social and sexual consequences of facial femininity in a non-human primate

In humans, femininity shapes women's interactions with both genders, but its influence on animals remains unknown. Using 10 years of data on a wild primate, we developed an artificial intelligence-based method to estimate facial femininity from naturalistic portraits. Our method explains up to 30% of the variance in perceived femininity in humans, competing with classical methods using standardized pictures taken under laboratory conditions. We then showed that femininity estimated on 95 female mandrills significantly correlated with various socio-sexual behaviors. Unexpectedly, less feminine female mandrills were approached and aggressed more frequently by both sexes and received more male copulations, suggesting a positive valuation of masculinity attributes rather than a perception bias. This study contributes to understand the role of femininity on animal's sociality and offers a framework for non-invasive research on visual communication in behavioral ecology.

When feeling is for seeing: comparing the effects of motivated perception between fear and anger on ambiguous threatening stimuli.

We do not see the world as it is: distortions of visual perception can occur depending on the goals we wish to achieve ("wishful seeing"). Following functionalist theories of emotions (e.g., "feeling is for doing"), visual perception biases could also be involved in the link between emotion and specific behavior. Previous research has shown that anger can modify visual perception towards ambiguous menacing stimuli, or that fear can similarly direct our attention and perception towards threatening stimuli (e.g., weapons). The aim of our research was to replicate these effects by directly comparing the effects of these two emotions on perceptual biases and by relying on general mixed models to control Type I errors and reduce the risk related to the non-independence between observations. Our results partially replicate a perceptual bias toward threatening objects for both emotions although this effect depends on the type of stimulus and of the emotional dimension involved. These results are discussed in terms of the impact of emotions in attentional and perceptual processes and in relation to alternative theoretical explanations for motivated perception.

Supplemental Material for Racial Bias in Perceptions of Children’s Pain

Supplemental Material for Racial Bias in Perceptions of Children’s Pain

Social norms shape visual appearance: Taking a closer look at the link between social norm learning and perceptual decision-making

One of the most fundamental questions in social psychology is whether norms can change individuals' minds by shaping the visual appearance of stimuli. This question was first raised by Muzafer Sherif (1935). Drawing on the extended social reinforcement account (Germar and Mojzisch, 2019), we aimed to provide a rigorous test of the hypothesis that norm learning leads to a persistent perceptual bias and, hence, to a change in the visual appearance of stimuli. From a methodological perspective, we used both a diffusion model approach and the method of adjustment, a well-established technique from psychophysics and vision research. The results of Experiments 1–3 show that norm effects on perceptual decision-making are robustly replicable, and are due to genuine social influence, that is, they cannot be explained by non-social priming, contingency learning effects (Experiments 1 and 2) or anchoring effects (Experiment 3). Most importantly, by using a psychophysical approach, Experiment 4 shows, for the first time, that social norm learning alters individuals' point of subjective equality and, hence, the visual appearance of stimuli.