Examining Own-Race Bias: A Cooperation and Memory Study Using Diverse Emojis

Other-race-effect or own-race bias is a well-documented phenomenon in memory. Findings suggest that humans are better at recognizing and remembering faces of their own race than other races. Previous research suggests that these results are due to a lack of interracial contact or exposure to other racial groups. Evidence from previous studies has demonstrated that individuals process own-race faces differently than other-race faces, paying more attention to more salient features that become better encoded. While there is empirical support for both hypotheses, it has yet to be studied if the other-race effect for memory extends to representational human faces, for instance, emojis. Emojis are digital pictures used for electronic communication of emotions, expressions, and meaning. The current study examined if the other-race effect for recognition memory extended to people emojis. Black (n = 47) and White (n = 47) participants viewed both light/medium-light skin tone and dark/medium-dark skin tone emojis. Participants completed a cooperation task and a memory computer task. Results indicated that there was no difference in memory or cooperation for same-race or other-race faces. However, Black participants that held their racial identity in more positive regard were marginally more likely to remember dark and medium-dark emoji faces. Additionally, Black participants that were more satisfied with their skin color were significantly more likely to remember dark and medium-dark emoji faces. Overall, participants cooperated significantly more with emoji faces than human faces. White participants higher in empathy were marginally more likely to cooperate with Black and dark/medium-dark partners than those lower in empathy. These results suggest that individual differences can moderate own-race bias even for emoji faces

Tactile Modulation of the Sensory and Cortical Responses Elicited by Focal Cooling in Humans and Mice

Distinct sensory receptors transduce thermal and mechanical energies, but we have unified, coherent thermotactile experiences of the objects we touch. These experiences must emerge from the interaction of thermal and tactile signals within the nervous system. How do thermal and mechanical signals modify each other as they interact along the pathway from skin to conscious experience? In this thesis, we study how mechanical touch modulates cooling responses by combining psychophysics in humans and neural recordings in rodents. For this, we developed a novel stimulator to deliver focal, temperature-controlled cooling without touch. First, we used this method to study in humans the sensitivity to focal cooling with and without touch. We found that touch reduces the sensitivity to near-threshold cooling, which is perhaps analogous to the well-established ‘gating’ of pain by touch. Second, we studied the perceived intensity of cooling with and without touch. We found that tactile input enhances the perceived intensity of cooling. Third, we measured the responses of the mouse primary somatosensory cortex to cooling and mechanical stimuli using imaging and electrophysiological methods. We found multisensory stimuli elicited non-linear cortical responses at both the population and cellular level. Altogether, in this thesis, we show perceptual and cortical responses to non-tactile cooling for the first time. Based on our observations, we propose a new model to explain the interactions between cooling and mechanical signals in the nervous system. This thesis advances our understanding of how touch modulates cold sensations during thermotactile stimulation

The Influence of Phenotypic Variation on Criminal Judgement

The purpose of this study was to investigate the influence of phenotypic variation on criminal judgment. This study had two phases. In the first phase, participants rated multiple headshot photographs on the degree to which African American men possess pronounced Afrocentric features (fuller lips, broader nose, curlier hair, darker skin, etc.). The race of the participants predicted 34.2% of the variance in average skin color ratings above all other variables. White participants rated the Black faces as darker than any other participants rated the same faces. Researchers used the faces rated least, average, and most prototypical of Blacks as the targets for a criminal vignette in phase two. Controlling for participant political ideology and race, target Black prototypicality had a main effect on recommended years for the defendant to serve (Ruby & Brigham, 1996). The most prototypical defendant was more likely sentenced to prison time followed by a period of probation and to serve approximately six more years in the adult correction system than the least or average prototypical defendants. Phenotypic variation was a leading factor in the criminal judgment of African American men along with perceptions of the defendant, attitudes towards the legal system and Black people, and social Black 2 contact. These results have implications for understanding the saliency of phenotypic variation on target judgment and reevaluating the criminal legal process

Racial Bias in Judgments of Physical Size and Formidability: From Size to Threat

Black men tend to be stereotyped as threatening and, as a result, may be disproportionately targeted by police even when unarmed. Here, we found evidence that biased perceptions of young Black men\u27s physical size may play a role in this process. The results of 7 studies showed that people have a bias to perceive young Black men as bigger (taller, heavier, more muscular) and more physically threatening (stronger, more capable of harm) than young White men. Both bottom-up cues of racial prototypicality and top-down information about race supported these misperceptions. Furthermore, this racial bias persisted even among a target sample from whom upper-body strength was controlled (suggesting that racial differences in formidability judgments are a product of bias rather than accuracy). Biased formidability judgments in turn promoted participants\u27 justifications of hypothetical use of force against Black suspects of crime. Thus, perceivers appear to integrate multiple pieces of information to ultimately conclude that young Black men are more physically threatening than young White men, believing that they must therefore be controlled using more aggressive measures

Examining the sense of agency in human-computer interaction

Humans are agents, we feel that we control the course of events on our everyday life. This refers to the Sense of Agency (SoA). This experience is not only crucial in our daily life, but also in our interaction with technology. When we manipulate a user interface (e.g., computer, smartphone, etc.), we expect that the system responds to our input commands with feedback, as we desire to feel that we are in charge of the interaction. If this interplay elicits a SoA, then the user will perceive an instinctive feeling of “I am controlling this”. Although research in Human-Computer Interaction (HCI) pursuits the design of intuitive and responsive systems, most of the current studies have been focussed mainly on interaction techniques (e.g., software-hardware) and User Experience (UX) (e.g., comfort, usability, etc.), and very little has been investigated in terms of the SoA i.e., the conscious experience of being in control regarding the interaction. In this thesis, we present an experimental exploration of the role of the SoA in interaction paradigms typical of HCI. After two chapters of introduction and related work, we describe a series of studies that explore agency implication in interaction with systems through human senses such as vision, audio, touch and smell. Chapter 3 explores the SoA in mid-air haptic interaction through touchless actions. Then, Chapter 4 examines agency modulation through smell and its application for olfactory interfaces. Chapter 5 describes two novel timing techniques based on auditory and haptic cues that provide alternative timing methods to the traditional Libet clock. Finally, we conclude with a discussion chapter that highlights the importance of our SoA during interactions with technology as well as the implications of the results found, in the design of user interfaces

Learning empathy through virtual reality : Multiple strategies for training empathy-related abilities using body ownership Illusions in embodied virtual reality

Several disciplines have investigated the interconnected empathic abilities behind the proverb “to walk a mile in someone else’s shoes” to determine how the presence, and absence, of empathy-related phenomena affect prosocial behavior and intergroup relations. Empathy enables us to learn from others’ pain and to know when to offer support. Similarly, virtual reality (VR) appears to allow individuals to step into someone else’s shoes, through a perceptual illusion called embodiment, or the body ownership illusion. Considering these perspectives, we propose a theoretical analysis of different mechanisms of empathic practices in order to define a possible framework for the design of empathic training in VR. This is not intended to be an extensive review of all types of practices, but an exploration of empathy and empathy-related phenomena. Empathy-related training practices are analyzed and categorized. We also identify different variables used by pioneer studies in VR to promote empathy-related responses. Finally, we propose strategies for using embodied VR technology to train specific empathy-related abilities

Redefining Disproportionate Arrest Rates: An Exploratory Quasi-Experiment that Reassesses the Role of Skin Tone

The New York Times reported that Black Lives Matter was the third most-read subject of 2020. These articles brought to the forefront the question of disparity in arrest rates for darker-skinned people. Questioning arrest disparity is understandable because virtually everything known about disproportionate arrest rates has been a guess, and virtually all prior research on disproportionate arrest rates is questionable because of improper benchmarking (the denominator effect). Current research has highlighted the need to switch from demographic data to skin tone data and start over on disproportionate arrest rate research; therefore, this study explored the relationship between skin tone and disproportionate arrest rates. This study also sought to determine which of the three theories surrounding disproportionate arrests is most predictive of disproportionate rates. The current theories are that disproportionate arrests increase as skin tone gets darker (stereotype threat theory), disproportionate rates are different for Black and Brown people (self-categorization theory), or disproportionate rates apply equally across all darker skin colors (social dominance theory). This study used a quantitative exploratory quasi-experimental design using linear spline regression to analyze arrest rates in Alachua County, Florida, before and after the county’s mandate to reduce arrests as much as possible during the COVID-19 pandemic to protect the prison population. The study was exploratory as no previous study has used skin tone analysis to examine arrest disparity. The findings of this study redefines the understanding of the existence and nature of disparities in arrest rates and offer a solid foundation for additional studies about the relationship between disproportionate arrest rates and skin color

When humans become objects: Out-group effects in real and artificial faces

Out-group members are commonly viewed as being less human than in-group members. They are deniedcertain human characteristics and in turn become associated with machines or automata. Specifically, out-groups are attributedless naturally and uniquely human traits, and they are also seen as being less able to experience complex emotions in comparison to the in-group. Such dissociations have been demonstrated with real human faces but in our study, we aimed to test whether similar effects generalize to their artificial versions. Caucasian participants were presented with images of male Caucasian and Indian faces. Their task was to evaluate to what extent naturally and uniquely human traits, as well as primary and secondary emotions, can be attributed to them. In line with previous research, it was found that positive naturally human traits were attributed to a greater degree to the in-group than to the outgroup, applying to both real and artificial faces. Moreover,negative naturally human traits and negative primary emotions were attributed more to the out-group. This indicates a positive bias towards the in-group and subtle out-group derogation. The results extend prior research based on real human faces and show that intergroup processes emerge similarly in response to artificial faces, which may have implications for the fields of computer graphics and animation. That is, even the most realistic face recognized as belonging to an out-group member may convey less humanness than that of an in-group member

The Influence of Perceptual-Motor Variability on the Perception of Action Boundaries for Reaching

Successful interactions within the environment are contingent upon the perceiver’s ability to perceive the maximum extent over which they can perform actions, commonly referred to as action boundaries. Individuals are extremely calibrated to their action boundaries, and the perceptual system can quickly and flexibly recalibrate to changes in the size of action boundaries in the event of physiological and/or environmental changes. However, because even the most basic motor activities are subject to variability over time, the information upon which action boundaries are based must also be subject to variability. In this set of studies, we examined the effect of random and systematic variability in reaching experience on the perception of action boundaries for reaching using virtual reality. Participants were asked to estimate their reachability following experience reaching with either a long virtual arm, short virtual arm, or a virtual arm that varied in size. Overall, we found that individuals tended toward liberal estimates of their reachability; however, individuals can be influenced to be slightly more conservative after a higher percentage of short reaches. Consequently, when anticipating our reaching capability in the event of perceptual motor variability, individuals employ a liberal approach as it would result in the highest number of successful attempts. (PsycInfo Database Record (c) 2020 APA, all rights reserved