The Impact of Face Skin Tone vs. Face Symmetry on Perceived Facial Attractiveness

The purpose of this study was to assess and compare the relative contribution of skin tone and symmetry on judgment of attractiveness regarding female faces. Two hundred and fifteen Mozambican adults were presented with a set of faces, and instructed to rate their degree of attractiveness along a continuous scale. Chi-square, factorial weight analyses and ANOVA were used to analyze the data. Face skin tone had a significant impact on the participants' attractiveness judgment of target faces. However, the target face skin tone contribution to the participants' attractiveness judgment (5% of the total variance) was much weaker than the contribution of the target face symmetry (85% of the total variance). These results imply that skin bleaching, common among Black people across sub-Saharan African countries, is not only dangerous to the health of those who practice it, but it is unlikely to make them appear much more attractive.     

Serial reversal learning in freshwater stingrays (Potamotrygon motoro)

Animal Cognition - Serial reversal learning is considered a reliable approach for the testing of behavioral flexibility, and animals that inhabit fluctuating habitats and different environments are...     

Supervenience of Extrinsic Properties

The aim of this paper is to define a notion of supervenience which can adequately describe the systematic dependence of extrinsic as well as of intrinsic higher-level properties on base-level features. We argue that none of the standard notions of supervenience—the concepts of weak, strong and global supervenience—fulfil this function. The concept of regional supervenience, which is purported to improve on the standard conceptions, turns out to be problematic as well. As a new approach, we develop the notion of property-dependent supervenience. This notion is founded on a criterion of relevance adapting the supervenience base to the considered higher-level properties in a specific way, such that only features which are relevant to the instantiation of the higher-level properties under consideration are taken into account.     

The impact of body-part-naming training on the accuracy of imitative performances in 2- to 3-year-old children

A series of three experiments explored the relationship between 3-year-old children's ability to name target body parts and their untrained matching of target hand-to-body touches. Nine participants, 3 per experiment, were presented with repeated generalized imitation tests in a multiple-baseline procedure, interspersed with step-by-step training that enabled them to (i) tact the target locations on their own and the experimenter's bodies or (ii) respond accurately as listeners to the experimenter's tacts of the target locations. Prompts for on-task naming of target body parts were also provided later in the procedure. In Experiment 1, only tact training followed by listener probes were conducted; in Experiment 2, tacting was trained first and listener behavior second, whereas in Experiment 3 listener training preceded tact training. Both tact and listener training resulted in emergence of naming together with significant and large improvements in the children's matching performances; this was true for each child and across most target gestures. The present series of experiments provides evidence that naming--the most basic form of self-instructional behavior--may be one means of establishing untrained matching as measured in generalized imitation tests. This demonstration has a bearing on our interpretation of imitation reported in the behavior analytic, cognitive developmental, and comparative literature.     

The perception of changing emotion expressions

The utility of recognising emotion expressions for coordinating social interactions is well documented, but less is known about how continuously changing emotion displays are perceived. The nonlinear dynamic systems view of emotions suggests that mixed emotion expressions in the middle of displays of changing expressions may be decoded differently depending on the expression origin. Hysteresis is when an impression (e.g., disgust) persists well after changes in facial expressions that favour an alternative impression (e.g., anger). In expression changes based on photographs (Study 1) and avatar images (Studies 2a-c, 3), we found hystereses particularly in changes between emotions that are perceptually similar (e.g., anger-disgust). We also consistently found uncertainty (neither emotion contributing to the mixed expression was perceived), which was more prevalent in expression sequences than in static images. Uncertainty occurred particularly in changes between emotions that are perceptually dissimilar, such as changes between happiness and negative emotions. This suggests that the perceptual similarity of emotion expressions may determine the extent to which hysteresis and uncertainty occur. Both hysteresis and uncertainty effects support our premise that emotion decoding is state dependent, a characteristic of dynamic systems. We propose avenues to test possible underlying mechanisms.     

Gender Differences in Contextual Predictors of Urban,Early Adolescents' Subjective Well‐Being

Gender differences in predicting subjective well‐being (SWB) were examined in 168 urban adolescents. School satisfaction predicted life satisfaction for boys; for girls, family satisfaction predicted life satisfaction and neighborhood satisfaction predicted negative affect. Self‐esteem predicted positive affect for both genders, but friends satisfaction and ethnic identity failed to predict SWB. Se examinaron las diferencias de género al predecir el bienestar subjetivo (SWB, por sus siglas en inglés) de 168 adolescentes urbanos. La satisfacción escolar predijo la satisfacción vital en los chicos; en las chicas, la satisfacción familiar predijo la satisfacción vital, y la satisfacción en el vecindario predijo los sentimientos negativos. La autoestima predijo sentimientos positivos en ambos géneros, pero la satisfacción con los amigos y la identidad étnica no fueron predictores del SWB.     

The ISI Change phenomenon: When contradicting one stereotype changes another

When a population is perceived to consist of two mutually exclusive and exhaustive groups, the stereotypes that people form of these groups are likely to be interdependent. We predicted that stereotype-incongruent information about members of one group (target group) may then evoke change in the stereotype of another group (alternative group) even in the absence of any stereotype-incongruent information about members of the alternative group. We demonstrated this Indirect Stereotype-Incongruence Induced (ISI) Change phenomenon in two studies using novel groups (Study 1 and 2). The effect occurred when the incongruent information was about a competent target group (changing the stereotype about the less competent alternative group) but not when it was about an incompetent target group (Study 2). The ISI Change phenomenon implies that stereotypes may change even in the absence of directly stereotype-incongruent information.