A framework for Bayesian optimality of psychophysical laws

The Weber–Fechner law states that perceived intensity is proportional to physical stimuli on a logarithmic scale. In this work, we formulate a Bayesian framework for the scaling of perception and find logarithmic and related scalings are optimal under expected relative error fidelity. Therefore, the Weber–Fechner law arises as being information theoretically efficient under the constraint of limited representability. An even stronger connection is drawn between the Weber–Fechner law and a Bayesian framework when neural storage or communication is the dominant concern, such as for numerosity. Theoretical results and experimental verification for perception of sound intensity are both presented.     

Evidence for a magnitude effect in temporal discounting with pigeons

A magnitude effect in human intertemporal choice is well established-larger rewards or outcomes are discounted over time at a lower rate than are smaller rewards. However, many recent studies have failed to find a corresponding effect in nonhuman animals. Here we report a magnitude effect in temporal discounting for pigeons' choices involving a tradeoff between reward delay and amount. Pigeons chose between a small reward (1-s access to food) after a 2-s delay, and a large reward (4.5-s access to food) after a 28-s delay. Across conditions, the delays to the small and large rewards were increased or decreased, respectively. Temporal discounting functions obtained through a value-estimation procedure showed clear evidence of a magnitude effect: The value of the large reward decreased more slowly with increasing delay than the value of the small reward. We linked this result to a nonlinear relationship between choice and the delays associated with the small and large rewards. The nonlinearity was contrary to the generalized matching law but was predicted by the contextual choice model. Our results confirm the existence of a magnitude effect in nonhuman temporal discounting, showing that this adaptation is not unique to humans.     

Exploratory and confirmatory factor analyses of the Asian American Racism-Related Stress Inventory

The authors conducted exploratory and confirmatory factor analyses of the Asian American Racism-Related Stress Inventory (AARRSI) to further examine the underlying factor structure in a total sample of 1,273 Asian American participants. In the first step of analysis, an exploratory factor analysis with 651 participants yielded a 13-item two-factor solution to the data. In the second step, a confirmatory factor analysis with 622 participants supported both the 13-item two-factor model and the original 29-item three-factor model in the cross-validation sample and generational and ethnicity analyses. The two-factor and three-factor models produced internal consistency estimates ranging from .81 to .95. In addition, the authors examined convergent and criterion related evidence for 13-item and 29-item versions of the AARRSI. Given its brief nature and generally good fit across generational status and ethnicity, the authors suggest that the 13-item AARRSI might be advantageous for research and assessment endeavors.     

Angiotensin-(1-7)/Mas axis integrity is required for the expression of object recognition memory

It has been shown that the brain has its own intrinsic renin-angiotensin system (RAS) and angiotensin-(1-7) (Ang-(1-7)) is particularly interesting, because it appears to counterbalance most of the Ang II effects. Ang-(1-7) exerts its biological function through activation of the G-protein-coupled receptor Mas. Interestingly, hippocampus is one of the regions with higher expression of Mas. However, the role of Ang-(1-7)/Mas axis in hippocampus-dependent memories is still poorly understood. Here we demonstrated that Mas ablation, as well as the blockade of Mas in the CA1-hippocampus, impaired object recognition memory (ORM). We also demonstrated that the blockade of Ang II receptors AT1, but not AT2, recovers ORM impairment of Mas-deficient mice. Considering that high concentrations of Ang-(1-7) may activate AT1 receptors, nonspecifically, we evaluate the levels of Ang-(1-7) and its main precursors Ang I and Ang II in the hippocampus of Mas-deficient mice. The Ang I and Ang II levels are unaltered in the whole hipocampus of MasKo. However, Ang-(1-7) concentration is increased in the whole hippocampus of MasKo mice, as well as in the CA1 area. Taken together, our findings suggest that the functionality of the Ang-(1-7)/Mas axis is essential for normal ORM processing.     

Spatial and temporal task characteristics as stress: a test of the dynamic adaptability theory of stress, workload, and performance

The goal for this study was to test assertions of the dynamic adaptability theory of stress, which proposes two fundamental task dimensions, information rate (temporal properties of a task) and information structure (spatial properties of a task). The theory predicts adaptive stability across stress magnitudes, with progressive and precipitous changes in adaptive response manifesting first as increases in perceived workload and stress and then as performance failure. Information structure was manipulated by varying the number of displays to be monitored (1, 2, 4 or 8 displays). Information rate was manipulated by varying stimulus presentation rate (8, 12, 16, or 20 events/min). A signal detection task was used in which critical signals were pairs of digits that differed by 0 or 1. Performance accuracy declined and workload and stress increased as a function of increased task demand, with a precipitous decline in accuracy at the highest demand levels. However, the form of performance change as well as the pattern of relationships between speed and accuracy and between performance and workload/stress indicates that some aspects of the theory need revision. Implications of the results for the theory and for future research are discussed.     

Mothers of transgender youth experience stigma-by-association

The current research investigated whether mothers of transgender youth experience stigma-by-association. Mturk participants (N = 489) were randomly assigned to read a vignette about a family in which the social identity (transgender, gay/lesbian, cisgender/heterosexual control) and gender (girl, boy) of a child was manipulated, while all other information was held constant. Results revealed stigma targeting mothers as a function of children's social identity (but not gender), such that mothers of transgender girls and boys were viewed substantially more negatively than identical mothers of cisgender/heterosexual youth. Moreover, this stigma was particularly robust among politically conservative participants. In contrast, mothers of gay/lesbian youth did not encounter systematic stigma, though they were sometimes perceived more negatively than mothers of cisgender/heterosexual youth. Results provide novel experimental evidence of stigma-by-association targeting mothers of transgender youth and raise serious concerns about the treatment of parents who seek to affirm their transgender children.     

Encounters at the Religious Edge: Variation in Religious Expression Across Interfaith Advocacy and Social Movement Settings

In a time of increasing religious diversity, interfaith political coalitions have become important settings for interreligious interaction, but little research has explored the types of religious expression that are generated therein. Prevailing theories in the sociology of religion indicate that interaction with religious others results in dilution of traditional religious commitments or production of stronger boundaries. But emerging perspectives in cultural sociology shift attention from individual religious commitments to the ways in which settings shape different styles of religious expression. Insights about edge spaces drawn from urban theory suggest that religiously diverse settings can be generative of new types of religious practices. We apply these insights to the study of interfaith activism by drawing on interviews and ethnographic fieldwork with religious advocacy professionals and activists working in interfaith coalitions. Conceptualizing the sites of these interfaith encounters as edge spaces, we analyze variation in the types of religious expression that occur in interfaith settings. We find that both aggregative and integrative practices are produced, but these vary depending on the goals and structure of the setting, as well as participants’ accountability to outside religious gatekeepers.     

Visual perspective taking by dogs (Canis familiaris) in a Guesser–Knower task: evidence for a canine theory of mind?

We tested domestic dogs (N = 16) in a Guesser–Knower task in which they chose between possible locations for hidden food indicated by human informants. In four experiments, the perceptual access of the Guesser and Knower to the hidden food baiting was manipulated. When informants had differing perceptual access to the baiting, dogs preferred the location indicated by the Knower from the start of testing (Experiment 1), even when baiting was done by a third experimenter (Experiments 2–3). However, when there was no difference in perceptual access and both informants either knew or did not know the food location, dogs had no preference between the informants (Experiment 4). Controls ruled out alternative explanations in terms of associative learning, unintentional and olfactory cues. Analysis of individual data showed no significant heterogeneity across dogs, and results were not correlated with age or sex. Dogs’ performances were superior to those of nonhuman primates in previous studies. Although a mentalistic explanation is not required, results add to evidence that dogs have a remarkable sensitivity to cues related to humans’ attentional state, which enables them to respond as if they had a functional theory of mind in the Guesser–Knower task with human informants.     

Trainee nondisclosure in supervision: What are they not telling you?

Aims: The purposes of this study were to examine: (1) the content of and reasons for trainee nondisclosure in supervision, and (2) the influence of trainee anxiety and perception of the supervisory working alliance on amount of nondisclosure and willingness to disclose. Method: As the focus of the study was a single supervision session, qualitative and quantitative data were collected from 204 trainees about their most recent supervision session. Results: Within the single supervision session on which they reported, 84.3% of trainees withheld information from their supervisors. Trainees reported an average of 2.68 nondisclosures occurring in the session, with the most common nondisclosure involving a negative supervision experience. Trainee perception of a better supervisory working alliance was related to less nondisclosure and greater overall willingness to disclose in supervision. Higher trainee anxiety was related to greater nondisclosure and lower overall willingness to disclose in supervision. Implications: The implications of the findings for the practice of supervision are discussed and areas for further research are suggested.