Quantifying visual field shape for improving accuracy of search performance prediction

The current study calculated a set of 16 shape indices of six subjects (4 men and 2 women, 21-28 years old) for easy and precise quantification of visual lobe shapes using Visual Lobe Measurement System (VILOMS) software. The indices can be used in mathematical models of visual search for better understanding of search behaviour and higher accuracy of search performance prediction. General patterns in the shape indices showed that visual lobes of the subjects were slightly irregular, with low sphericity, a moderately rough boundary, horizontally elongated and slightly asymmetric along both axes. Given the complex relationships among visual lobe area, lobe shape, and search strategy, it seems that a more detailed analysis than hitherto attempted will be necessary. Quantifying lobe shape with the 16 shape indexes is a useful step to performing such analysis.     

Scrub jays (Aphelocoma coerulescens) form integrated memories of the multiple features of caching episodes

Four experiments examined whether food-storing scrub jays remember when and where they cached different foods. The scrub jays cached and recovered perishable and nonperishable foods in visuospatially distinct and trial-unique cache sites. They rapidly learned to avoid searching for foods that had perished by the time of recovery, while continuing to search for the same foods after shorter retention intervals when the foods were still fresh. The temporal control of searching at recovery was also observed when the familiarity of cache sites did not provide any information about the time of caching and when the same food was cached in distinct sites at different times. The authors argue that the jays formed an integrated memory for the location and time of caching of particular foods.     

Interacting Cache memories: evidence for flexible memory use by Western Scrub-Jays (Aphelocoma californica)

When Western Scrub-Jays (Aphelocoma californica) cached and recovered perishable crickets, N. S. Clayton, K. S. Yu, and A. Dickinson (2001) reported that the jays rapidly learned to search for fresh crickets after a 1-day retention interval (RI) between caching and recovery but to avoid searching for perished crickets after a 4-day RI. In the present experiments, the jays generalized their search preference for crickets to intermediate RIs and used novel information about the rate of decay of crickets presented during the RI to reverse these search preferences at recovery. The authors interpret this reversal as evidence that the birds can integrate information about the caching episode with new information presented during the RI.     

When and why does sense of power hinder self-reported helping behavior? Testing a moderated mediation model in Chinese undergraduates

Many studies on power and its influence on pro-social behavior have been conducted with Western samples. Little is known about whether the relevant research findings can be extended to other cultural settings. This study investigates the relationship between sense of power and self-reported helping behavior in Chinese culture. Using a sample of 388 undergraduate students, this study examines a moderated mediation model in which moral identity serves as a moderator and perspective taking serves as a mediator. The results show that sense of power is negatively associated with helping behavior, and this association is mediated by perspective taking. That is, sense of power exerts a negative effect on perspective taking, thereby decreasing people's tendency to help others. In addition, moral identity moderates the direct and indirect effect from sense of power to helping behavior. Specifically, when moral identity is low, sense of power exerts negative effects on perspective taking and helping behavior, but these effects become non-significant when moral identity is high. This study sheds new light on the understanding of sense of power by examining its profound role in influencing pro-social engagement in Eastern cultures. Our findings suggest that powerful people with lower levels of moral identity may be less willing to consider others' thoughts and feelings, and act less helping behavior. While high moral identity may buffer the negative effect of sense of power and enable powerful people to better play a role in promoting social harmony.