Visual search in divided areas: Dividers initially interfere with and later facilitate visual search

A common search paradigm requires observers to search for a target among undivided spatial arrays of many items. Yet our visual environment is populated with items that are typically arranged within smaller (subdivided) spatial areas outlined by dividers (e.g., frames). It remains unclear how dividers impact visual search performance. In this study, we manipulated the presence and absence of frames and the number of frames subdividing search displays. Observers searched for a target O among Cs, a typically inefficient search task, and for a target C among Os, a typically efficient search. The results indicated that the presence of divider frames in a search display initially interferes with visual search tasks when targets are quickly detected (i.e., efficient search), leading to early interference; conversely, frames later facilitate visual search in tasks in which targets take longer to detect (i.e., inefficient search), leading to late facilitation. Such interference and facilitation appear only for conditions with a specific number of frames. Relative to previous studies of grouping (due to item proximity or similarity), these findings suggest that frame enclosures of multiple items may induce a grouping effect that influences search performance.     

Female Shamanism and the Mapuche Transformation into Christian Chilean Farmers

This article examines the emergence of a new form of shamanism among the Mapuche of Chile during their first decades under the dominion of the Chilean state. Specifically, it links the emergence of a female shamanism with the policies implemented by the Chilean government and the Catholic Church to integrate the Mapuche into the Chilean society as Christian farmers. The material of this paper is based on historical material from 1881 to 1930.     

Female Shamanism and the Mapuche Transformation into Christian Chilean Farmers

This article examines the emergence of a new form of shamanism among the Mapuche of Chile during their first decades under the dominion of the Chilean state. Specifically, it links the emergence of a female shamanism with the policies implemented by the Chilean government and the Catholic Church to integrate the Mapuche into the Chilean society as Christian farmers. The material of this paper is based on historical material from 1881 to 1930.     

Creep strengthening by lath boundaries in 9Cr ferritic heat-resistant steel

The interactions between dislocations and lath boundaries in Grade 91 steel were observed by an in situ transmission electron microscopy tensile test at 973 K. Dislocations glided slowly and bowed out in a martensite lath interior. The ends of the dislocation were connected to the lath boundaries. In a tempered specimen, the pinning stress caused by the lath boundary was estimated to be >70 MPa with a lath width of 0.4 μm. In crept specimens, lath coarsening reduced the pinning effect.     

Effect of peripherally administered lipopolysaccharide (LPS) on GTP cyclohydrolase I, tetrahydrobiopterin and norepinephrine in the locus coeruleus in mice

Lipopolysaccharide (LPS), an endotoxin released from the outer membranes of Gram-negative bacteria, triggers cells to synthesize and release inflammatory cytokines that may progress to septic shock in vivo. We found that LPS enhances tetrahydrobiopterin (BH4) biosynthesis by inducing the biosynthetic enzyme GTP cyclohydrolase I (GCH) in vitro in the mouse neuroblastoma cell line N1E-115. Furthermore, we observed that gene expression of GCH in the locus coeruleus (LC) in mice was enhanced by peripheral administration of LPS, resulting in increased concentrations of BH4, and norepinephrine, and its metabolite 4-hydroxy-3-methoxyphenylglycol (MHPG). These results suggest that tyrosine hydroxylase (TH) activity is increased by increased content of BH4 due to enhanced mRNA expression of GCH in the LC resulting in the increase in norepinephrine in the LC during endotoxemia. LPS in blood may act as a stressor to increase norepinephrine biosynthesis in the mouse LC.     

From ugly duckling to swan?: Japanese and American beliefs about the stability and origins of traits

Two studies compared the development of beliefs about the stability and origins of physical and psychological traits in Japan and the United States in three age groups: 5–6-year-olds, 8–10-year-olds, and college students. The youngest children in both cultures were the most optimistic about negative traits changing in a positive direction over development and being maintained over the aging period. The belief that individual differences in traits are inborn increased with age, and in all age groups, this belief was related to predictions of greater trait stability. In both cultures, all ages believed positive traits would be maintained over development. In addition to developmental similarities across cultures, cultural variations, consistent with the hypothesis that interdependent cultures have a more incremental view of traits, were present. Japanese participants were more optimistic than American participants about negative traits changing towards the positive and were more likely to attribute differences in trait expression to effort.     

Effect of self‐construal and threat to self‐esteem on ingroup favouritism: Moderating effect of independent/interdependent self‐construal on use of ingroup favouritism for maintaining and enhancing self‐evaluation

The present study examined the hypothesis that in situations that threaten self‐esteem, people with independent self‐construal show more ingroup favouritism, whereas people with interdependent self‐construal do not. Using a minimal group paradigm, consistent with the hypothesis, the results showed that self‐construal and threats to self‐esteem have an interactive effect on ingroup favouritism. Individuals with independent self‐construal showed more ingroup favouritism when their self‐esteem was threatened than when it was not threatened, whereas individuals with interdependent self‐construal exhibited less ingroup favouritism when their self‐esteem was threatened than when it was not threatened. These findings suggest that independent/interdependent self‐construal moderates the use of ingroup favouritism for maintaining and enhancing self‐evaluation.     

Measurement of social dominance in squirrel monkeys

Several laboratory methods for measuring social dominance in squirrel monkeys are described.     

To see dynamic change: continuous focused attention facilitates change detection,but the effect persists briefly

What is the role of continuously focused attention on an object in change detection? To ensure focused attention on one object, we conducted a single object change detection task, manipulating an object’s location between pre-change and post-change displays (same or different location), and also manipulating a blank duration (the FOD task) and a pre-change object presentation duration (the FBD task). If attention is continuously focused at the spatial location of the pre-change object, a location shift of the post-change object should interrupt change detection due to a cognitive cost of attentional shift. Results suggest attention is focused continuously for a brief blank duration, and attention can facilitate the detection of change occurring at the location of attentional focus. Additionally, although attention is focused continuously for a long time if a target is visible, the effect of attention declines with time. The results clarify the new temporal characteristics of focused attention.