Information seeking by orangutans: a generalized search strategy?

Recent empirical work has suggested that some species of non-human primates may be aware of their knowledge states. One finding to support this claim is that they seek information about the location of a hidden food item when they are unsure of its location, but not when they already know where it is, which purportedly demonstrates metacognition. However, this behaviour may instead reflect a generalized search strategy, in which subjects reach for food when they see it, and search for it when they do not. In this experiment, this possibility was addressed by testing orangutans in three conditions in which the location of a food item was sometimes known to subjects, and other times required subjects to visually seek the missing information. All subjects exhibited behaviour consistent with a metacognitive interpretation in at least two of the three conditions. Critically, in two of the conditions, subjects refrained from seeking visual information, and correctly found the hidden food item without ever seeing it, using inference by exclusion. The results suggest that animals that succeed in this information-seeking task are not merely acting according to a generalized search strategy, and instead seek information adaptively according to their knowledge states.     

Psychometric properties of the youth experience survey with young athletes

Objectives

The topic of positive youth development through sport has received much research attention in recent years. However, a specific tool that measures this construct has yet to be fully developed. The purpose of this study was to test the factor structure of the Youth Experience Survey 2.0 (YES; Hansen & Larson, 2005) in a sample of youth sport participants; an instrument that was originally developed to assess experiences across any type of structured activity.

Design/methods

A total of 637 athletes aged 9-19 years completed the YES. A confirmatory factor analysis was conducted to fit the data to the model. The confirmatory factor analysis did not provide strong support for the models tested that resulted in a re-examination of the data using exploratory analyses. This analysis was preceded by a parallel analysis to determine the number of factors to retain.

Results

Results of exploratory analyses created a modified version of the YES that measures 5 dimensions of youth development (personal and social skills, initiative, goal setting, cognitive skills, and negative experiences). The revised version of the scale, which contains 37 items, was renamed the Youth Experience Survey for Sport (YES-S).

Conclusions

The YES-S is proposed as an instrument capable of measuring positive and negative developmental experiences occurring in the youth sport domain.     

Development and validation of the Fat Talk Questionnaire

Fat talk refers to negative body-related conversations between girls or young women. This research aimed to use qualitative data from young women to guide development of a quantitative fat talk measure. In Study 1, a preliminary 62-item questionnaire was developed and administered to 200 female participants. Item analysis resulted in the elimination of items, yielding a final questionnaire with 14 items. Principal components analysis of this questionnaire indicated a single factor. In Study 2, 95 female participants completed the newly developed Fat Talk Questionnaire and theoretically related (e.g., body image) and unrelated (e.g., social desirability) constructs. Additionally, 49 male participants completed the questionnaire to examine known groups validity. In Study 3, 54 participants completed the Fat Talk Questionnaire on two occasions to assess temporal stability. The results showed that the Fat Talk Questionnaire is reliable and valid. The Fat Talk Questionnaire may have important utility in future research.     

Spectral information for detection of acoustic time to arrival

The exponential increase of intensity for an approaching sound source provides salient information for a listener to make judgments of time to arrival (TTA). Specifically, a listener will experience a greater rate of increasing intensity for higher than for lower frequencies during a sound source’s approach. To examine the relative importance of this spectral information, listeners were asked to make judgments about the arrival times of nine 1-octave-band sound sources (the bands were consecutive, nonoverlapping single octaves, ranging from 40–80 Hz to ~10–20 kHz). As is typical in TTA tasks, listeners tended to underestimate the arrival time of the approaching sound source. In naturally occurring and independently manipulated amplification curves, bands with center frequencies between 120 and 250 Hz caused the least underestimation, and bands with center frequencies between 2000 and 7500 Hz caused the most underestimation. This spectral influence appears to be related to the greater perceived urgency of higher-frequency sounds.     

My people,right or wrong? Minimal group membership disrupts preschoolers’ selective trust

When preschoolers decide to trust one speaker over another, how does group membership influence their tracking of speaker reliability? In Experiment 1, 4-year-olds were assigned to arbitrary groups of no social significance (0055 and 0170) and asked to endorse novel object labels provided by two ingroup members, one of whom was reliable and the second of whom was unreliable. Children selectively trusted the more reliable informant. In Experiment 2, we asked whether ingroup status or reliability would determine children's choices and found that 4-year-olds failed to trust reliable outgroup members over unreliable ingroup members (or vice versa). Experiment 3 showed that the failure of trust in Experiment 2 was not due to the mere inclusion of both ingroup and outgroup members: children presented with a control paradigm in which the ingroup members were reliable trusted reliable ingroup members over unreliable outgroup members. Children's use of reliability as an indicator of future credibility therefore appears disrupted when outgroup status and reliability are in conflict, even when group membership is arbitrary.     

The development of perceptual grouping biases in infancy: A Japanese-English cross-linguistic study

Perceptual grouping has traditionally been thought to be governed by innate, universal principles. However, recent work has found differences in Japanese and English speakers’ non-linguistic perceptual grouping, implicating language in non-linguistic perceptual processes (Iversen, Patel, & Ohgushi, 2008). Two experiments test Japanese- and English-learning infants of 5–6 and 7–8 months of age to explore the development of grouping preferences. At 5–6 months, neither the Japanese nor the English infants revealed any systematic perceptual biases. However, by 7–8 months, the same age as when linguistic phrasal grouping develops, infants developed non-linguistic grouping preferences consistent with their language’s structure (and the grouping biases found in adulthood). These results reveal an early difference in non-linguistic perception between infants growing up in different language environments. The possibility that infants’ linguistic phrasal grouping is bootstrapped by abstract perceptual principles is discussed.     

Sentence processing in an artificial language: Learning and using combinatorial constraints

A study combining artificial grammar and sentence comprehension methods investigated the learning and online use of probabilistic, nonadjacent combinatorial constraints. Participants learned a small artificial language describing cartoon monsters acting on objects. Self-paced reading of sentences in the artificial language revealed comprehenders’ sensitivity to nonadjacent combinatorial constraints, without explicit awareness of the probabilities embedded in the language. These results show that even newly-learned constraints have an identifiable effect on online sentence processing. The rapidity of learning in this paradigm relative to others has implications for theories of implicit learning and its role in language acquisition.     

Trait Self‐Esteem Moderates the Effect of Initiator Status on Emotional and Cognitive Responses to Romantic Relationship Dissolution

ABSTRACT We hypothesized that the effect of initiator status on post breakup distress would vary as a function of trait self‐esteem, such that individuals with low self‐esteem would experience more distress after being rejected by their partners, whereas, among individuals with high self‐esteem, initiator status would not predict distress. We used a prospective design in which university students (N=66) were assessed for emotional responses following the dissolution of their real‐life romantic relationships, as well as a laboratory design in which students (N=190) imagined breaking up with their partners. As predicted, participants with lower trait self‐esteem exhibited greater distress after experiencing or imagining a romantic rejection than after ending or imagining themselves ending their relationships. Conversely, distress experienced by those with high trait self‐esteem did not differ as a function of who ended the relationship. Implications for understanding self‐esteem processes and the effects of romantic rejection are discussed.