An infant chimpanzee (Pan troglodytes) follows human gaze

The ability of non-human primates to follow the gaze of other individuals has recently received much attention in comparative cognition. The aim of the present study was to investigate the emergence of this ability in a chimpanzee infant. The infant was trained to look at one of two objects, which an experimenter indicated by one of four different cue conditions: (1) tapping on the target object with a finger; (2) pointing to the target object with a finger; (3) gazing at the target object with head orientation; or (4) glancing at the target object without head orientation. The subject was given food rewards independently of its responses under the first three conditions, so that its responses to the objects were not influenced by the rewards. The glancing condition was tested occasionally, without any reinforcement. By the age of 13 months, the subject showed reliable following responses to the object that was indicated by the various cues, including glancing alone. Furthermore, additional tests clearly showed that the subject's performance was controlled by the "social" properties of the experimenter-given cues but not by the non-social, local-enhancing peripheral properties. Electronic Publication     

Reaction times and anticipatory skills of karate athletes

Two experiments were conducted to investigate the reaction times (RTs) and anticipation of karate athletes. In Experiment 1, choice RTs and simple RTs were measured with two types of stimuli. One was videotaped scenes of opponent's offensive actions, which simulated the athletes' view in real situations, and the other was static filled circles, or dots. In the choice RT task, participants were required to indicate as soon as possible whether the offensive actions would be aimed at the upper or middle level of their body, or the dot was presented either at a higher or a lower position. In the simple RT task, they were required to respond as soon as possible when the offensive action started from a static display of the opponent's ready stance, or a dot appeared on the display. The results showed significant differences between the karate athletes and the novices in the choice RT task, the difference being more marked for the video stimuli than for the dot stimuli. There was no significant difference in simple RT between the two groups of participants, for either type of stimuli. In Experiment 2, the proportions of correct responses (PCRs) were measured for video stimuli which were cut off at the seventh frame from the onset of the opponent's offensive action. The athletes yielded significantly higher PCRs than the novices. Collectively the results of the two experiments demonstrate the superior anticipatory skills of karate athletes regarding the target area of an opponent's attack (Scott, Williams, & Davids, Studies in perception and action II: Posters presented at the VIIth International conference on Event Perception and Action, Erlbaum, Hillsdale, NJ, 1993, p. 217; Wiiliams & Elliot, Journal of Sport & Exercise Psychology 21 (1999) 362), together with their advantage over novices in non-specific sensory functions (e.g., vertical discrimination).     

Elicitation of spontaneous mirror reversal drawing on the forehead

32 Japanese participants drew symmetrical and asymmetrical letters on their own foreheads. By observing their drawing strokes, it was judged that 29 of them drew symmetric letters in reverse, that is, as if these were viewed from inside the head. However, 14 of these 29 seemed to have noticed their reversed perception because they drew asymmetric letters intentionally reversed so they would appear correct when viewed from outside. Only three participants drew the letters in a normal way irrespective of the letter symmetry.     

Optimum take-off angle in the standing long jump

The aim of this study was to identify and explain the optimum projection angle that maximises the distance achieved in a standing long jump. Five physically active males performed maximum-effort jumps over a wide range of take-off angles, and the jumps were recorded and analysed using a 2-D video analysis procedure. The total jump distance achieved was considered as the sum of three component distances (take-off, flight, and landing), and the dependence of each component distance on the take-off angle was systematically investigated. The flight distance was strongly affected by a decrease in the jumper's take-off speed with increasing take-off angle, and the take-off distance and landing distance steadily decreased with increasing take-off angle due to changes in the jumper's body configuration. The optimum take-off angle for the jumper was the angle at which the three component distances combined to produce the greatest jump distance. Although the calculated optimum take-off angles (19-27 degrees) were lower than the jumpers' preferred take-off angles (31-39 degrees), the loss in jump distance through using a sub-optimum take-off angle was relatively small.     

Left or right,that is the question: use of egocentric frame of reference and the right-eye advantage for understanding gestural signs in bottlenose dolphins (Tursiops truncatus)

Animal Cognition - How do bottlenose dolphins visually perceive the space around them? In particular, what cues do they use as a frame of reference for left–right perception? To address this...     

"Eating lightly" and the self-presentation of femininity

In Experiment 1, male and female subjects were given an opportunity to snack as they participated in a "get-acquainted study" with a same-sex or opposite-sex partner (confederate) whose social desirability was manipulated. Consistent with the hypothesis that women may eat less when motivated to present themselves in a feminine light, female subjects ate significantly less with a desirable male partner than in the remaining three conditions. In contrast, male subjects did not eat more (or less) with a desirable woman, although they did show an overall tendency to eat less with female (vs. male) partners. In Experiment 2, female subjects snacked as they got acquainted with a desirable male partner (confederate). Before this interaction, subjects received feedback indicating that they had either very masculine or very feminine interests. In addition, subjects believed either that their male partner was aware of their gender feedback or that he was unaware. Consistent with predictions derived from Schlenker's (1982) analytic-identity theory of social conduct, subjects in the partner-aware conditions ate less when they had received masculine (vs. feminine) feedback, whereas subjects in the partner-unaware conditions ate less when they had received feminine (vs. masculine) feedback. Implications for understanding eating disorders such as anorexia and bulimia are discussed.     

Attitudes toward rape: Gender and ethnic differences across Asian and Caucasian college students

Previous research has demonstrated that males have a greater tendency to hold erroneous beliefs about rape than females. However, limited cross-cultural studies, particularly of Asians, have been done in this area. The present investigation examined attitudes toward rape victims and belief in rape myths across 302 Asian and Caucasian college students. Subjects were recruited from two college campuses in Orange County, California, and were from predominantly middle-income backgrounds. None of the Caucasian students and a minority (36.25%) of the Asian subjects identified their particular ethnic group(s) of origin. Of the Asian subjects who specified their ethnicity, the majority were of Southeast Asian and Pacific Islander descent. Results indicated significant differences across ethnicity and gender. Asians were more likely to endorse negative attitudes toward rape victims and greater belief in rape myths than their Caucasian counterparts; males endorsed greater negativity toward rape victims and more acceptance of rape myths than did females. Asian subjects who endorsed greater acculturation (Western affiliation) differed significantly from low acculturated subjects on all dependent variables. Results are discussed in regard to cross-cultural differences and gender. Culturally sensitive rape awareness outreach targeting potentially high risk groups, such as Asian college students, is encouraged.This study was in part supported through an Affirmative Action Grant awarded to the first author by the Affirmative Action Faculty Development Program, California State University, Fullerton. Findings of the study were previously presented at the Annual Convention of the American Psychological Association, August 1994, Los Angeles, California. The authors wish to thank the undergraduate and graduate research assistants who served as experimenters.     

The impact of a near-death experience on family relationships

This study explores the influence that a near-death experience (NDE) had on the family relationships of eleven NDErs, based on in-depth interviews. I detail the changes in relationships with extensive quotes providing data on family interactions. Analysis of the adjustments of NDErs within their family relationships reveals that while some families cope well and are positively influenced by an NDE, others may encounter difficulty and cease to function as they previously did. The transformation that NDErs themselves undergo, as well as the attitudes of others toward the NDE and the NDEr, are instrumental in altering NDErs' family relationships.This paper was excerpted and adapted from his seniors honors thesis.