Transfer of signed responses in American Sign Language from vocal English stimuli to physical object stimuli by a chimpanzee (Pan)

A chimpanzee was taught 10 signs of Ameslan (American Sign Language) using only vocal English words as stimuli. The corresponding physical objects were items found in the subject's home environment, and which he frequently encountered during daily activities. Reference was not made to these items during teaching sessions. Each teaching session was followed by a test session in which the objects were silently presented to the subject and the question What that? was signed to him. The subject acquired all 10 signs in response to the English word stimuli and then successfully transferred these signs to their physical object referents during testing.     

Free sorting with stimuli clustered in a multidlmensional attribute space

An experiment was conducted to determine whether Ss leam, without knowledge of results or prior familiarization with the prototypes, to sort histoform stimuli generated by three probablistic rules into categories consistent with these mies. Seven Ss were asked to sort 30 stimuli (10 from each schema population) on each trial. No constraints were placed on the number of categories to be used. A statistic was developed to measure consistency between schema-defined categories and subjeet-defined categories. Four of the seven Ss met the leaming criterion, and demonstrated increasing consistency with the schema-defined categories across trials. In general, more categories than necessary were used to classify the stimuli correctly. The results raise several questions about classification strategies used by Ss in perceptual learning tasks with stimuli generated by probabilistic rules, and indicate the need for further research conceming the variables that influence perceptual category formation.     

The role of social perspective in perceiving the causes of success and failure1

An experiment was conducted to test the hypothesis that observers' causal attributions about an actor's performance at a task would be affected by their social perspective in observing the situation. Observer subjects were either assigned to serve in a role comparable to that of observer-subjects in most actor-observer experiments or were assigned a distinctive role more divergent from the social perspective of the actor. As expected, observers with a similar social perspective to that of the actor made more flattering attributions about the actor's performance than observers with a dissimilar social perspective. We concluded that actor-observer differences in attribution for an actor's performance in any one experiment cannot be taken as definitive evidence either for or against the defensive attribution idea.     

Painfulness decreases the discriminability of electric shock

Two experiments were designed to investigate the relation between the reported painfulness and the discriminability of pairs of electric shocks for which the ratio between the higher and the lower intensity was held constant. In both experiments, subjects first gave category ratings of the painfulness of single shocks in the range 40 to 4.8 mA. Then, in a discrimination experiment, they were required to identify the stronger of a pair of intensities presented in succession. The proportion of correct responses (Experiment 1) or the proportion of area under the receiver operating characteristic (Experiment 2) increased between a low-intensity pairing and a medium-intensity pairing and decreased between a medium-intensity pairing and a high-intensity pairing for subjects who rated the highest intensities as strongly painful. Subjects who gave moderate- or weak-pain ratings for the high-intensity shocks showed no significant increase or decrease in accuracy between the medium- and high-intensity pairings. Time-order errors were observed in Experiment 1. The proportion of trials on which the second stimulus of the pair was identified as the stronger increased monotonically as a function of stimulus magnitude. The results are discussed in the context of psychological assessment of analgesic procedures.     

Landmark Discrimination Learning in the Dog

Allocentric spatial memory was studied in dogs of varying ages and sources using a landmark discrimination task. The primary goal of this study was to develop a protocol to test landmark discrimination learning in the dog. Using a modified version of a landmark test developed for use in monkeys, we successfully trained dogs to make a spatial discrimination on the basis of the position of a visual landmark relative to two identical discriminanda. Task performance decreased, however, as the distance between the landmark and the “discriminandum” was increased. A subgroup of these dogs was also tested on a delayed nonmatching to position spatial memory task (DNMP), which relies on egocentric spatial cues. These findings suggest that dogs can acquire both allocentric and egocentric spatial tasks. These data provide a useful tool for evaluating the ability of canines to use allocentric cues in spatial learning.     

Physical Attractiveness Contrast Effect and the Moderating Influence of Self-Consciousness

Separate studies provided evidence of amoderating effect of public selfconsciousness (trait)and public self-awareness (state) on the physicalattractiveness contrast effect involving socialcomparison between the self and others. Generally, whenexposed to photographs of attractive women withidealized physiques, women's self-perceptions of theirown physical attractiveness, social physique anxiety, and social self-esteem were each negativelyaffected. However, these negative contrast effects weremost apparent among women with high publicself-consciousness (trait assessment, Study 1) or highpublic self-awareness (state inducement, Study 2).Implications of these findings are considered.     

Forms of Competitive Attitude and Achievement Orientation in Relation to Disordered Eating

The primary focus in this study was anexamination of the differential contributions of twodifferent forms of competitive attitude to disorderedeating in a nonclinical sample of Caucasian universitywomen. The results showed that it is not competitionper se that is a primary contributor to eatingdisorders, but rather a particular form of competitiveattitude. Specifically, hypercompetitiveness was related strongly to eating disorder symptoms, butpersonal development competitiveness was unrelated. Asecond purpose considered the relationship ofcontext-specific measures of achievement to eatingdisorder symptoms. Disordered eating was associatedpositively with the need to achieve in appearance, butnot to a need to achieve in academics and career.Discussion centered on the potential usefulness of these findings in the treatment of women who areeating disordered. It also argued for changes in asocialization process which often leads to thedevelopment of hypercompetitive attitudes and anovervaluing of beauty in American women.