Local-to-global form interference in biological motion perception

Point-light walkers have been useful to study the contribution of form and motion to biological motion perception by manipulating the lifetime, number, or spatial distribution of the light points. Recent studies have also manipulated the light points themselves, replacing them with small images of objects. This manipulation degraded the recognizability of biological motion, particularly for local images of human bodies. This result suggests an interference of body form information in the local images with the body form analysis necessary for global biological motion recognition at the global level. We further explored this interference with respect to its selectivity for body orientation and motion. Participants had to either discriminate the facing direction (left/right) or the walking direction (forward/backward) of a global walker composed of local stick figures that could face left or right and either stand still or walk forward or backward. Local stick figures interfered stronger with the facing direction task if they were facing in the same direction as the global walker. Walking (forward/backward/static) of the stick figures influenced neither the facing direction task nor the walking direction task. We conclude that the interference is highly specific since it concerns not only the category (human form), but even the facing direction.     

The nature of negative thoughts in depression

We investigated the nature and content of the negative thoughts that accompany depression by examining thoughts about oneself and others during three cognitive tasks: imaging, recall, and inference. Mildly depressed and nondepressed subjects were asked to image, recall, and make inferences about a variety of events while thinking about themselves or another person. The events were sad or happy and either social or nonsocial in nature. The results suggest that the negativity in thought that accompanies depression is restricted to thoughts about oneself and does not extend to thoughts about others. The relation between negative thoughts and the depressive's view of self is discussed. It is proposed that depressives have a negative self-schema that makes the affective nature of their behavior particularly salient.     

Possible selves and delinquency

The relationship between possible selves and delinquency is explored. In this study, 238 youths between the ages of 13-16 who varied in the degree of their delinquency were asked to describe their possible selves. Although many similarities were found among their hoped-for selves, the groups of youth differed markedly in the nature of their expected and feared selves. The balance between expected possible selves and feared possible selves was the particular focus. Balance is hypothesized to occur when expected possible selves are offset by countervailing feared selves in the same domain (e.g., expecting a job, but fearing being unemployed). It was found that the officially nondelinquent youths were quite likely to display balance between their expectations and fears, unlike the most delinquent youth. In contrast, a conventional measure of self-esteem that indicates how people feel about themselves currently did not predict degree of delinquency.     

Is visual lexical access based on phonological codes? Evidence from a picture-word interference task

The claim that lexical access for visual words is mandatorily mediated by their phonological codes was investigated. Ninety-six subjects performed timed naming responses to pictures while instructed to ignore printed words superimposed on the pictures. Distractor words were either semantically related to the picture label or were homophones of a word semantically related to the picture name. On the basis of the claim that homophones initially activate multiple semantic codes, we hypothesized that the homophone and semantic distractors would yield comparable interference. Picture-word stimulus onset asynchrony (SOA) was varied between subjects as 0 or +100 msec. For an SOA of 0 msec, semantic interference, but no effect from the homophones, was obtained. For an SOA of +100 msec, no effect was obtained in either condition. In combination, these findings indicate a limited role of phonological codes in visual lexical access. It is suggested that the role of phonology in written word identification may vary dependent on procedure and utility to the task.     

The effect of mere presence on social facilitation: An unobtrusive test

An unobstrusive experimental manipulation was used to test the hypothesis that the mere presence of others can influence an individual's performance. A task was employed for which there were no clear performance criteria, and which was very unlikely to engender evaluation aprehension. Performance times on this task (dressing and undressing in familiar and unfamiliar clothing) were compared for subjects working alone, in the presence of a passive inattentive person, and in the presence of an attentive spectator. In contrast with the Alone condition, both social conditions (Audience and Incidental Audience) enhanced performance on the well-learned aspects of the task (dressing and undressing with one's own clothing) and hindered performance on the more complex aspects (working with unfamiliar clothing). It is concluded that the mere presence of others is a sufficient condition for social facilitation and social interference effects.     

The bystander effect and social control behavior: the effect of the presence of others on people's reactions to norm violations

Observers of deviant social behavior sometimes communicate disapproval directly or indirectly to the perpetrator of a deviant act. This reaction has been termed ‘social control’. Three field studies were conducted to explore the influence of the number of bystander‐observers on the likelihood of social control. We predicted that the presence of others would inhibit people's tendency to communicate their disapproval to the deviant but only if personal implication was low. In the first study, we measured participants' perceptions of two fictive situations, one in which a deviant draws graffiti in an elevator of a shopping center and one in which a deviant litters in a small neighborhood park by throwing a plastic bottle in the bushes. As expected, participants considered both behaviors to be equally counternormative but felt personally more implicated by the littering behavior in the park. In Studies 2 and 3, the two situations were enacted with confederates of the experimenter. Naïve bystanders served as participants, and social control was the primary dependent variable. Consistent with our hypothesis, we found evidence for a bystander effect in the low personal implication situation (‘graffiti in the elevator’) but not in the high personal implication situation (‘littering in park’). These results make clear that perceived personal implication moderates the extent to which people are inhibited by the presence of others when they decide whether they should exert social control or not. Copyright © 2002 John Wiley & Sons, Ltd.