Latency and accuracy characteristics of saccades and corrective saccades in children and adults

Accuracy and latency characteristics of the first saccade to a target together with the frequency and latency of corrective saccades were studied in children (mean age = 8.5) and adults. The independent variables manipulated were fixation-light offset to target-light onset warning interval (0 and 300 msec) and the presence and location of nontarget stimuli. Although saccade accuracy was significantly affected by nontarget lights, children could respond as accurately as adults and, in replication of previous findings, as quickly when a 300 msec warning interval was given. No speed-accuracy trade off was found for either group as a function of the warning signal condition. Children were as likely to make corrective saccades as adults, but did so with a significantly longer latency. Corrective saccade latencies were greater when a change in direction was required but this effect did not interact with age.     

Cognitive differentiation as a function of information type and its relation to career choice

Although providing occupational information is a common vocational counseling practice, recent research has raised questions about the utility of such information. Cognitive differentiation (the ability to differentiate among job titles on 12 constructs) has been shown to be positively related to an “appropriate” career choice. Differentiation, however, appears to decrease as a function of traditional types of occupational information (e.g., Occupational Outlook Handbook, U.S. Department of Labor, Washington, D.C., 1980). The present study investigated the hypothesis that information related to Holland personality characteristics of persons in various occupations would increase subjects' ability to differentiate among those job titles. One hundred fifty undeclared-major freshman undergraduate students were randomly assigned to one of three condition groups: objective information, personality information, no information. All subjects were administered the Career Decision Scale and Cognitive Differentiation Grid. Results indicated that subjects receiving personality information exhibited a significantly greater degree of differentiation among careers than subjects receiving objective information. These results confirm the major hypothesis of the study and suggest that the provision of personality information may be more useful in promoting career choice than the types of information traditionally provided.     

The effects of onset and offset warning and post-target stimuli on the saccade latency of children and adults

Two studies, involving children (mean age = 10 years) and adults, investigated the effects of visual stimulus onsets and offsets on the latency of saccades to peripheral targets. Saccade latency was reduced when foveal stimulus onsets or offsets preceded the target. When stimulus onset occurred 100 msec after target onset, the stimulus interfered with responding, with this interference effect significantly greater for children than for adults. When stimuli were presented in the peripheral visual field facilitation and interference effects were similar for children and adults. These results were interpreted as indicating that oculomotor processes are similar in children and adults while the stimulus intake processes that follow stimulus onset at the point of fixation have a greater interference effect on children's than on adults' eye movements.     

Effects of list length and first-trial reward upon concurrent discrimination performance

Rhesus monkeys were given 2304 two-trial object discrimination problems that were presented as members of lists consisting of two, four, or eight problems. The problems within each list were presented concurrently, Trial 1 for all problems in the list being presented before initiation of Trial 2 for any problem. Each problem involved exposure of a single object on Trial 1, which was either rewarded or not rewarded, followed by presentation of the Trial 1 object along with a second object on Trial 2. Performance varied inversely with list length, and this effect became more prominent as a function of training. Performance after Trial 1 nonreward was substantially better than that after Trial 1 reward, and this effect became enhanced both with continued training and with increased list length. The findings were discussed in terms of Bessemer's short-term memory analysis of learning set.     

Normative explanations of helping behavior: A critique,proposal, and empirical test

Criticisms of normative explanations of helping behavior are examined, and an explanation responsive to these criticisms is proposed. This explanation specifies conditions which affect the activation of personal norms and hence their influence on behavior. One hypothesis based on the explanation was tested: the impact of norms on behavior is a function of the tendency to deny or to ascribe responsibility to the self (AR). AR and personal norms toward donating bone marrow to a stranger were measured in a mailed questionnaire. Three months later, 132 women received mailed appeals to join a pool of potential donors from an unrelated source. As predicted, volunteering was a function of the AR × personal norm interaction (p < .0001). Personal norms had no impact on volunteering among those low on AR (deniers), but a substantial impact among those high on AR. Neither intentions to donate, attitudes toward transplants, nor various sociodemographic variables added to the variance in volunteering accounted for by the AR × personal norm interaction.     

Judging similarity among strings described by hierarchical trees

The paper compares the tree-theoretical model of similarity judgement (in which the similarity between two objects is a function of the distance between them in a conceptual tree) with an averaging model of similarity judgement that is drawn jointly from information integration theory and from current research indicating the prevalence of anchoring and adjustment mechanisms in judgement. Results of an experiment are presented that suggest that even when subjects organize conceptual material as a hierarchical tree, judgments of similarity among the objects are better accounted for by an averaging mechanism than by distances in the tree. These data are discussed in terms of the differences between the representation in which knowledge is encoded and the processes that operate on the represented information.     

Speech—Language clinicians'' and university students'' impressions of women and girls who stutter

To identify impressions speech—language clinicians and university students have of females who stutter, a 47-scale semantic differential form was administered to members of each group to obtain their responses to eight hypothetical constructs, i.e., “A Girl,” “A Girl Who Stutters,” “A Boy,” “A Boy Who Stutters,” “A Woman,” “A Woman Who Stutters,” “A Man,” and “A Man Who Stutters.” Both groups were found to possess negative stereotypes for all four categories of stutterers. The nature of the stereotypes appeared to be influenced by a stutterer's gender and relative age. Clinicians considered stuttering to exert a stronger negative impact on females and on children. Their strongest stereotype was of “A Girl Who Stutters.” University students considered stuttering to exert a stronger negative impact on males. Their stereotypes of stutterers seemed unaffected by the relative age of the stutterer. Their strongest stereotype was of “A Man Who Stutters.” Several theoretical and clinical implications of these findings are discussed.