The effects of stimulant drugs on curiosity behaviors of hyperactive boys

The curiosity behaviors of 20 hyperactive boys, both on and off stimulant drugs, and in relation to 20 nonhyperactive boys, were assessed. Comparisons on object, manipulative, conceptual, perceptual, and reactive curiosity tasks indicated that stimulants reduced only the object curiosity task performance of hyperactive boys, although the level tended to remain above that of nonhyperactive boys. Also, hyperactive boys both on and off drugs tended to have lower conceptual curiosity scores than controls. Implications are discussed.     

Cognitive Resources and Leadership Performance: A Rejoinder

I feel very honoured by the distinguished group of colleagues who consented to comment on my paper. All raised thought-provoking questions which merit a detailed reply. I only regret that the strict space limitation imposed by the editor restricts my response to points on which my paper was unclear, and to a few important substantive issues. It would have been very satisfying to explore the many constructive and highly intriguing insights contained in the commentators' contributions.     

The Contribution of Cognitive Resources and Leader Behavior to Organizational Performance1

A recently proposed cognitive resource theory of leadership effectiveness explicates the role of such cognitive variables as intellectual abilities, technical competence, and job-relevant knowledge (experience) in determining group performance. This paper reviews research showing that the leaders' intellectual abilities contribute to performance only when leaders are directive, do not experience stress, have supportive groups, and work on tasks which require intellectual effort.     

Construal Level Theory as an Integrative Framework for Behavioral Decision‐Making Research and Consumer Psychology

In this comment to Trope, Liberman and Makslak's lead article, I refrain from any attempt to review or recapitulate the growing body of research in social psychology in general and in consumer science in particular that is explicitly devoted to construal level theory (CLT). Rather, granting the status of CLT as a leading contemporary theory, with rich implications and applications in consumer science, I concentrate on recent phenomena in judgment and decision making for which CLT provides an implicit account. Specifically, CLT affords an integrative framework for understanding a whole variety of preference reversals—a major challenge for students of consumer behavior.     

Nonproportional sampling and the amplification of correlations

A theoretical analysis shows that sample correlations between two binary variables will be inflated when the frequency distributions of the two variables are flatter (i.e., closer to equal frequencies for the two values) in the sample than in the population. A correlation-assessment study in which participants were free to choose their own sample revealed an overwhelming preference for samples that included roughly the same number of observations for the two values of dichotomous variables, irrespective of their actual distribution in the population. Subjective estimates of observed correlations followed the sample correlations--which were inflated, as predicted--more closely than the true correlations. People's sampling behavior thus resembles that of a research designer who maximizes the chance of detecting a relationship, at the cost of diminished accuracy in estimating its strength.     

An electrophysiological study of the insertion of overt response choice

Using electrophysiological measures, the authors studied changes in prestimulus state, stimulus identification, and response-related processing when, in a go/no-go task, forced choice between 2 overt go responses was inserted. The authors observed decreased prestimulus motor preparation (electromyogram), no change in stimulus identification time (selection negativity), a minor increase in response selection time (lateralized readiness potential), a large increase in response preparation time (lateralized readiness potential), a minor effect on response execution time (electromyogram), and a decrease in the activation of a response-inhibition process on no-go trials (frontal event-related potential). The existence of the response-inhibition process was verified by the presence of inverted lateralized readiness potentials on no-go trials. Pure insertion of response choice in a task seems impossible because the choice between activation and inhibition (go/no-go) always seems already present.