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I Wegener

Publications and source records attributed to I Wegener.

5 recordsLinked to original sources
PubMed1998

Unraveling social categorization in the "who said what?" paradigm.

A multinomial model of the "Who said what?" paradigm (S. E. Taylor, S. T. Fiske, N. J. Etcoff, & A. J. Ruderman, 1978) explains the pattern of participants' assignment errors by means of the joint operation of several processes. Specifically, memory for discussion statements, person memory, category memory, and 3 different guessing processes can be accommodated by the model. The model's ability to disentangle these processes is validated in a series of 5 experiments. The model thereby enables a more refined use of the "Who said what?" paradigm in testing theories of social categorization. This is demonstrated in a 6th experiment in which the validated model is applied to the study of the effects of cognitive load on categorization.

Adult↗
PubMed1998

A rigorous complexity analysis of the (1 + 1) evolutionary algorithm for separable functions with Boolean inputs.

Evolutionary algorithms (EAs) are heuristic randomized algorithms which, by many impressive experiments, have been proven to behave quite well for optimization problems of various kinds. In this paper a rigorous theoretical complexity analysis of the (1 + 1) evolutionary algorithm for separable functions with Boolean inputs is given. Different mutation rates are compared, and the use of the crossover operator is investigated. The main contribution is not the result that the expected run time of the (1 + 1) evolutionary algorithm is theta (n ln n) for separable functions with n variables but the methods by which this result can be proven rigorously.

Algorithms↗
PubMed1983

Somatostatin-28 is an hormonally active peptide secreted into hypophysial portal vessel blood.

Somatostatin 14 and 28 (SS-14 and SS-28) have been measured in hypophysial portal blood of male Wistar rats. The concentration and total amount of SS released into portal blood were increased 6- to 7-fold by electrical stimulation of the median eminence. On HPLC, only two peaks of immunoreactivity were detected in extracts of portal plasma and these peaks corresponded with SS-14 and SS-28, respectively. The amount of SS-28 in portal plasma was, on a molar basis, similar or greater than that of SS-14 and this together with other evidence suggests that SS-28 is an hormonally active peptide.

Animals↗