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Previous measurements of visual attention in simple reaction time, choice reaction time and complex discrimination experiments in which attention was purported to move continuously across space are reanalyzed. These data and data from attention gating experiments are quantitatively predicted by an episodic (quantal) theory of spatial attention that proposes instead: (1) visual attention can be resolved into a sequence of discrete attentional acts (episodes), (2) each attentional episode i is defined by its spatial attention function [f.sub.T](x, y), (3) the smooth transition at time to between episodes is described by a temporal transition function G(t - [t.sub.0]), and (4) f and G are space-time separable. In new experiments, which use a concurrent motor reaction time task to control for nonattentional factors, the duration of an attention transition is shown to be independent of the distance traversed and of the presence of interposed visual obstacles.

The article discusses improvements to the Internet site of the city of Trier, Germany's Center for Psychological Information and Documentation (ZPID). The site is said to feature a user-oriented structure, modern design, and simplified navigation. It is said to be equally intended for technical specialists in science and practice and the laity.