A chronometric analysis of strategy preparation in choice reactions.

In this research, we investigated the processofpreparing strategies for performing choice-reaction tasks. Before each choice-reaction trial, subjects were shown a cue that indicated features of the stimulus-response mapping to be used on the upcoming trial. Subjects used this cue to specify their strategy for responding to the stimulus. The time needed for specifying the strategy was measured by allowing subjects to control the cue presentation and surreptitiously recording how long they spent looking at the cue. The experiments demonstrated that the time to prepare a strategy was a function of the number and nature of the strategy features that had to be specified; simple uncertainty about the possible strategies had little direct effect. The results disconfirmed a serial model in which the time to prepare a strategy is the sum of the times to specify the individual strategy features. A mixed serial-parallel model was proposed as an alternative.