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Analyzes the two-component processes in switching attention. Details on the reaction time for switched; Data of event-related potentials from healthy college students; Details on the component processes of preparation and interference.

Presents experiments that investigated the ability of Parkinson patients to remember the characteristics of conditions under which a memory was acquired. Importance of availability of cues for Parkinson's disease in source memory; Generation effect as referring to better memory of information by people when they had to produce it, such as associated to a word, compared with information given to them.

Investigates the effects of cueing upon aptitude for shifting by patients with Parkinson's disease. Comparison of the costs of shifting when the stimulus ensemble remained constant from trial to trial, with the case in which a change of stimulus ensemble cued each shift of task; Specific but not general deficit in ability to shift of Parkinson's disease patients.