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Analyzes the task shifting in dual-task settings. Evaluation of participant mean reaction times in a dual-task setting; Examination of shift-cost hypothesis using a dual-task methodology; Reference to the Baddeley working memory model.

Investigates whether patients with Parkinson's disease showed disproportional deficits in regulating responses to two sequential presented stimuli. Use of the Psychological Refractory Period paradigm; Stimulus onset asynchrony; Classical effects of both patients with Parkinson's disease and normal controls.

Presents information on the research of Parkinson's disease, and the object-based and location-based shifting of attention. Information on methodology used; Indepth look at the disease.

Studies the orienting attention to visual stimuli in patients with Parkinson's disease whose responses were compared to those of a matched control group using a cued reaction-time task. Measurement of cost and benefit effects of orienting of attention; Computation of the means of the median reaction times for correct responses for each group.

Studies shifts of attention in semantic space, using a semantic monitoring task based on rapid, serial, visually presented sequences of words. Drop in the accuracy of semantic monitoring following a shift of criterion; Nature of the recovery accuracy following a shift of criterion; Problems in the design.

Introduces a method for studying shifts of attention in semantic space, testing subjects in experiments on a semantic monitoring task based on rapid, serial, visually presented (RSVP) word-sequences. Stimulus materials and design; Comparison of kinds of criterion-shifts; Difference in a shift between different processing domains; Shift within the same processing domains.

Examines whether patients with Parkinson's disease differ from age-matched control subjects in patterns of preservation and impairment of attentional shift in nonvisuospatial domains. Use of a precueing paradigm developed by Poster to examine visuospatial shifting of attention; Measurement of the speed of shifting attention using the cost and benefit analysis.

Examines set-shifting aptitude in patients with Parkinson's disease. Use of a modified version of the odd-man-out test; Study of 12 patients who were asked to execute in alternation two different sorting rules over successive items; Impairment of patients on the tasks with internal cues.