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Brain, Vol. 118, No. 1, 153-166, 1995
© 1995 Oxford University Press

research-article

Covert visuospatial attentional mechanisms in Parkinson's disease

Keree M. B. Bennett1, Carl Waterman4, Marina Scarpa2 and Umberto Castiello3,

1Department of General Psychology, University of Padova Italy 2Department of Neurology, University of Modena Italy 3Department of Psychology, University of Bologna Italy 4Department of Exercise Science and Physical Education, Arizona State University USA

Correspondence to: Umberto Castiello, Dipartimento di Psicologia, Universitá di Bologna, Viale Berti Pichat, 5, 40127 Bologna, Italy

Orienting and focusing of attention were assessed in 32 Parkinson's disease and 32 control subjects. No differences were found in the covert orienting of attention, suggesting that the Parkinson's disease subjects of the current study were not impaired in the ability to orient attention towards an expected source of stimulation. However, with the process of modulating the attentional focus or of managing more than one attentional task, dysfunction in Parkinson's disease subjects became apparent. The observed results are explained in terms of deficits in the relationship between task-related distribution of attentional resources and time efficiency of processing.

attention; Parkinson's disease; covert orienting; focusing attention; splitting attention

Received May 19, 1994. Revised July 12, 1994. Accepted August 3, 1994.


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