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Brain, Vol. 112, No. 6, 1627-1636, 1989
© 1989 Guarantors of Brain

research-article

INFLUENCE OF RESPONSE MODALITY ON PERCEPTUAL AWARENESS OF CONTRALESIONAL VISUAL STIMULI

EDOARDO BISIACH, GIUSEPPE VALLAR and GIULIANO GEMINIANI

Institute of Clinical Neurology, University of Milan Milan, Italy

Correspondence to: Correspondence to: Professor Edoardo Bisiach, Università di Milano, Istituto di Clinica Neurologica, Via Francesco Sforza 35, 20122 Milano, Italy.

Visual extinction on double simultaneous stimulation was investigated in left and right brain-damaged patients in two response conditions. verbal and motor In right brain-damaged patients contralesional detection was significantly worse when monitored by motor rather than by verbal responses in condition of single as well as of double stimulation Previous research in normal subjects had shown that the left hemisphere is selectively involved in choice reactions such as those occurring in the motor condition of the present experiment in brain-damaged patients. The results of the latter are interpreted using as a basis the findings of that research and Kinsbourne's hemisphere activation hypothesis concerning unilateral neglect of space

Received March 11, 1988. Revised February 17, 1989. Accepted March 10, 1989.


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