Loss of visual information in neglect: the effect of chromatic- versus luminance-contrast stimuli in a “what” task

被引:0
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作者
Sabrina Pitzalis
Francesco Di Russo
Donatella Spinelli
机构
[1] Centro Ricerche di Neuropsicologia,IRCCS Fondazione Santa Lucia
[2] University of Rome “La Sapienza”,Department of Psychology
[3] Istituto Universitario Scienze Motorie (IUSM),undefined
来源
Experimental Brain Research | 2005年 / 163卷
关键词
Neglect; Visual discrimination; Luminance contrast; Chromatic contrast; Magno versus parvo systems;
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摘要
One to four vertical bars were tachistoscopically presented at various eccentricities along the horizontal meridian to patients with right brain damage and neglect (n=7) and to a control group of right brain damaged patients without neglect (n=4). Luminance contrast stimuli and isoluminant chromatic contrast stimuli were used. The patients’ task was to report the number of bars. With luminance stimuli the neglect patients’ discrimination in the left visual field was reduced, particularly at the most leftward position tested (ca 20°) where about 20% of the bars were omitted. The loss of information was limited to luminance contrast stimuli. When chromatic contrast stimuli were used, accuracy was comparable in the two hemifields and between groups of patients. The differential pattern of results for chromatic and luminance contrast stimuli is consistent with the hypothesis of a selective deficit of the magno-cellular pathway in neglect.
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页码:527 / 534
页数:7
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