Document Detail

Spatial summation in blindsight.
MedLine Citation:
PMID:  8257669     Owner:  NLM     Status:  MEDLINE    
Spatial summation curves were determined in the circumscribed visual-field defects of five patients with blindsight. Under light-adapted conditions that favor the color-opponent system, increment thresholds for white and red targets presented on a white background were measured as a function of stimulus size which ranged from 9-110 min arc. In both normal and defective hemifields, summation was linear for the red stimuli. In contrast, the curves measured with the white stimuli showed some nonlinearity in the normal hemifield, and a pronounced eccentricity-dependent notch in the field defect. The results indicate that the neurons mediating sensitivity differ in their summation properties for wavelength and intensity information.
P Stoerig
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Visual neuroscience     Volume:  10     ISSN:  0952-5238     ISO Abbreviation:  Vis. Neurosci.     Publication Date:    1993 Nov-Dec
Date Detail:
Created Date:  1994-01-19     Completed Date:  1994-01-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8809466     Medline TA:  Vis Neurosci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1141-9     Citation Subset:  IM    
Institut für Medizinische Psychologie, Ludwig-Maximilians-Universität, München, Germany.
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MeSH Terms
Color Perception
Hemianopsia / physiopathology*
Middle Aged
Sensory Thresholds
Vision Disorders / physiopathology*
Visual Cortex / physiopathology
Visual Fields*

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