Document Detail

Blindsight in monkeys.
MedLine Citation:
PMID:  7816139     Owner:  NLM     Status:  MEDLINE    
Blindsight, the visually evoked voluntary responses of patients with striate cortical destruction that are demonstrated despite a phenomenal blindness, has attracted attention from neuroscientists and philosophers interested in problems of perceptual consciousness and its neuronal basis. It is assumed to be mediated by the numerous extra-geniculostriate cortical retinofugal pathways whose properties are studied primarily in monkeys. Like patients with blindsight, monkeys with lesions of the primary visual cortex can learn to detect, localize and distinguish between visual stimuli presented within their visual field defects. Although the patients deny seeing the stimuli they can nevertheless respond to (by forced-choice guessing) in their phenomenally blind fields, it is not known whether the monkeys experience the same absence of phenomenal vision. To determine whether they too have blindsight, or whether they actually see the stimuli in their field defects, monkeys who showed excellent detection in tasks where a visual stimulus was presented on every trial, albeit at different positions, were tested in a signal-detection task in which half the trials were blank trials, with no visual stimulus. They classified the visual stimuli presented in the field defect as blank trials, demonstrating, like patients, blindsight rather than degraded real vision.
A Cowey; P Stoerig
Related Documents :
10436069 - Motion opponency in visual cortex.
16194969 - The perceptual-mnemonic/feature conjunction model of perirhinal cortex function.
12441399 - Optical imaging reveals retinotopic organization of dorsal v3 in new world owl monkeys.
7862679 - Visual latencies in cytochrome oxidase bands of macaque area v2.
22826609 - Mapping the human cortical surface by combining quantitative t(1) with retinotopy.
22661619 - Is race erased? decoding race from patterns of neural activity when skin color is not d...
24560579 - Olfactory coding in the honeybee lateral horn.
16949139 - Estrogen and the development and protection of nigrostriatal dopaminergic neurons: conc...
3915659 - Dynamic eeg topography and analysis of epileptic spikes and evoked potentials following...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Nature     Volume:  373     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  1995 Jan 
Date Detail:
Created Date:  1995-02-09     Completed Date:  1995-02-09     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  247-9     Citation Subset:  IM    
Department of Experimental Psychology, Oxford University, UK.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Corpus Callosum / physiology,  surgery
Macaca mulatta
Photic Stimulation
Vision, Ocular / physiology*
Visual Cortex / physiology*,  surgery
Visual Fields / physiology
Comment In:
Nature. 1995 Jan 19;373(6511):195   [PMID:  7816127 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Transplanting a unique allosteric effect from crocodile into human haemoglobin.
Next Document:  Blood flow changes in human somatosensory cortex during anticipated stimulation.