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Titolo:
Variability of residual vision in hemianopic subjects
Autore:
Wessinger, CM; Fendrich, R; Gazzaniga, MS;
Indirizzi:
Dartmouth Coll, Ctr Cognit Neurosci, Hanover, NH 03755 USA Dartmouth CollHanover NH USA 03755 ognit Neurosci, Hanover, NH 03755 USA Dartmouth Coll, Dept Psychol, Hanover, NH 03755 USA Dartmouth Coll Hanover NH USA 03755 , Dept Psychol, Hanover, NH 03755 USA
Titolo Testata:
RESTORATIVE NEUROLOGY AND NEUROSCIENCE
fascicolo: 2-3, volume: 15, anno: 1999,
pagine: 243 - 253
SICI:
0922-6028(1999)15:2-3<243:VORVIH>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRIATE CORTEX; VISUAL-PERCEPTION; MACAQUE MONKEYS; BLINDSIGHT; DISCRIMINATION; FIELD; SENSITIVITY; BLINDNESS; SCOTOMA; DAMAGE;
Keywords:
blindsight; hemianopia; stabilized visual field mapping; residual vision; islands of vision;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Wessinger, CM Dartmouth Coll, Ctr Cognit Neurosci, HB 6162 Silsby Hall, Hanover, NH 03755 USA Dartmouth Coll HB 6162 Silsby Hall Hanover NH USA 03755 USA
Citazione:
C.M. Wessinger et al., "Variability of residual vision in hemianopic subjects", REST NEUROL, 15(2-3), 1999, pp. 243-253

Abstract

Using stabilized visual field mapping techniques, seven hemianopic subjects were extensively investigated for residual visual abilities. Isolated islands of detection abilities were demonstrated by four of these subjects. Additional abilities demonstrated within these islands included saccadic and verbal localization, wavelength discrimination, form discrimination, and motion detection. These abilities were also accompanied by low-confidence ratings, and thus have the character of blindsight. It is noteworthy that different subjects demonstrated different abilities at different visual field locations, underscoring the between and within subject variability often observed with blindsight. Furthermore, magnetic resonance images obtained for each subject demonstrated variable sparing of occipital cortex. Such cortical sparing, in conjunction with the behavioral variability, supports the notion that some instances of blindsight are mediated by remnants of the primary visual pathway.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 23:49:18