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Titolo:
Visual responses of neurons in the middle temporal area of New World monkeys after lesions of striate cortex
Autore:
Rosa, MGP; Tweedale, R; Elston, GN;
Indirizzi:
Univ Queensland, Vis Touch & Hearing Res Ctr, St Lucia, Qld 4072, Australia Univ Queensland St Lucia Qld Australia 4072 St Lucia, Qld 4072, Australia Monash Univ, Dept Physiol, Clayton, Vic 3800, Australia Monash Univ Clayton Vic Australia 3800 siol, Clayton, Vic 3800, Australia Australian Natl Univ, Div Psychol, Canberra, ACT, Australia Australian Natl Univ Canberra ACT Australia ol, Canberra, ACT, Australia
Titolo Testata:
JOURNAL OF NEUROSCIENCE
fascicolo: 14, volume: 20, anno: 2000,
pagine: 5552 - 5563
SICI:
0270-6474(20000715)20:14<5552:VRONIT>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CALLITHRIX-JACCHUS; VISUOTOPIC ORGANIZATION; MARMOSET MONKEY; MACAQUE MONKEY; REVERSIBLE INACTIVATION; TOPOGRAPHIC PLASTICITY; RETINAL LESIONS; ADULT CAT; BLINDSIGHT; MT;
Keywords:
marmoset; vision; extrastriate; receptive fields; blindsight; scotoma;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Rosa, MGP Univ Queensland, Vis Touch & Hearing Res Ctr, St Lucia, Qld 4072, Australia Univ Queensland St Lucia Qld Australia 4072 Qld 4072, Australia
Citazione:
M.G.P. Rosa et al., "Visual responses of neurons in the middle temporal area of New World monkeys after lesions of striate cortex", J NEUROSC, 20(14), 2000, pp. 5552-5563

Abstract

In primates, lesions of striate cortex (V1) result in scotomas in which only rudimentary visual abilities remain. These aspects of vision that survive V1 lesions have been attributed to direct thalamic pathways to extrastriate areas, including the middle temporal area (MT). However, studies in New World monkeys and humans have questioned this interpretation, suggesting that remnants of V1 are responsible for both the activation of MT and residual vision. We studied the visual responses of neurons in area MT in New World marmoset monkeys in the weeks after lesions of V1. The extent of the scotoma in each case was estimated by mapping the receptive fields of cells located near the lesion border and by histological reconstruction. Two response types were observed among the cells located in the part of MT that corresponds, in visuotopic coordinates, to the lesioned part of V1. Many neurons (62%) had receptive fields that were displaced relative to their expected location, so that they represented the visual field immediately surrounding the scotoma. This may be a consequence of a process analogous to the reorganization of the V1 map after retinal lesions. However, another 20% of the cells had receptive fields centered inside the scotoma. Most of these neurons were strongly direction-selective, similar to normal MT cells. These results show that MT cells differ in their responses to lesioning of V1 and that only a subpopulation of MT neurons can be reasonably linked to residual vision and blindsight.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:15:34