Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Selective activation of visual cortex neurons by fixational eye movements:Implications for neural coding
Autore:
Snodderly, DM; Kagan, I; Gur, M;
Indirizzi:
Schepens Eye Res Inst, Boston, MA 02114 USA Schepens Eye Res Inst Boston MA USA 02114 Res Inst, Boston, MA 02114 USA Harvard Univ, Sch Med, Dept Ophthalmol, Boston, MA USA Harvard Univ Boston MA USA niv, Sch Med, Dept Ophthalmol, Boston, MA USA Harvard Univ, Sch Med, Neurosci Program, Boston, MA 02115 USA Harvard Univ Boston MA USA 02115 , Neurosci Program, Boston, MA 02115 USA Technion Israel Inst Technol, Dept Biomed Engn, IL-32000 Haifa, Israel Technion Israel Inst Technol Haifa Israel IL-32000 L-32000 Haifa, Israel
Titolo Testata:
VISUAL NEUROSCIENCE
fascicolo: 2, volume: 18, anno: 2001,
pagine: 259 - 277
SICI:
0952-5238(200103/04)18:2<259:SAOVCN>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRIATE CORTEX; RECEPTIVE-FIELDS; SACCADIC SUPPRESSION; IMAGE STABILIZATION; NATURAL SCENES; RHESUS-MONKEY; MACAQUE; V1; ORGANIZATION; RESPONSES;
Keywords:
fixational eye movements; neural coding; macaca; V1; receptive fields;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Snodderly, DM Schepens Eye Res Inst, 20 Staniford St, Boston, MA 02114 USASchepens Eye Res Inst 20 Staniford St Boston MA USA 02114 SA
Citazione:
D.M. Snodderly et al., "Selective activation of visual cortex neurons by fixational eye movements:Implications for neural coding", VIS NEUROSC, 18(2), 2001, pp. 259-277

Abstract

During normal vision, when subjects attempt to fix their gaze on a small stimulus feature, small fixational eye movements persist. We have recorded the impulse activity of single neurons in primary visual cortex (V1) of macaque monkeys while their fixational eye movements moved the receptive-field activating region (AR) over and around a stationary stimulus. Three types of eye movement activation were found. (1) Saccade cells discharged when a Fixation:ll saccade moved the AR onto the stimulus, off the stimulus, or across the stimulus. (2) Position/drift calls discharged during the intersaccadic (drift) intervals and were not activated by saccades that swept the AR across the stimulus without remaining on it. To activate these neurons, it was essential that the AR be placed on the stimulus and many of these cellswere selective for the sign of contrast. They had smaller ARs than the other cell types. (3) Mixed cells fired bursts of activity immediately following saccades and continued to fire at a lower rate during intersaccadic intervals. The tendency of each neuron to fire transient bursts or sustained trains of impulses following saccades was strongly correlated with the transiency of its response to stationary flashed stimuli. For one monkey, an extraretinal influence accompanying fixational saccades was identified. During natural viewing, the different eye movement classes probably make differentcontributions to visual processing. Position/drift neurons are well suitedfor coding spatial details of the visual scene because of their small AR size and their selectivity for sign of contrast and retinal position. However, saccade neurons transmit information that is ambiguous with respect to the spatial details of the retinal image because they are activated whether the AR lands on a stimulus contour, or the AR leaves or crosses the contourand lands in another location. Saccade neurons may be involved in constructing a stable world in spite of incessant retinal image motion, as well as in suppressing potentially confusing input associated with saccades.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 06:14:49