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Titolo:
Pretectal neurons responding to slow wide-field retinal motion: could theycompensate for slow drift during fixation?
Autore:
Price, NSC; Ibbotson, MR;
Indirizzi:
Australian Natl Univ, Res Sch Biol Sci, Dev Neurobiol Grp, Canberra, ACT 2601, Australia Australian Natl Univ Canberra ACT Australia 2601 rra, ACT 2601, Australia
Titolo Testata:
CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY
fascicolo: 3, volume: 29, anno: 2001,
pagine: 201 - 205
SICI:
1442-6404(200106)29:3<201:PNRTSW>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
WALLABY MACROPUS-EUGENII; OPTIC TRACT; TAMMAR WALLABY; CALCIUM ACCUMULATION; SENSITIVE NEURONS; VISUAL-MOTION; IN-VIVO; NUCLEUS; MOVEMENT; ADAPTATION;
Keywords:
direction-selective; fixation; motion detector; oculomotor system;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Ibbotson, MR Australian Natl Univ, Res Sch Biol Sci, Dev Neurobiol Grp, GPO Box 475, Canberra, ACT 2601, Australia Australian Natl Univ GPO Box 475 Canberra ACT Australia 2601
Citazione:
N.S.C. Price e M.R. Ibbotson, "Pretectal neurons responding to slow wide-field retinal motion: could theycompensate for slow drift during fixation?", CLIN EXP OP, 29(3), 2001, pp. 201-205

Abstract

The visual response properties are described of a group of retinal slip neurons in the wallaby pretectum, referred to as slow cells. Their responses to motion are direction-selective: tempero-nasal and naso-temporal motion over the contralateral eye increase and decrease, respectively, the firing rate relative to the spontaneous level. Slow cells are maximally sensitive to image velocities from 0.08 to 10 degrees /s. The present study focuses onslow cells that are maximally sensitive to image velocities below 1 degrees /s. An interesting characteristic of 82% of slow cells is that once motion stops, the firing rate exhibits a same-sign after-response. This is characterized by a slow exponential return from the firing rate during motion tothe spontaneous rate. The time constants of the after-responses are independent of the temporal frequency, velocity, duration and direction of the motion stimulus. It is proposed that the neurons may assist the stabilizationof eye position during fixation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 03:17:34