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Titolo:
Visual evoked potentials elicited by chromatic motion onset
Autore:
McKeefry, DJ;
Indirizzi:
Univ Ulster, Sch Biomed Sci, Vis Sci Res Grp, Coleraine BT52 1SA, Londonderry, North Ireland Univ Ulster Coleraine Londonderry North Ireland BT52 1SA y, North Ireland
Titolo Testata:
VISION RESEARCH
fascicolo: 15, volume: 41, anno: 2001,
pagine: 2005 - 2025
SICI:
0042-6989(200107)41:15<2005:VEPEBC>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
RETINAL GANGLION-CELLS; CONTRAST SENSITIVITY; COLOR-VISION; VELOCITY DISCRIMINATION; TEMPORAL FREQUENCY; LUMINANCE FLICKER; COHERENT MOTION; STRIATE CORTEX; MACAQUE MONKEY; PERCEPTION;
Keywords:
colour; motion; visual evoked potentials;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
84
Recensione:
Indirizzi per estratti:
Indirizzo: McKeefry, DJ Univ Bradford, Dept Optometry, Bradford BD7 1DP, W Yorkshire,England Univ Bradford Bradford W Yorkshire England BD7 1DP , England
Citazione:
D.J. McKeefry, "Visual evoked potentials elicited by chromatic motion onset", VISION RES, 41(15), 2001, pp. 2005-2025

Abstract

Visually Evoked Potentials (VEPs) were recorded in response to the onset of chromatic and luminance motion gratings of 1 cpd and luminance 40 cd m(-2) subtending a 7 degrees field. At slow speeds (less than or equal to2 cycles s(-1)) the motion onset response exhibits a clear amplitude minimum at isoluminance. Over the Michelson contrast range tested (0.05-0.75) the chromatic response at 2 cycles s(-1) possesses a linear response function compared to the saturating function of the luminance response and the contrast dependency of the former is a factor of 5-6 times greater than for the latter. These differences are suggestive of different neural substrates for the chromatic and luminance motion VEPs at slow speeds. At 10 cycles s(-1) the chromatic motion onset VEP exhibits no amplitude minimum at isoluminance andbecomes more like its luminance counterpart in terms of its saturating contrast response function. Furthermore, the contrast dependency of the chromatic and luminance responses differs by only a factor of 1.6 at this faster rate. These findings are consistent with the idea of separate motion mechanisms that operate at fast and slow speeds, the latter having separate channels for colour and luminance motion. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:03:53