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Titolo:
Response characteristics of the normal retino-cortical pathways as determined with simultaneous recordings of pattern visual evoked potentials and simple motor reaction times
Autore:
McKerral, M; Lepore, F; Lachapelle, P;
Indirizzi:
Univ Montreal, Dept Psychol, Grp Rech Neuropsychol Expt, GRENE, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 NE, Montreal, PQ H3C 3J7, Canada Ctr Readaptat Lucie Bruneau, Programme Integrat Dans Communaute, PIC, Montreal, PQ, Canada Ctr Readaptat Lucie Bruneau Montreal PQ Canada PIC, Montreal, PQ, Canada McGill Univ, Montreal Childrens Hosp, Res Inst, Dept Ophthalmol, Montreal,PQ H3H 1P3, Canada McGill Univ Montreal PQ Canada H3H 1P3 almol, Montreal,PQ H3H 1P3, Canada
Titolo Testata:
VISION RESEARCH
fascicolo: 8, volume: 41, anno: 2001,
pagine: 1085 - 1090
SICI:
0042-6989(200104)41:8<1085:RCOTNR>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPATIAL-FREQUENCY; REVERSAL; CHECKERBOARD; COMPONENTS; AMBLYOPIA; TRANSIENT; STIMULI; LATENCY; ONSET; SIZE;
Keywords:
contrast; motor reaction time (RT); pattern reversal visual evoked potential (PVEP); retino-cortical processing; spatial frequency;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Lachapelle, P Univ Montreal, Dept Psychol, Grp Rech Neuropsychol Expt, GRENE, CP 6128, Montreal, PQ H3C 3J7, Canada Univ Montreal CP 6128 Montreal PQCanada H3C 3J7 3J7, Canada
Citazione:
M. McKerral et al., "Response characteristics of the normal retino-cortical pathways as determined with simultaneous recordings of pattern visual evoked potentials and simple motor reaction times", VISION RES, 41(8), 2001, pp. 1085-1090

Abstract

Purpose: In an attempt to explain the existing discrepancies regarding therelationship between electrophysiological and psychophysical measurements of visual transmission time we compared, in humans, the response characteristics of the normal retino-cortical pathways with simultaneously obtained pattern visual evoked potentials (PVEP) and simple motor reaction times (RT). Methods: PVEPs and manual RTs were recorded simultaneously using a reversing checkerboard with different spatial frequency and contrast combinationschosen to elicit responses favoring the magnocellular or parvocellular pathways. The amplitude and peak time of the P1 wave of the PVEP were comparedto the mean RT. Other parameters of the RT, such as mode and standard deviation were also considered. Results: The RT is not modified in the same fashion as the peak time of the P1 wave of the PVEP, the peak time of the PVEPdemonstrating a spatial frequency selectivity, while the RT does not. Further comparative analysis of the PVEP and RT shows that the RT is faster forstimuli of lower contrast and spatial frequency, while the PVEP amplitude is larger and its peak time shorter for higher contrast and spatial frequency stimuli. Conclusions: Our findings suggest that PVEP and RT measures recruit distinct physiological characteristics and appear to be differently modulated while travelling along the retino-cortical pathway. Our results also show the importance of obtaining electrophysiological and psychophysical measures concomitantly to insure elimination of combined inter-stimulus andinter-session variability. (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 04/04/20 alle ore 11:04:26