A Choice Reaction Time Index of Callosal Anatomical Homotopy

Autor/inn/en	Desjardins, Sameul; Braun, Claude M. J.; Achim, Andre; Roberge, Carl
Titel	A Choice Reaction Time Index of Callosal Anatomical Homotopy
Quelle	In: Brain and Cognition, 71 (2009) 1, S.46-51 (6 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0278-2626
DOI	10.1016/j.bandc.2009.04.002
Schlagwörter	Visual Stimuli; Reaction Time; Models; Task Analysis; Brain Hemisphere Functions; Diagnostic Tests; Stimulation; Visual Perception + Suchen Sie Ihr Suchwort? Reaktionsvermögen; Analogiemodell; Aufgabenanalyse; Diagnostic test; Diagnostischer Test; Visuelle Wahrnehmung
Abstract	Tachistoscopically presented bilateral stimulus pairs not parallel to the meridian produced significantly longer RTs on a task requiring discrimination of shapes (Go/no-Go) than pairs emplaced symmetrically on each side of the meridian in Desjardins and Braun [Desjardins, S., & Braun, C. M. J. (2006). Homotopy and heterotopy and the bilateral field advantage in the Dimond paradigm. Acta Psychologica, 121, 125-136]. This was explained by the fact that there are more homotopic than heterotopic fibers in the corpus callosum. However: (1) different parts of the visual field were not equiprobably stimulated, possibly causing subtle biases, (2) the predicted cost of vertical asymmetry was tested only with bilateral stimuli, and (3) interstimulus distance was at the outer limit of callosal midline fusion (10.6[degrees]). Here, a tachistoscopic experiment with 24 normal participants replicated the between-field vertical symmetry advantage [Desjardins, S., & Braun, C. M. J. (2006). Homotopy and heterotopy and the bilateral field advantage in the Dimond paradigm. Acta Psychologica, 121, 125-136.], but without irrelevant stimulation conditions and with more proximal stimuli. In addition, a significant specific cost of vertical asymmetry of 7 ms was found for between-field integration over within-field integration. As far as we know, this is the first demonstration of an effect of callosal anatomical homotopy with reaction time. (Contains 2 figures.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10