Optokinetic stimulation modulates neglect for the number space: evidence from mental number interval bisection.

Frontiers in Human Neuroscience
Konstantinos PriftisMarco Zorzi

Abstract

Behavioral, neuropsychological, and neuroimaging data support the idea that numbers are represented along a mental number line (MNL), an analogical, visuospatial representation of number magnitude. The MNL is left-to-right oriented in Western cultures, with small numbers on the left and larger numbers on the right. Left neglect patients are impaired in the mental bisection of numerical intervals, with a bias toward larger numbers that are relatively to the right on the MNL. In the present study we investigated the effects of optokinetic stimulation (OKS) - a technique inducing visuospatial attention shifts by means of activation of the optokinetic nystagmus - on number interval bisection. One patient with left neglect following right-hemisphere stroke (BG) and four control patients with right-hemisphere damage, but without neglect, performed the number interval bisection task in three conditions of OKS: static, leftward, and rightward. In the static condition, BG misbisected to the right of the true midpoint. BG misbisected to the left following leftward OKS, and again to the right of the midpoint following rightward OKS. Moreover, the variability of BG's performance was smaller following both leftward and rightward OKS, sugges...Continue Reading

Citations

Sep 1, 2012·Neuroscience and Biobehavioral Reviews·Mario BonatoCarlo Umiltà
Jun 19, 2013·Neuropsychologia·Nicolas MassonValérie Dormal
Jul 17, 2016·The European Journal of Neuroscience·Q ArshadA M Bronstein
Jan 3, 2018·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Carlo Semenza, Silvia Benavides-Varela
Nov 17, 2016·Experimental Brain Research·Ivan MoserFred W Mast
Jun 28, 2016·Psychological Research·Nicolas MassonValérie Dormal
Jul 20, 2018·Psychological Research·Elvio BliniMarco Zorzi
Jun 18, 2016·Neural Plasticity·Mario BonatoPatrik Vuilleumier

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