Optokinetic stimulation modulates neglect for the number space: Evidence from mental number interval bisection
Frontiers in Human Neuroscience, ISSN: 1662-5161, Vol: 6, Issue: FEBRUARY 2012, Page: 23
2012
- 24Citations
- 66Captures
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Metrics Details
- Citations24
- Citation Indexes24
- 24
- CrossRef14
- Captures66
- Readers66
- 66
Article Description
Behavioral, neuropsychological, and neuroimaging data support the idea that numbers are represented along a mental number line (MNL), an analogical, visuo-spatial 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 towards 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, suggesting that the attentional bias induced by OKS reduced the "indifference zone" that is thought to underlie the length effect reported in bisection tasks. We argue that shifts of visuospatial attention, induced by OKS, may affect number interval bisection, thereby revealing an interaction between the processing of the perceptual space and the processing of the number space. © 2012 Priftis, Pitteri, Meneghello, Umilta and Zorzi.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84933674671&origin=inward; http://dx.doi.org/10.3389/fnhum.2012.00023; http://www.ncbi.nlm.nih.gov/pubmed/22363280; http://journal.frontiersin.org/article/10.3389/fnhum.2012.00023/abstract; https://dx.doi.org/10.3389/fnhum.2012.00023; https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2012.00023/full
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