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NEUROLOGY 2004;63:2139-2141
© 2004 American Academy of Neurology
Brief Communications

Overestimation of numerical distances in the left side of space

M. Oliveri, MD, PhD, V. Rausei, PsyD, G. Koch, MD, S. Torriero, PsyD, P. Turriziani, PhD and C. Caltagirone, MD

From Laboratorio di Neurologia Clinica e Comportamentale (Drs. Oliveri, Koch, Torriero, Turriziani, and Caltagirone), Fondazione "Santa Lucia" IRCCS, Rome; Dipartimento di Psicologia (Drs. Oliveri, Rausei, and Turriziani), Università di Palermo; and Clinica Neurologica (Dr. Caltagirone), Università di Roma Tor Vergata, Italy.

Address correspondence and reprint requests to Dr. Massimiliano Oliveri, Neurologia Clinica e Comportamentale, Fondazione "Santa Lucia" IRCCS, Via Ardeatina 306, Rome 00179, Italy; e-mail: maxoliveri{at}tiscali.it

Normal subjects presented with a middle number and two left- and right-sided outer numbers overestimate the numerical distance between the middle number and that positioned at its left side. Repetitive transcranial magnetic stimulation (rTMS) of the right posterior parietal cortex specifically counteracts this bias, suggesting that the mental representation of space defined by numbers is shifted toward the left side depending on a greater activity of the right hemisphere.

Received February 16, 2004. Accepted in final form June 14, 2004.

See also pages 1994 and 2136




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Overestimation of numerical distances in the left side of space
Iraj Derakhshan
Neurology Online, 31 Jan 2005 [Full text]
Reply to Derakhshan
Massimiliano Oliveri
Neurology Online, 31 Jan 2005 [Full text]

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