Categorical and coordinate spatial processing in the imagery domain investigated by rTMS.

Abstract:

:Using repetitive transcranical magnetic stimulation (rTMS), we investigated the functional relevance of posterior parietal cortex for categorical and coordinate judgements in the spatial imagery domain. In the coordinate task, subjects were asked to imagine two analogue clock faces based on acoustically presented pairs of times, and to judge at which of the two times the clock hands form the greater angle (mental clock task); in the categorical task subjects were again asked to imagine an analogue clock face showing the time verbally presented by the examiner, but in this case they had to judge whether both hands lay in the half of the clock face cued by an auditorily presented label. We matched the performance of three groups of subjects, two of which received rTMS stimulation over left and right posterior parietal cortex, respectively, while the third group received a sham stimulation. The results showed that right parietal stimulation interfered with the execution of the coordinate task, while left parietal stimulation mainly affected the categorical task, but also reduced the learning effect on the coordinate task. The present findings support the hemispheric specialization of the posterior parietal cortex in different spatial information processing in the imagery domain.

journal_name

Neuropsychologia

journal_title

Neuropsychologia

authors

Trojano L,Conson M,Maffei R,Grossi D

doi

10.1016/j.neuropsychologia.2006.01.017

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

1569-74

issue

9

eissn

0028-3932

issn

1873-3514

pii

S0028-3932(06)00034-0

journal_volume

44

pub_type

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