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
Neuropsychologiajournal_title
Neuropsychologiaauthors
Trojano L,Conson M,Maffei R,Grossi Ddoi
10.1016/j.neuropsychologia.2006.01.017subject
Has Abstractpub_date
2006-01-01 00:00:00pages
1569-74issue
9eissn
0028-3932issn
1873-3514pii
S0028-3932(06)00034-0journal_volume
44pub_type
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