Abstract：
:We tend to mentally organize numbers along a left-to-right oriented horizontal mental number line, with the smaller numbers occupying the more leftward positions. This mental number line has been shown to exert an influence on the visuospatial allocation of attention, with presentation of numbers from the low and high ends of the mental number line inducing covert shifts of spatial attention to the left and right side of visual space, respectively. However, the neural basis of this modulation is not known. Here we used transcranial magnetic stimulation (TMS) to study the role of the angular gyrus in shifts in visuospatial attention induced by the mental number line. We used a priming paradigm with a line bisection task to assess the bias in spatial allocation of visual attention induced by exposure to either small (16-24) or large (76-84) ends of the mental number line. In the Small Number Prime condition, when attention is presumably biased to the left side of visual space, TMS applied over the right angular gyrus during the delay between the prime and the target line abolished the effect of number priming. In contrast, application of TMS over the left angular gyrus had no significant effect. In the Large Number Prime condition (which shifted attention to the right side of visual space) both left and right TMS over the angular gyrus modulated the effect of number priming. This pattern of results reveals the involvement of the angular gyrus in the interaction between the mental number line and visual spatial attention.
journal_name
Neuroimagejournal_title
NeuroImageauthors
Cattaneo Z,Silvanto J,Pascual-Leone A,Battelli Ldoi
10.1016/j.neuroimage.2008.09.003subject
Has Abstractpub_date
2009-01-15 00:00:00pages
563-8issue
2eissn
1053-8119issn
1095-9572pii
S1053-8119(08)00993-2journal_volume
44pub_type
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