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Involvement of primary visual cortex in visual mental imagery: A transcranial magnetic stimulation study

✍ Scribed by André Aleman; Alfredo A. L. d'Alfonso; Albert Postma; Edward H.F. de Haan

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
699 KB
Volume
25
Category
Article
ISSN
0893-6609

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✦ Synopsis

It has been hypothesized that visual mental imagery and visual perception share the same processing systems in the brain. Evidence from ERP and PET studies examining this hypothesis is conflicting. In this study we investigated whether transcranial magnetic stimulation (TMS) over the occipital pole would interfere with visual imagery. Subjects performed a visual letterimagery task, while TMS was applied to the occipital cortex (2 cm above the inion). An increase in reaction times was observed at a delay of 300 ms or later in the experimental TMS condition, compared to a control TMS condition with the coil at an angle of 90'. These findings provide TMS evidence for primary visual cortex involvement in visual imagery.

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