Abstract：
:Previous neuroimaging studies provided evidence that visual mental imagery relies, in part, on the primary visual cortex. We hypothesized that, analogous to the finding that motor imagery increases the excitability of motor cortex, visual imagery should increase visual cortex excitability, as indexed by a decrease in the phosphene threshold (PT). In order to test visual cortex excitability, the primary visual cortex was stimulated with transcranial magnetic stimulation (TMS), so as to elicit phosphenes in the right lower visual quadrant. Subjects performed a visual imagery task and an auditory control task. We applied TMS with increasing intensity to determine the PT for each subject. Independent of the quadrant in which subjects placed their visual images, imagery decreased PT compared to baseline PT; in contrast, the auditory task did not change PT. These findings demonstrate for the first time a short-term, task-dependent modulation of PT. These results constitute evidence that early visual areas participate in visual imagery processing.
journal_name
Brain Resjournal_title
Brain researchauthors
Sparing R,Mottaghy FM,Ganis G,Thompson WL,Töpper R,Kosslyn SM,Pascual-Leone Adoi
10.1016/s0006-8993(02)02478-2subject
Has Abstractpub_date
2002-05-31 00:00:00pages
92-7issue
1-2eissn
0006-8993issn
1872-6240pii
S0006899302024782journal_volume
938pub_type
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