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Publication Detail
The role of the angular gyrus in visual conjunction search investigated using signal detection analysis and transcranial magnetic stimulation
Transcranial magnetic stimulation (TMS) delivered over the posterior parietal cortex increases choice reaction times in visual search for a target defined by a conjunction of features. Some recent studies of visual search have taken an approach based on signal detection theory, the findings of which are not addressed by studying the disruptive effects of TMS on reaction time. Here we investigated the role of the posterior parietal cortex in visual search by applying TMS while subjects performed unspeeded feature and conjunction visual search tasks matched for level of difficulty. TMS over the right, but not the left posterior parietal cortex or vertex decreased subjects' sensitivity on the conjunction but not the feature search task. Changes in bias, specifically the tendency to make false positive responses, were less clear. The reduction in d' suggests that the contribution of the PPC to visual search is related to the fidelity with which signals carrying sensory information from extrastriate cortex are interpreted.
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