It occupies a 'C'-shaped belt of cortex whose upper branch is in the depth of the parieto-occipital sulcus (POS) and lower one is in the depth of the medial parieto-occipital sulcus (POM), with the medial surface of the brain as a zone of junction between the two branches.
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The equivalent sources of the parietal signals clustered within 1 cm3 in the medial parieto-occipital sulcus and did not differ significantly between the stimuli. This result strengthens our previous suggestion that the medial parieto-occipital sulcus is the human homologue of the monkey V6 complex, characterized by, for example, lack of retinotopy and the absence of relative foveal magnification..
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Responses to hemifield luminance stimuli also had an occipital component, but they were dominated by activation of the medial parieto-occipital sulcus (POS) 60-70 ms later.
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