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To the Editor:
Oliveri et al.1 reported that space is overestimated on the left side when right-handed healthy subjects assessed “the distance between the middle number and that positioned at its left side.” This “pseudoneglect” was absent after the right parietal lobe was temporarily decommissioned by repetitive transcranial magnetic stimulation (rTMS). The possible mechanism suggested is “a physiologic tendency to overestimate left side internal spatial representations…” Alternatively, they suggested “the specific involvement of right parietal cortex.” However, both of these explanations are restating the problem they set out to answer. They also did not mention of the role of corpus callosum in pathologic neglect or in health.
Clinically, the role of corpus callosum in mediating neglect is manifested by a critical negative observation, i.e. absence of any reports concerning the well known temporary improvement of neglect upon moving the nondominant side without an extant anterior callosum.2 Experimentally, the role of callosum in handedness and simultaneity judgments is …
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