Our results suggest that WM traces can be transferred from one prefrontal hemisphere to the other. Previous studies have only provided indirect evidence of this. In WM tasks, when sample and test stimuli appear in opposite visual hemifields, masking during the delay is more effective in the expected test hemifield (Zaksas et al., 2001). Associative cues presented to one visual hemifield can elicit associated representations in the opposite-hemisphere visual cortex (Tomita et al., 1999). Here, we provided direct neurophysiological evidence of WM transfer between hemispheres.
