Figure 1.

Experimental setup and conditions. (A) Electrophysiological recordings. Throughout the 10 blocks of 100 trials, electrophysiological recordings were performed from 64 electrodes in accordance with the extended 10/20 system. To analyze interhemispheric transfer time, we focused our analyses on the activities recorded over the posterior parietal (P3/P4) and central sites (C3/C4) depicted here as violet circles and orange squares, respectively. (B) Computation of the interhemispheric transfer time. Given the crossed organization of visual neural pathways, the direct response to the visual stimulation was recorded over the contralateral hemisphere whereas the indirect response, i.e., after interhemispheric transfer, was recorded over the ipsilateral hemisphere to the stimulation. Difference between the latencies of N160 peak (most negative deflection around 160 ms) recorded over both hemispheres gave an estimation of the interhemispheric transfer time (IHTT) from right to left (gray arrow) when the target appeared in LVF and from left to right (green arrow) when it appeared in RVF.