Fig. 4.

Transcranial alternating current stimulation (tACS) reduces blood oxygen level-dependent (BOLD) adaptation more in left human motion area (hMT+) than in right hMT+. In these data from an individual subject, color maps show the amount of BOLD adaptation (α^DS) per voxel (see materials and methods). Images are in radiological convention. White crosshairs in the coronal and sagittal slices are at Talairach (x, y, z) coordinates (40, −72, −7). Adaptation in hMT+ of the left hemisphere, which received a twofold stronger electric field, was much less pronounced than adaptation in the right hemisphere.