Performance related decrease of brain activity during and after stimulation.

<p>Activity decreased with time for contrast <i>run1-run2</i> in the paracingulate gyrus, superior frontal gyrus, thalamus and hippocampus. (Z>3, P<0.05, corrected).</p

Regions of decreased activity for hf-tRNS.

<p>Contrast <i>sham- Hfreq</i> (A) revealed changes in the left frontal cortex. Contrast <i>Lfreq-Hfreq</i> (B) revealed additional changes in right frontal cortex and precuneous.</p

Peak voxel intensity and coordinates for brain regions showing motor task-related activity.

<p>Peak voxel intensity and coordinates for brain regions showing motor task-related activity.</p

Peak voxel intensity and coordinates for brain regions showing performance-related activity.

<p>Peak voxel intensity and coordinates for brain regions showing performance-related activity.</p

Motor task-related decrease of brain activity during and after stimulation.

<p>Activity decreased with time for contrasts <i>run1-run2</i> (A) in primary and premotor cortices, supplementary motor area (SMA), prefrontal cortex, occipital cortex, thalamus and basal ganglia and <i>run2-run3</i> (B) in the precuneous, superior parietal cortex, middle and inferior frontal gyrus, right prefrontal cortex, left inferior LOC and basal ganglia (Z>3, P<0.05, corrected).</p

Changes in tracking error relative to the first trial.

<p>Shaded area corresponds to the stimulation period. Fifth Polynomial trendlines are superimposed on the data for easier visualization.</p