Parietal Alpha tACS Shows Inconsistent Effects on Visuospatial Attention, 2018-2019

We aimed to build on research using transcranial alternating current stimulation (tACS) to modulate visuospatial attention. The goal was to replicate previous findings that lateralized parietal tACS at alpha frequency induces a change in attention bias away from the contra- towards the ipsilateral visual hemifield. 40 healthy participants underwent tACS in two separate sessions where either 10 Hz tACS or sham was applied via a high-density montage over the left parietal cortex at 1.5 mA for 20 min, while performance was assessed in an endogenous attention task. Resting electroencephalography was recorded offline immediately after each session.