Topic: relative phase

Despite the widespread use of transcranial alternating current stimulation (tACS) as a non-invasive brain stimulation technique, it remains challenging to study online neural effects of tACS due to stimulation artifacts. Here, we exploit neural nonlinearities to account for artifacts and reveal online neural effects of tACS. First, we provide a linear model that predicts the brain response to tACS. We then show that magnetoencephalography (MEG) measurements during tACS deviate from the predictions of this model. Specifically, we measured brain activity in human subjects either during 10 Hz vis