Testing of an Interface for Synchronizing tACS-DBS With a Phase-locked-loop

Summary

The investigators aim to test an interface to phase-lock transcranial alternating current stimulation (tACS) and deep brain stimulation (DBS) for future studies investigating the effects of different time-lags between DBS and tACS on the behavioural and neural level. To test if the interface works in patients with DBS, the investigators record EEG during synchronized tACS-DBS in several patients. The investigators hypothesize that they can apply tACS at the desired phase-lags relative to DBS pul

Eligibility

Inclusion Criteria: * Provision of written informed consent by the patient * Age 35 - 85 * patient groups: Parkinson's disease, essential tremor, dystonia * \>3 months after surgery for DBS Exclusion Criteria: * Epilepsy or history of seizures * Existence of heart pacemaker or other metal implant

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