Improvent of the PANSS score within the period of 2 - 4 weeks from screening to the baseline

Pregnancy

Bronchial asthhma in medical history

clinically relevant internistic, neurological or psychiatric diseases

abuse of drugs or alcohol until 4 weeks to enrollment

Traumatic brain injury in medical history as well as invasive and non-invasive methods of treatment (e.g. tumor surgery (Gammma knife surgery))

indication of structural impairment of the basal ganglia or the brain stem

malformations of the pinna

further circumstances that at the discretion of the investigator will not allow to include the subject into the clinical study

Transcutaneous Non-invasive Vagus Nerve Stimulation (t-VNS) in the Treatment of Schizophrenia