Residents of facilities such as biogas, combined heat and power plants or wind turbines increasingly report impairments due to supposed infrasound. Often reference is made to a protection level which has been perceived as inadequate. A stronger limitation of emissions is demanded and linked to a broad range of clinical pictures. Previous studies on infrasound exposure and physiological human responses yielded mixed results.In a project of the German Federal Environmental Agency, in five 30 min-sessions (one rest scenario) 42 healthy and normal hearing subjects were treated with infrasound at the hearing threshold level. In these scenarios the wake-EEG, ECG, EOG, EMG and the blood pressure were measured and the equilibrium organ was tested. The data sets of 39 subjects (21 female / 18 male) could be evaluated. 16 of these subjects (10 female / 6 male) had already complained about infrasound before and this had already been recorded in their living environment. The age of the subjects was between 21 and 61 years (M 46.9, SD 11.0). The methodology of the study and first results are presented.The acoustic installation (Krahé et al.) and annoyance results (Schreckenberg et al.) will be presented in further lectures at this conference session.