[The perception of direction during counterrotation of the head and trunk].

Investigations of perception of the "straight forward" direction and a visual target have been carried out with the use of a unique test facility providing negative feedback between horizontal rotations of the head and the chair. Administration of tests with visible or screened hand demonstrated a deviation of subjective axis "straight forward" from the body median by 13 degrees during synchronous but diversely directed rotations of the head and the chair. Under the same test conditions hand movements towards the target were highly precise. The results show a weak interrelation of egocentric head and body directions.