[Changes in rigidity of the internal ear in body tilt].

We tried to select information concerning changes in acoustic rigidity of the internal ear in 90% body tilt from tympanogram. In such conditions there is no correlation between a 10-fold rise of perilymph pressure and tympanogram parameters. This contradiction suggests that rigidity of tympanogram is a total of rigidity of the ear canal part, middle and internal ear; that inert rigidity of the middle ear in body tilt masks a weak dynamic component of the internal ear.

[The impact of long-term isolation on visual acuity].

During the experiment with 90- and 7-day isolation and confinement tests were applied to evaluate, along with static, expositional and dynamic (DVA) visual acuity using automated system VZGLIAD (Gaze). Test distance was 1 meter. To assess DVA, the subjects were requested to make oscillatory movements with the head in the horizontal plane with a metronome frequency at 1 Hz.

[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.