EFFECT OF VISUAL PERCEPTION AND PREDICTABILITY ON HEAD STABILIZATION DURING PERTURBATION IN HUMANS

SATO YUJI, WATANABE NOBUHIRO, HASHIBA MOTOYUKI, TANAKA CHIKAKO, KABAYA KAYOKO, TAKEMURA KEIJI, NAKAYAMA MEIHO, MURAKAMI SHINGO

Dynamic properties of the head stabilization in healthy humans were studied during angular rotation in the horizontal plane. The subjects were 14 healthy subjects, average age 32.5 years, range 27-47 years, with no previous history of vestibular disease. Subjects were seated in a rotational chair mounted on a servo-controlled table. The chair was rotated horizontally in two ways, sine stimulation and pseudorandom stimulation. In the sine stimulation, the motor operated with flequencies of 0.4, 0.8, and 1.6Hz, angles of ±4, ±8, and ±16degrees, and angular velocities 40, 80, and 160degrees/second. In the pseudorandom stimulation, the freqencies, degrees of amplitude, and angular velocities were the same, moving according to sum of sines. The result of gain was calculated from the head movement with respect to the chair movement. Result of sine stimulation revealed average gain from 0.4 to 1.6 Hz 0.91〜0.97. Gain of imaginary target was 0.83〜0.97. There was no significant difference between the results of gaze and imaginary target condition in both sine and pseudorandom condition. The gain was significantly smaller with pseudorandom stimulation in both the gaze condition imaginary target condition than in the sine stimulation group (P<0.05). This result suggests that predictability of movement involves higher levels of nervous function because gain in the pseudorandom stimulation condition was significantly smaller than in the sine stimulation group in our study.

EFFECT OF VISUAL PERCEPTION AND PREDICTABILITY ON HEAD STABILIZATION DURING PERTURBATION IN HUMANS

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