![]() ![]() After adaptation, the corresponding values in the same population were 53%, 18% and 71% respectively. Before adaptation, the cumulative slow-phase and cumulative saccadic components produced on average 78% and 14% respectively of the ideal (100%) compensation, thus yielding an overall net compensation which was 92% of the desired value. The adaptive experience comprised 2 h of full-field visual suppression of the VOR during sinusoidal rotation of subject and surround at 1/6 Hz and 40°/s velocity amplitude. In each test series, subjects attempted to stabilize their gaze on a previously seen target during each of 40 brief (≈0.5 s) whole body rotations (40°/s, 20° amp) conducted in complete darkness. ![]() The present study further investigates this phenomenon by measuring the respective contributions of saccadic, slow-phase and overall net compensation in 9 subjects tested before and after 30% adaptive attenuation of VOR slow-phase gain. Nevertheless it has recently been found, that even in the dark, this inadequacy tends to be corrected by supplementary saccades usually acting in the compensatory direction. However, slow-phase compensation per se is generally inadequate in these circumstances. When a normal human subject is briefly turned in total darkness while trying to “look” at a spatially fixed target, the vestibulo-ocular reflex (VOR) produces slow-phase compensatory eye movements tending to hold the eyes on target. ![]()
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