Abstract
Pigeons were exposed to optokinetic stimulation in the plane of the horizontal semicircular canals with an angular velocity of 10°/sec with normal head orientation in space during lateral tilting by 30° (dynamic tilting), after tilting (static tilting), and during rotation of the head to the initial position. No differences were seen in the effects of dynamic and static tilting on optokinetic and post-optokinetic nystagmus. Both types of tilting could induce both weakening and activation of oculomotor reflexes. There was no strong relationship between the direction of tilt and the sign of changes in the response. These data contradict the hypothesis of gravity-related changes in the time constant of the “velocity accumulator” as the sole cause of changes in optokinetic and post-optokinetic responses in conditions of dynamic and static tilting.
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