Trunk-ocular reflex in man

The experiments were designed to determine whether twisting of the trunk induces eye movements in man. The subject's head and neck were fixed firmly, and the chair in which the subject sat was turned along a vertical axis sinusoidally at about 1 4 Hz . It was found that the eye deviated horizontally in a direction counter to the twisting of the lower trunk. This ocular movement was accompanied by nystagmus. The gain (the ratio of ocular movement to chair movement) of the trunk-ocular reflex appeared to be about 0.5 with time lag of around 80 msec.