Afternystagmus, its specific features

There are important issues and new observations concerning 'afternystagmus'. Recent findings were mostly supplied by 3-dimensional records of eye movements. 'After-nystagmus' appears to be secondary to the reactions to the visual and vestibular inputs. The beginning of afternystagmus, however, is not always clear, and the distinction from the primary reaction is not clear either. The axis of eyeball rotation during afternystagmus is not necessarily the same as that of the primary reaction, but frequently changes gradually with time. The change in the plane of eyeball rotation during afternystagmus appears to follow a certain rule, which appears to be under specific influences from the otolith organs. Afternystagmus and its related phenomena seem to be explained by a hypothetical 'velocity storage'.