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Abstract
The spontaneous position taken up by the eyeballs after closure of the lids has been studied in 50 normal subjects.
In 100% of the cases there was initially an elevation of the eyes which, however, after some seconds was followed by depression. Subsequently there was reflex activity varying from person to person but not from occasion to occasion in the same person. In 80% of the subjects vertical nystagmus upwards was observed; in 6 % the vertical nystagmus was directed downwards; and in 14% there was no nystagmus but instead vertically undulating eye movements.
On these grounds the practice of recording vestibularly induced vertical nystagmus behind closed lids is deprecated.