Algorthms for the Analysis of the Nystagmic Eye Movements Induced by Sinusoidal Head Rotations

A digital computer program has been developed for analysis of the nystagmus which results from sinusoidal head rotation. For any sinusoidal vestibular stimulation between 0.05 Hz and 1 Hz, the program, accepts sampled records of eye position and head velocity and yields cumulative eye position as well the phase and the gain of the vestibuloocular reflex. Described in this paper are new algorithms by which fast phases are detected and by which slow phase cumulative eye position is reconstructed using and iterative procedure of best least squares fit. These algorithms are useful in neurophysiological studies on normal animals, but not in clinical analysis of nystagmus.