title: Power spectra for ocular drift and tremor.
abstract: Eye position during fixation has been measured without contact and the power spectrum of drift and tremor eye movements has been estimated. In the 0-40 Hz frequency range power declines with frequency roughly as 1/f2. In the 40-100 Hz frequency range the dominant spectral component is a broad spectral peak with a peak amplitude of about 6 arc sec. The shape of the broad spectral peak is dependent on the fixation direction. A model that explains qualitatively the shape of the power spectra function is presented. It is suggested that tremor eye movements are by-products of the clock-like firing of motor neurons.
mesh_terms: D005133:Eye Movements; D005403:Fixation, Ocular; D006801:Humans; D008954:Models, Biological; D012438:Saccades; D013997:Time Factors