Frequency Analysis of Smooth Pursuit by FFT
Naoki Ohashi, Yukio Watanabe · Practica oto-rhino-laryngologica Suppl · 1989
The power spectra (PS) of eye movement and of target movement was calculated and the power spectra difference (PSD i. e., ‘PS of eye movement’-‘PS of target movement’) was obtained. In normal subjects whose pursuit patterns were smooth, PSD-f0 [PSD at f0(target frequency)] was greater than PSD-f0↑ (PSD average above f0). On the contrary, PSD-f0↑ is greater than PSD-f0 in pathological (saccadic or ataxic) pursuit patterns. Therefore, we conclude that 1) pathological pursuit patterns contain a frequency higher than the basic frequency identical to the target movements, and 2) a greater PSD-f0 sustains smooth pursuit.