Ocular-following responses to white noise stimuli in humans reveal a novel nonlinearity that results from temporal sampling

摘要: White noise stimuli are frequently used to study the visual processing of broadband images in laboratory. A common goal is describe how responses derived from Fourier components image. We investigated this issue by recording ocular-following (OFRs) white human subjects. For a given speed we compared OFRs unfiltered with those filtered band-pass filters and notch filters. Removing low spatial frequency (SF) reduced OFR magnitudes, SF associated greatest reduction matched that produced maximal response when presented alone. This declined rapidly SF, compatible winner-take-all operation. higher increased magnitudes. speeds effect became larger propagated toward lower SFs. All these effects were quantitatively well described model combined two factors: (a) an excitatory drive reflected individual (b) suppression channels where temporal sampling display led flicker. nonlinear interaction has important practical implication: Even high refresh rates (150 Hz), introduced displays significant impact on processing. instance, show distorts tuning curves, shifting peak speeds. Careful attention spectral content, light nonlinearity, necessary minimize resulting artifact using patterns undergoing apparent motion.