Spatial and velocity tuning of processes underlying induced motion.
A nulling procedure was used to quantify the velocity and spatial frequency tuning of induced motion for sinusoidal gratings. For each spatial frequency of test and inducing gratings, there was a range of low velocities which resulted in strong induction, with a gain of close to 1. For low spatial frequencies induction occurred at higher velocities than was the case for high spatial frequencies. Induced motion shows bandpass spatial frequency tuning, with a bandwidth of about two octaves at half-height. Induced motion appears to be mediated by spatial channels with a low pass temporal characteristic. To a first approximation, induced motion appears to be a product of velocity and spatial frequency.
D005556:Form Perception / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D013997:Time Factors