Oscillatory depth as a function of temporal frequency.
The percept of oscillatory motion in depth was generated by a luminance modulation of a sinusoidal nature induced within each dot pair of a stationary random assembly of paired dots. The dots were miniature sources of polarized light viewed through a rotating ocular polarizer, which facilitated both the percept of oscillations and the modulation of luminance at any desired frequency. Depth responses were studied as a function of frequency within the 0-2 Hz range. A strong amplitude decrease was noticed at a mean frequency of f(1)=0.81 Hz; oscillations were perceived as 'rectified' for f > f(1) with an additional minimum of crossed-disparity depth at f(2)=1.60 Hz. It is suggested that the intensity modulation of the light beams mapping the stationary stimuli onto the retinae was a likely factor responsible for the observed depth minima and the rectification of faster oscillations. Results are compared to those obtained in a traditional setting, where the percept of oscillations in depth had been generated by disparity variations due to lateral motion of the stimuli.
Shore
Harold
H
Florida International University, College of Arts & Sciences, 3000 N.E. 151 St., North Miami, FL 33181, USA.
Shore
Minna
M
D003290:Convergence, Ocular; D003867:Depth Perception / Q000502:physiology*; D005123:Eye / Q000528:radiation effects*; D006801:Humans; D008027:Light; D010775:Photic Stimulation / Q000379:methods; D013997:Time Factors; D015357:Vision Disparity