Motion thresholds in infants to sinusoidal gratings.
Motion thresholds were determined at 9 degrees eccentricity in infants (mean = 14 weeks old). The stimuli used were computer-generated sinusoidal gratings presented through a 7.45 degrees aperture at a contrast ratio of .83. The range of velocities (.5, 1, 2, 4, and 6 degrees per s) was examined at only one spatial frequency (1 cycle per degree). At low velocities (less than 2 degrees per s), the infants showed no clear preference for the moving stimulus over the stationary stimulus. At faster velocities (2-6 degrees per s), the infants exhibited a clear preference for the moving stimulus. The results were interpreted as indicating that infants at 3 months of age are relatively insensitive to slow motions for low spatial frequency stimuli.
Finlay
D C
DC
Department of Psychology, University of Newcastle, Australia.
Chorlton
M C
MC
Boulton
J C
JC
D000367:Age Factors; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D007223:Infant; D008297:Male; D009039:Motion Perception; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D012684:Sensory Thresholds; D014792:Visual Acuity