FPL and VEP measures of fusion, stereopsis and stereoacuity in normal infants.
Dynamic random dot fusion, stereopsis and stereoacuity were evaluated in 149 healthy, fullterm infants, using both forced-choice preferential looking (FPL) and steady-state visual evoked potential (VEP) protocols. Few infants aged 2-3 months demonstrated fusion or stereopsis in either the FPL or VEP protocol; most infants aged 5 months and older demonstrated fusion and stereopsis in both protocols. Both FLP and VEP stereoacuity approached adult-level (< 60 sec) by 6-7 months of age. Both infants and adults exhibited non-monotonic VEP amplitude vs disparity functions with a step change in phase at an intermediate disparity, consistent with separate fine and coarse disparity mechanisms.
Birch
E
E
Retina Foundation of the Southwest, Dallas, TX 75231, USA.
Petrig
B
B
D000375:Aging / Q000502:physiology; D002657:Child Development / Q000502:physiology*; D003118:Color Perception / Q000502:physiology; D003867:Depth Perception / Q000502:physiology*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D007223:Infant; D010364:Pattern Recognition, Visual / Q000502:physiology; D011601:Psychophysics; D012016:Reference Values; D015357:Vision Disparity / Q000502:physiology*; D015348:Vision, Binocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology