Increased input to visual brain w/development - cones become thinner, closer together, and outer segments lengthen. Preneural mechanisms constrain chromatic discrimination in human neonates and discrimination failures may reflect poor visual efficiency rather than immature chromatic mechanisms per se.
Yuodelis and Henrickson (1986)
Development of fovea pit responsible for high resolution, sensitive, central vision. Foveolar width and cone diameter at adult levels by 45mo but outer segment length and cone packing density only 1/2 adult value.
Braddick and Atkinson (2011)
The cortex needs to mature before fine discrimination of orientation develops. The amount of noise tolerated by 2-3 month old's is poor compared to adults. Global form measurements claim to tap ventral (what) stream processing and develop at different rates to global motion measurements which claim to tap the dorsal (where/how) stream processing. Asynchronies in development of these 2 pathways may be related to their differential vulnerability in both acquired and genetic disorders.
At 7-12 weeks infants can integrate local motion into a global representation of motion.
Feller et al. (1996)
Highly correlated neural activity in the form of spontaneous waves of AP's is present in the developing retina weeks before vision. These waves consist of spatially restricted domains of activity that form a mosaic pattern over the entire RGC layer. Synaptic input to the RGC comes from cholinergic amacrine cells.
Atkinson et al. (1977)
All parts of the contrast sensitivity curve change w/age: birth - 10 weeks: improves at all SF's; until 4yo: rapid improvement at high SF; and until 9yo: slower improvement at low SF.
Adams, Maurer, and Davis (1986)
Newborns differentiated grey from green, yellow, and red - preferred chromatic-grey checkerboards over grey squares matched in mean luminance. At some luminances, newborns showed no preference for a blue and grey checkerboard over a grey square, and habituation to a grey square results in increased looking times at a red but not a blue square. Suggests newborns are at least dichromats.