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The vision of infants under one month of age ranges from 6/240 to 6/60 (20/800 to 20/200). [4] By two months, visual acuity improves to 6/45 (20/150). By four months, acuity improves by a factor of 2 – calculated to be 6/18 (20/60) vision. As the infant grows, the acuity reaches the healthy adult standard of 6/6 (20/20) at six months. [5]
The infant learns to coordinate vision and comprehension. Actions are intentional, but the child tends to repeat similar actions on the same object. Novel behaviors are not yet imitated. [8] 8–12 months: Coordination of secondary circular reactions – This is deemed the most important for the cognitive development of the child. At this stage ...
Vision and hearing Social 1–1.5 months ... Sensory development. Focuses on things about 8 to 12 inches (20 to 30 cm) away. [22] Eyes wander and may cross. [22]
By about 8–12 months, they go through a fairly rapid change and become fearful of perceived threats. [113] By around 6–36 months, infants begin to prefer familiar people and show anxiety and distress when separated from them, and when approached by strangers. [114] Separation anxiety is a typical stage of development to an extent.
Robert Lowell Fantz [1] (1925–1981) [2] was an American developmental psychologist who pioneered several studies into infant perception. In particular, the preferential looking paradigm introduced by Fantz in the 1961 is widely used in cognitive development and categorization studies among small babies.
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Other accounts deal with the development of planning, reaching, and deciding things. There are also behaviorist accounts that explain the behavior in terms of reinforcement. This account argues that the repeated trials with hiding the toy in box "A" is reinforcing that specific behavior, so that the child still reaches for box "A" because the ...
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