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Period of deprivation (days)

Figure 14.1. The time (T) to recovery of the first signs of vision on the jumping stand (operationally defined as the ability to jump to a closed door, as opposed to an adjacent open door, by use of visual cues alone) in 17 kittens dark-reared from birth for the period (t) shown. The increase of T with t has been fitted by the following function: T = 0.067t12. (Redrawn from Mitchell, 1988a.)

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