Kittens and infant chimpanzees were presented with a disc which rotated or was stationary. Both initiating and stopping rotation increased the probability of eye fixations over a control condition, with the effect greater for initiation. The rotating disc was fixated more than the stationary disc in both animal groups. The curves describing reduction of fixations on the rotating and the stationary disc were parallel for the chimpanzees and diverged for the kittens.
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