Distance estimation in the hooded rat: experimental evidence for the role of motion cues.

The role of motion cues, generated by vertical head movements, in distance estimation by hooded rats was investigated in a jumping task in which animals were trained to jump randomly varying gaps between two elevated platforms. In the first experiment it was shown that the disposition of texture cues influenced the number of head movements made prior to jumping, showing that the movements are related to visual aspects of the task. In the second experiment it was shown that stroboscopic illumination disrupted accurate jumping but animals could jump accurately to a platform when only the leading edge was visible, showing that they depend on motion cues but not motion parallax.