Abstract
Long-Evans rats reared under various conditions and later tested for a preference between surfaces presented at different distances responded discriminately as follows: 1. 1. Light- and dark-reared rats chose the near surface when given a choice between near and far surfaces. 2. 2. Rats reared in light before a near surface chose that same surface when given a choice between it and a far surface. However, if reared before a far surface, the rats did not show any significant preference when given a later choice between this same surface and a near one. It appears that some early visual experience affects later behaviour. 3. 3. Light- and dark-reared rats, when given a choice between near or far with the visual cue of motion parallax present and that of proximal size absent, chose a near over a far surface. Apparently motion parallax can operate without learning to produce differential behaviour. 4. 4. Light- and dark-reared rats did not show any significant preference for either surface when the texture density of the surfaces was different but the distance was equal. It appears that proximal size is not an effective differential stimulus for preference behaviour in the horizontal plane for hooded rats.
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