DISCRIMINATORY ABILITY OF PATTERN IN THE CAT:THE EFFECT OF ORIENTATION-FREE PRESENTATION

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The ability of kittens in discriminating length-breadth ratio of geometrical figures was examined with a tracking method. In Experiment I, kittens were trained to discriminate a rectangle from a square, both in free orientation and fixed orientation tasks. In the former task, the spatial orientations of the stimulus figures presented were varied randomly from trial to trial, and in the latter, the orientation of the figures was fixed. The results showed that kittens could discriminate the rectangle with the length-breadth ratio of 1.2:1 (R 1.2) from the square, but failed to discriminate R 1.1 with both orientation tasks. In Experiment II, an ellipse and a circle were used as stimuli, and the area of the circle was varied in three steps in a random order as an irrelevant cue in addition to changing the orientation of the ellipse in the free orientation task. The kittens showed the same discriminatory ability with the free orientation task as with the fixed orientation task. However, the level of discrimination achieved in Experiment II was much lower than that achieved in Experiment I, and possible causes of the difference were discussed.
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