Abstract
Eye fixations upon a visual stimulus are maximal immediately after the presentation of the stimulus, and they decline regularly during the following minute. Five infant chimpanzees were used in three experiments to test the hypothesis that the character of a stimulus affects the level, but not the shape of the eye fixations curve. In each experiment, stimuli were presented for 1 min., and the durations of each fixation and the periods between fixations were recorded. In the first experiment, the stimuli were lights flickering at 10, 30, 60, and 90 flashes per second. In the second experiment, lights of three different intensities were used, and in the last experiment, discs rotating at 0, 30, and 60 rpm were the stimuli. The main hypothesis was supported. The results also indicated that the decreasing curve in eye fixations was partly a function of an initial fixation occurring immediately after the presentation of the stimulus and partly due to a reduction in duration and concentration of fixations in succeeding seconds.
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