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Monkeys' viewing behavior to various 2-dimensional displays provided by slides and motion pictures was studied by a paired-comparison testing technique. The number of times and the total duration of time that S viewed each display in a 2-window cubicle were recorded automatically. Monkeys spent more time (p < .01) viewing motion pictures that were (a) in focus, (b) brightly illuminated, (c) moving at normal rather than slower rates, (d) in color, and (e) spatially oriented in the proper manner. They watched automatically changing slides more than stationary slides (p < .01). The duration of individual viewing responses contributed more to total viewing time than did the number of viewing responses.

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