The amount of time that adult rhesus monkeys (N = 10) looked out from an enclosed box through a circular peephole increased with diameter of aperture and decreased with thickness of aperture. Choices between two peepholes were similarly a function of differences in diameter. With rectangular apertures, the horizontal extent was more important than the vertical extent in maintaining looking. Throughout 5 experiments the crucial variable seemed to be the effective area of the available visual field or fields.
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