Abstract

Monkeys were partially surrounded by opaque screens except for some distant small holes through which they observed various stimuli or actions, or well-defined background patterns. Gaze direction was measured by an infrared cornea reflection method. Without training or reward, the animal’s gaze was directed through one of the holes for 10–30% of the total time. With holes of appropriately small diameter, the gaze direction can be defined within a range of about 1°. Durations of individual glances through the holes, and dependencies on the nature of the displays are reported. The procedure is suited for the electrophysiological investigation of natural, especially foveal vision.

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