Continuous Compensatory Tracking by a Cebus Monkey

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Science  29 Sep 1961:
Vol. 134, Issue 3483, pp. 947-948
DOI: 10.1126/science.134.3483.947


A cebus monkey was trained to hold a continuously moving voltmeter needle on-target for 60 seconds to obtain a food-pellet reinforcement. The task confronting the animal was relatively complex in that the high-frequency error voltage fed to the voltmeter needle was nulled by the animal by means of a joystick physically separated from the stimulus display.