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K

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see OPERANDUM.
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Any manipulable object, the movement of which closes or breaks an electrical circuit. In experiments with pigeons, a useful key is a translucent disk at a convenient height on the wall of the experimental box. When the pigeon pecks this disk, a circuit is made or broken. In experiments with rats, a horizontal bar parallel to and approximately inch from the wall of the experimental box can be pressed downward against a light spring to close or break the circuit.
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A hinged plate which produces an electrical pulse when moved is called a key. In experiments with pigeons, a translucent disc at a convenient height on the wall of the experimental box is frequently used as a key. When a pigeon pecks this disc, the movement operates an electrical switch. A spring returns the hinged plate to the unoperated position. In experiments with rats, a horizontal bar, parallel to the wall of the experimental space, closes the switch against the pressure of a light spring.
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Light projected upon the translucent pigeon key, used as a stimulus. Lights of different colors or patterns may be used.
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(plural. kineses). Undirected movement that depends on stimulus magnitude (as when the random movements of an insect larva increase with light and stop when it reaches the dark).
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PROPRIOCEPTIVE
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A deviation from a smooth curve, often seen in the early acceleration of interval or ratio segments, consisting of a brief period of rapid responding followed more or less abruptly by a compensatory low rate which restores the curve to an extrapolation of the earlier portion. Opposite of bite (q.v.).
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A kind of feedback, usually verbal, given during human performance in various tasks (e.g., verbal learning, motor skills).
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See KNOWLEDGE OF RESULTS.