Classifier Instance:

Anchor text: B. F. Skinner
Target Entity: B\u002e_F\u002e_Skinner
Preceding Context: Simple telegraph-like keys were long used to control the flow of electricity in laboratory tests of electrical circuits. Often, these were simple "strap" keys in which a bend in the key lever provided the key's spring action. Telegraph keys were once used in the study of operant conditioning with pigeons. Starting in the 1940s, initiated by
Succeeding Context: at Harvard University, the keys were mounted vertically behind a small circular hole about the height of a pigeon's beak in the front wall of an operant conditioning chamber. Electromechanical recording equipment detected the closing of the switch whenever the pigeon pecked the key. Depending on the psychological questions being investigated, keypecks might have resulted in the presentation of food or other stimuli. Modern pigeon response keys are specially made switches but are still called "keys" due to their origins as telegraph keys.
Paragraph Title: Non-telegraphy uses of keys
Source Page: Telegraph key

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