Abstract
Modified operant-conditioning boxes were specifically developed with retractable bars to introduce discrete-trial methodology into the operant-conditioning box. The apparatus can also be used with orthodox free operant procedures. The boxes are incorporated into a system utilizing Jones plugs for automatic programming and paper-tape punches and an IBM 024 Card Punch for automatic data collection. Simulation of T-maze (choice) as well as runway situations is possible by the use of multiple bars and magazines. The present report describes the major components, the programming and data-collection systems, and the experimental programs possible with the apparatus.
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