Abstract
This report details steps for constructing two switches that have been used successfully in operant studies with both rhesus macaques and human infants (Borrebach, Abernathy, Wyrick, & Vietze, Note I; Borrebach & Wilcoxon, Note 2). The bidirectional lever is for panel mounting; the chain response device is designed to be mounted in an overhead position. The lever was con structed because a commercially available omnidirec tional lever failed to stand up to the rigors of experi mentation with large primates, and it quickly became unreliable. The unit described here is rugged and does not produce a spurious series of switch closures when given hard glancing blows. The chain response manipu landum was designed because of the lack of a suitable commercial device for primates. Both switches meet three design criteria: (I) ease of construction, (2) low cost, and (3) positive stop action. The last feature prevents destruction of the switch due to over-travel, which subjects the switch to undue pressure.
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