operandum

English

Etymology

From Latin operandum. Doublet of operand.

Noun

operandum (plural operanda)

1. A lever, key or device installed in an operant chamber, upon which the "subject" exerts its responses. Sometimes referred to as a manipulandum. In the prototypical operant conditioning experiment, a rat (the subject) presses upon a lever (the operandum) which triggers the delivery of food (the reward or reinforcer).

Related terms

• modus operandum

Latin

Participle

operandum

1. inflection of operandus:
   1. nominative/accusative/vocative neuter singular
   2. accusative masculine singular