A variable-interval schedule of reinforcement is one in which a response is reinforced only after a(n)

A) specified amount of time has elapsed.
B) unpredictable number of responses has been made.
C) specified number of responses has been made.
D) unpredictable amount of time has elapsed.

Unpredictable

not able to be predicted or foreseen, often because of constant changes or lacking a pattern.

Variable-Interval

A timetable for reinforcement where the time intervals between receiving reinforcement vary around a certain average but are unpredictable.

Reinforcement

A principle in behavioral psychology where an outcome or consequence of a behavior increases the likelihood of that behavior occurring again in the future.