Deprivation is defined as which of the following?

• A. The period since the last reinforcer ends
• B. A schedule of reinforcement
• C. A motivational operation
• D. The state of an organism with respect to how much time has elapsed since it consumed or contacted a reinforcer

Answer: (D)

Deprivation is the organism’s current state regarding access to a reinforcer, defined by how long it has been since it last consumed or encountered that reinforcer. This elapsed time makes the reinforcer more valuable and increases its effectiveness, which in turn makes the behavior that produces that reinforcer more likely to occur. The longer the period without the reinforcer, the greater the deprivation, and the stronger the reinforcer’s impact. While deprivation is a type of motivational operation, the precise definition centers on this time-since-last-reinforcer status. The other options miss that specific time-based state or refer to broader concepts like reinforcement schedules or motivational operations without capturing this definitional focus.