Question

which of the following is true of a variable-interval schedule in operant conditioning?

○ it reinforces the first behavior after a fixed amount of time has passed.

○ it rewards behaviors an average number of times but on an unpredictable basis.

○ it reinforces a behavior after an inconsistent and unpredictable amount of time has elapsed.

○ it reinforces a behavior after a set number of behaviors.

Explanation:

• Option 1: Fixed - interval (not variable - interval) reinforces after fixed time. Eliminate.
• Option 2: Describes variable - ratio (rewards based on average number of behaviors), not variable - interval. Eliminate.
• Option 3: Variable - interval schedule reinforces behavior after inconsistent, unpredictable time. Correct.
• Option 4: Describes fixed - ratio (reinforces after set number of behaviors). Eliminate.

Answer:

C. It reinforces a behavior after an inconsistent and unpredictable amount of time has elapsed.