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  • Fixed ratio reinforcement (FR) is a schedule of reinforcement in operant conditioning where there is reinforcement after a fixed number of responses have been made (maintaining a fixed ratio between response rate and reinforcement rate).
    • Example: FR2 = every second response is reinforced
    • Lab example: FR5 = rat reinforced with food after each 5 bar-presses in a Skinner box.
    • Real-world example: FR10 = Used car dealer gets a $1000 bonus for each 10 cars sold on the lot.

Continuous reinforcement is FR 1

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