Final answer:
Slot machines operate on a variable ratio reinforcement schedule, which is unpredictable and maintains a high rate of response because the exact number of responses required for a reward is unknown.
Step-by-step explanation:
In the context of operant conditioning, reinforcement schedules determine the rate at which behaviors are reinforced. Slot machines reward gamblers according to a variable ratio reinforcement schedule, where the number of responses needed before receiving a reinforcement varies unpredictably. This contrasts with a fixed ratio reinforcement schedule, where a set number of responses must occur before a reward is given, such as a sales commission for selling eyeglasses. A fixed interval reinforcement schedule involves providing a reward after a set amount of time has passed, exemplified by a pain relief medication given at a hospital on a set hourly schedule. In contrast, a variable interval reinforcement schedule is unpredictable in time and strengthens the behavior because the reinforcement could occur at any moment, as seen in the example of random quality control bonuses in a fast-food restaurant.