Final answer:
In a variable ratio reinforcement schedule, the number of responses needed for a reward varies. In a fixed ratio reinforcement schedule, there is a set number of responses that must occur before the behavior is rewarded. Reinforcements should be thinned gradually by increasing the number of responses required for each reinforcement.
Step-by-step explanation:
In a variable ratio reinforcement schedule, the number of responses needed for a reward varies. This schedule is characterized by unpredictability and a high and steady response rate.
Considering your question about thinned reinforcements, if the schedule is based on a specific number, you might be referring to a fixed ratio reinforcement schedule. In this schedule, there is a set number of responses that must occur before the behavior is rewarded. For example, if a reinforcement is delivered after every 5 responses, the reinforcements should be thinned by gradually increasing the number of responses required for each reinforcement.
Thinning the reinforcements on a fixed ratio schedule helps to gradually strengthen the behavior and make it more resistant to extinction. If the reinforcements are thinning too quickly, there is a risk of the behavior extinguishing.