At first, Matt used a continuous schedule of reinforcement and then switched Buster to a fixed ratio schedule of reinforcement, as explained below.
A continuous schedule of reinforcement means rewarding the desired behavior every time it happens. That is what Matt was doing at first, since he would give Buster a biscuit each time the dog sat when commanded.
A fixed ratio schedule of reinforcement means rewarding the desired behavior only after its taking place a certain number of times. In this case, Matt decided that Buster should sit three times before it could get a biscuit.
With the information above in mind, we can say Matt used a continuous schedule of reinforcement and then switched Buster to a fixed ratio schedule of reinforcement.
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