Answer:
A variable-ratio schedule
Explanation:
A variable-ratio schedule is a schedule of reinforcement where a response is reinforced after an unpredictable number of responses. This schedule creates a steady, high rate of responding. Gambling and lottery games are good examples of a reward based on a variable ratio schedule.
Schedules of reinforcement play a central role in the operant conditioning process. The frequency with which a behavior is reinforced can help determine how quickly a response is learned as well as how strong the response might be.
Style of playing used by woodwind players

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Musical Instruments: History, Technology, and Performance of Instruments of ...
By Professor of Musical Acoustics Murray Campbell, Murray Campbell, Clive A. Greated, Arnold Myers, Senior Lecturer in Music and Director Arnold Myers
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