B. F. Skinner
Schedules of reinforcement

Skinner recognized that behavior is typically reinforced more than once, and, together with Charles Ferster, he did an extensive analysis of the various ways in which reinforcements could be arranged over time, calling it the schedules of reinforcement.

The most notable schedules of reinforcement studied by Skinner were continuous, interval (fixed or variable), and ratio (fixed or variable). All are methods used in operant conditioning.
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