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fixed-ratio
reinforces a response only after a specified/set number of responses
EX: coffee shop rewards a free drink after every 10 purchased.
variable-ratio
reinforces a response after an unpredictable number of responses
EX: slot machines
fixed-interval
reinforces a response only after a specified/set time period has elapsed
EX: checking for college acceptance the week they’re supposed to release.
variable-interval
reinforces a response at unpredictable time periods
EX: finally getting a text you’ve been waiting for after constantly checking
Note 
Flashcard (20)