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Stromatolites are rocklike columns composed of:
Variable-interval
A reinforcement schedule where a response is reinforced after a variable and unpredictable time interval has occurred.
Variable-ratio
A schedule of reinforcement where a response is reinforced after an unpredictable number of responses. This schedule creates a high steady rate of responding.
Fixed-ratio
A schedule of reinforcement where a response is only reinforced after a specific number of responses, common in behaviorist psychology.
Fixed-interval
A schedule of reinforcement where the first response is rewarded only after a specified amount of time has elapsed.
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