Used in teaching and proper use of reinforcers, fixed ratio is a way to describe how many responses a learner must do before a reinforcer is given.  For example, a FR-10 suggests that the learner must do 10 responses first after which the 10th correct response will be reinforced. Behaviors on a FI scheduled show a typical pattern in which the learner pauses after the presentation of the reinforcer and once again starts performing the behaviors required by the schedule. The larger the size of the ratio, the “faster” a learner performs the behaviors in order to “reach” the requirement faster.

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