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2nd session added counter appears approximately arrow begins behavior bird showed blue key body-weight chain clock color continues daily session decline differential reinforcement drl contingency effect emitted experiment extinction curve fairly FIFR Figure final performance fixed ratio fixed-interval fixed-ratio schedule following session following the reinforcement forcement formance high rate higher rate immediately after reinforcement increase inforcement intermediate rate interpolation interval schedule interval segments intervals show key-color linear long pause low rate lower rate marked ment MINUTES Fig multiple schedule negative acceleration negative curvature number of responses occasional pause after reinforcement period pre-aversive stimulus preceding produces rate of responding ratio performance ratio rate Record B shows rein responses occur responses per second rough grain running rate schedule of reinforcement second bird session Record short ratio shown in Fig slit sodium pentobarbital sponses stable performance stimulus control sustained tand transition from crf variable-interval water magazine zero