To successfully shape roll behavior in Exercise 47,
a. it was necessary to continue to reinforce both precursor behaviors and the target behavior each time they occurred.
b. each precursor behavior was no longer reinforced once it occurred with sufficient frequency.
c. reinforcement was withheld following the first precursor behavior once it occurred frequently enough and always followed the second precursor behavior.
d. reinforcement was withheld following the second precursor behavior once it occurred frequently enough but continued always to follow the first precursor behavior.
b. each precursor behavior was no longer reinforced once it occurred with sufficient frequency.
Answer feedback: The procedure for successfully shaping roll behavior discontinued reinforcement for the genital-grooming response once it became frequent. The procedure also discontinued reinforcement for the head tuck after the first 50 rolls (or thereabouts) had occurred.
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