By the application of cognitive technique, aversive stimulus and positive nonverbal reinforcement, an attempt was made to control thumb-sucking behavior of a school girl in a Grade 4 classroom. During the first baseline period, thumb-sucking occurred on the average 63% a class-session but decreased on an average of 12% after treatment. With reinstatement of baseline conditions, it rose to an average of 54%, but after second experimental phase decreased to a mean of 5.1%. No recurrence appeared during the last days. Use of multiple treatment conditions limited interpretations.
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