Effects of an oral hygiene punishment procedure on chronic rumination and collateral behaviors in monozygous twins.

This study investigated the suppressive effects of an oral hygiene punishment procedure on the ruminative behavior of profoundly retarded monozygous twins. Rumination, fingers in mouth/tongue out, appropriate behavior, and stereotyped behavior were measured before and during treatment with oral hygiene. Treatment was introduced for each meal in succession across the twins in a multiple-baseline design. Results showed that the rate of rumination of both twins was dramatically reduced to very low levels and stereotyped behavior increased spontaneously with the introduction of oral hygiene. Maintenance data showed that response reduction was maintained over a six-month period and, when compared to baseline levels, increased rates of socially appropriate behavior were evident in both children.