| Abstract: | Five different performance-based treatments (participant modeling, participant modeling without therapist physical contact, modeling plus exposure, therapist-controlled exposure in vivo and rationale only) were compared to evaluate their relative effectiveness in the treatment of acrophobia. Ten subjects were assigned to each of the five groups. Avoidance behavior was assessed using a behavior test, self-report fear measures, heart-rate and self-efficacy expectation measures. Subjects were first submitted to two behavioral approach tests. These two pre-tests were administered 1 week apart, and no significant differences occurred between the evaluations. Analyses of variance for repeated measures at pre-test. post-test and follow-up revealed a significant improvement on all main outcome measures for the five groups. No significant differences among groups were observed. The total treatment time, which was also used as a dependent measure, did not yield any significant differences among treatment conditions. These findings have many implications. For instance, the need for induction aids, such as physical contact with the therapist and modeling, is questioned. Also, exposure per se whether therapist or self-controlled is shown to be effective in reducing avoidance behavior. Finally, the theoretical and clinical implications of these results are discussed. |
