Effects of alternative control procedures for electromyographic biofeedback relaxation training

Area of Science:

• Psychology
• Neuroscience
• Rehabilitation

Background:

• Biofeedback relaxation training research often uses various control procedures.
• Electromyography (EMG) biofeedback is a common technique for relaxation training.

Purpose of the Study:

• To compare the effectiveness of three experimental control procedures in EMG biofeedback relaxation research.
• To determine the most suitable control procedure for future EMG biofeedback studies.

Main Methods:

• Twenty-four college students were divided into three groups: contingent EMG biofeedback, single-blind noncontingent feedback, and yoked control.
• Electromyographic activity was measured from the forehead area.
• Subjects received different feedback conditions and instructions related to relaxation.

Main Results:

• The contingent EMG biofeedback group demonstrated significantly lower EMG activity than both control groups.
• No significant EMG level decrements were observed from the beginning to the end of the session for the contingent group.
• The single-blind group exhibited significantly larger data variance compared to the other groups.

Conclusions:

• Contingent EMG biofeedback appears effective in reducing muscle activity, but methodological considerations are crucial.
• The yoked control procedure is recommended as the preferred method for EMG biofeedback relaxation research.
• Findings support a "probing" hypothesis over the "frustration" hypothesis in explaining biofeedback effects.