Estimating the accuracy of muscle response testing: two randomised-order blinded studies

Area of Science:

• Neuromuscular integrity and neural control assessment.
• Diagnostic test accuracy studies.
• Psychophysiological responses to semantic stimuli.

Background:

• Manual muscle testing (MMT) is a clinical assessment tool for neuromusculoskeletal integrity.
• Muscle response testing (MRT), a form of MMT, assesses neural control rather than muscular strength.
• An application of MRT involves assessing patient responses to semantic stimuli, such as spoken statements.

Purpose of the Study:

• To estimate the accuracy of MRT in distinguishing false from true spoken statements.
• To compare the accuracy of MRT with practitioners' intuition in detecting lies.
• To validate an established but insufficiently validated application of MRT.

Main Methods:

• Two prospective diagnostic test accuracy studies were conducted.
• Practitioners used MRT to assess spoken statements, with true positives indicating subjective muscle weakening after a lie.
• Practitioners also made intuitive guesses, and both MRT and intuition accuracy were compared to the actual verity of statements.

Main Results:

• MRT accuracy was 0.659, significantly outperforming intuition accuracy (0.474) and chance (0.500) (p < 0.01).
• Experiment 2 replicated the findings of Experiment 1.
• No significant correlations were found for factors influencing MRT accuracy.

Conclusions:

• MRT demonstrated significant accuracy in distinguishing lies from truths compared to intuition and chance.
• The study's findings suggest MRT is a valid tool for this specific application.
• Limitations include a lack of generalizability to other MRT or MMT applications.