What procedure confirmed that the first MEP method was inaccurate?

The procedure that confirmed the first Motor Evoked Potential (MEP) method was inaccurate is dorsal rhizotomy. Dorsal rhizotomy involves cutting specific nerve roots in the spinal cord that carry sensory information. This technique helps in understanding the functional contributions of these nerve pathways.

In the context of evaluating MEPs, dorsal rhizotomy is significant because it can show discrepancies between expected and observed outcomes of MEP readings. By selectively altering sensory input, researchers can examine how these changes affect the MEP results, thereby revealing inaccuracies in the initial method's effectiveness in measuring motor functions.

The use of this surgical procedure provided critical insights into the relationship between sensory and motor pathways in the nervous system, yielding results that led to a reevaluation of the original MEP methodology. This highlights the importance of experimental interventions in understanding the complexities of neuromuscular function and the importance of refining techniques for accurate assessments.