Reliability of the 'observation of movement' method for determining motor threshold using transcranial magnetic stimulation

► The observation of movement (OM) method is used for obtaining motor threshold for the application of transcranial magnetic stimulation. ► We present evidence that verifies the high test/re-test reliability of this method. ► Our findings confirm the suitability of the OM method as a safe and accurate method of assessing cortical excitability.