Table 2. Intra-individual variation in motor evoked potential amplitudes in people with AHC.

	Time 1		Time 2
Subject	Mean Amplitude (mV)	SD	Mean Amplitude (mV)	SD	P value (2-tailed unpaired t-test)
A2	0.238	0.086	0.405	0.139	0.002
A3	0.137	0.065	0.053	0.024	0.008
A4	0.401	0.084	0.709	0.424	0.024

Mean amplitudes and standard deviation (SD) of MEPs at Time 1 and Time 2. Responses are to stimulation at 110% rMT. P values are for a two-tailed unpaired t-test comparing MEP sizes at Time 1 and Time 2. Note that in this small sample there is no consistent pattern such that rMT is always bigger at either Time 1 or Time 2.