Table 1

 Latency and amplitude of R1, R2, and R2′ components of BR in the PLS group (n  =  10) v ALS group (n  =  10) and controls (n  =  30). Values are mean (SD).

VariableControlsPatients
PLSALS
*p<0.001 v healthy control group and p>0.1 v other patient group.
AML, amyotrophic lateral sclerosis; PLS, primary lateral sclerosis.
Ipsilateral responses
R1 latency (msec)10.6 (1.1)10.2 (0.5)10.1 (0.5)
R1 amplitude (μV)250 (48.2)232.4 (41.8)231.5 (46.4)
R2 latency (msec)31.1 (2.2)30.8 (1.6)30.6 (1.5)
R2 amplitude (μV)345 (81.2)158.6 (50.3)*151.2 (48.8)*
Contralateral responses
R2′ latency (msec)31.3 (2.3)31.25 (1.6)30.9 (1.5)
R2′ amplitude (μV)296.2 (62.3)92.7 (22.2)*91 (21.6)*