Abnormal LEPs, indicating impairment in A-delta fibres, were found in 72.2% of ALS patients.
Abnormal SSEPs, indicating impairment in A-beta fibres, were found in 55.6% of ALS patients.
N1 amplitude of UE-LEPs, and N2 and P2 latencies of LE-LEPs, correlated with the severity of ALS.