Decreased electroencephalogram alpha band [8-13 Hz] power in amyotrophic lateral sclerosis patients: a study of alpha activity in an awake relaxed state.
Level 4 - case-series / case-control
Case-control observational study comparing ALS patients to normal controls.
PubMed 15805665 · doi:10.4103/0028-3886.15071
What was done
Quantitative electroencephalogram (EEG) analysis was used to assess alpha activity (8–13 Hz) in ALS patients during an awake relaxed state, compared against healthy controls.
What was found
ALS patients showed significantly lower amplitude with corresponding alpha band power reduction in both hemispheres, with the reduction noted as more prominent in the left hemisphere. No specific numerical values, sample sizes, or p-values were reported in the abstract.
Why it matters
This study provides an early electrophysiological observation of resting-state alpha oscillatory alterations in ALS, suggesting broader cortical changes beyond motor pathway degeneration.
Limits
The abstract does not disclose the sample size, baseline patient characteristics, disease duration, medication use, or quantitative statistics (effect sizes, confidence intervals, p-values).