On variability in local field potentials.

Variability in local field potentials and EEG shows distinct patterns post-stimulus, with LFP gamma-band variability remaining high despite stimulus presentation.

• Why it matters: Understanding neuronal variability is crucial for decoding neural signals and cognitive processes, yet differences between measures like ATV and ITV across brain signals are not well characterized.
• What they did: The study analyzed ATV and ITV in EEG and LFP signals, revealing that outside ERPs, ATV closely matches ITV, which equals signal power, and introduced CV(power) as an independent variability metric.
• The result: Findings show that ATV decreases in EEG after stimulus, but not in LFP gamma-band, and CV(power) provides a normalized measure linked to decodability, advancing variability analysis in neurophysiology.