When brain rhythms aren't 'rhythmic': implication for their mechanisms and meaning.

Abstract:

:Rhythms are a prominent signature of brain activity. Their expression is correlated with numerous examples of healthy information processing and their fluctuations are a marker of disease states. Yet, their causal or epiphenomenal role in brain function is still highly debated. We review recent studies showing brain rhythms are not always 'rhythmic', by which we mean representative of repeated cycles of activity. Rather, high power and continuous rhythms in averaged signals can represent brief transient events on single trials whose density accumulates in the average. We also review evidence showing time-domain signals with vastly different waveforms can exhibit identical spectral-domain frequency and power. Further, non-oscillatory waveform feature can create spurious high spectral power. Knowledge of these possibilities is essential when interpreting rhythms and is easily missed without considering pre-processed data. Lastly, we discuss how these findings suggest new directions to pursue in our quest to discover the mechanism and meaning of brain rhythms.

journal_name

Curr Opin Neurobiol

authors

Jones SR

doi

10.1016/j.conb.2016.06.010

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

72-80

eissn

0959-4388

issn

1873-6882

pii

S0959-4388(16)30076-9

journal_volume

40

pub_type

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