Correlations and brain states: from electrophysiology to functional imaging

Adam Kohn, Amin Zandvakili, Matthew A. Smith

Research output: Contribution to journalReview articlepeer-review

69 Scopus citations


Neural activity in cortex is correlated, an observation that has traditionally been attributed to neurons receiving input from a shared and limited presynaptic pool. Recent studies have shown that correlations are also strongly influenced by network fluctuations that operate over a range of spatial and temporal scales, extending in some cases across cortical areas. These fluctuations are sensitive to internal states and external drive, so that correlations themselves depend strongly on cognitive state and stimulus properties. Given the potential impact on population coding, this modulation of correlations may play an important role in sensory processing.

Original languageEnglish (US)
Pages (from-to)434-438
Number of pages5
JournalCurrent Opinion in Neurobiology
Issue number4
StatePublished - Aug 2009

ASJC Scopus subject areas

  • General Neuroscience


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