Attention induces synchronization-based response gain in steady-state visual evoked potentials

Yee Joon Kim, Marcia Grabowecky, Ken A. Paller, Krishnakumar Muthu, Satoru Suzuki*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

192 Scopus citations


When attention is voluntarily directed to a spatial location, visual sensitivity increases at that location. What causes this improved sensitivity? Studies of single neuron spike rates in monkeys have provided mixed results in regard to whether attending to a stimulus increases its effective contrast (contrast gain) or multiplicatively boosts stimulus-driven neural responses (response or activity gain). We monitored frequency-tagged steady-state visual evoked potentials (SSVEPs) in humans and found that voluntary sustained attention multiplicatively increased stimulus-driven population electrophysiological activity. Analyses of intertrial phase coherence showed that this attentional response gain was at least partially due to the increased synchronization of SSVEPs to stimulus flicker. These results suggest that attention operates in a complementary manner at different levels; attention seems to increase single-neuron spike rates in a variety of ways, including contrast, response and activity gains, while also inducing a multiplicative boost on neural population activity via enhanced response synchronization.

Original languageEnglish (US)
Pages (from-to)117-125
Number of pages9
JournalNature neuroscience
Issue number1
StatePublished - Jan 2007

ASJC Scopus subject areas

  • General Neuroscience


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