Gamma Oscillations Underlie the Maintenance of Feature-Specific Information and the Contents of Visual Working Memory

Roosa Sirola, Santeri Rouhinen, Sheng Wang, Matias Palva, Satu Palva

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Abstrakti

Visual working memory (VWM) sustains information online as integrated object representations. Neuronal mechanisms supporting the maintenance of feature-specific information have remained unidentified. Synchronized oscillations in the gamma band (30–120 Hz) characterizeVWMretention and predict task performance, but whether these oscillations are specific to memorized features andVWMcontents or underlie general executiveVWMfunctions is not known. In the present study, we investigated whether gamma oscillations reflect the maintenance of feature-specific information in VWM. Concurrent magneto- and electroencephalography was recorded while subjects memorized different object features or feature conjunctions in identical VWM experiments. Using a data-driven source analysis approach, we show that the strength, loaddependence, and source topographies of gamma oscillations in the visual cortex differentiate these memorized features. Loaddependence of gamma oscillations in feature-specific visual and prefrontal areas also predicts VWM accuracy. Furthermore,corroborating the hypothesis that gamma oscillations support the perceptual binding of feature-specific neuronal assemblies, we also show that VWM for color–location conjunctions is associated with stronger gamma oscillations than that for these features separately. Gamma oscillations hence support the maintenance of feature-specific information and reflect VWM
contents. The results also suggest that gamma oscillations contribute to feature binding in the formation of memory representations.
Alkuperäiskielienglanti
LehtiCerebral Cortex
Vuosikerta25
Numero10
Sivut3788-3801
Sivumäärä4
ISSN1047-3211
DOI - pysyväislinkit
TilaJulkaistu - 2015
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 3112 Neurotieteet
  • 3124 Neurologia ja psykiatria

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