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  • Title: Does cross-frequency phase coupling of oscillatory brain activity contribute to a better understanding of visual working memory?
    Author: Sauseng P, Peylo C, Biel AL, Friedrich EVC, Romberg-Taylor C.
    Journal: Br J Psychol; 2019 May; 110(2):245-255. PubMed ID: 30079531.
    Abstract:
    Nesting of fast rhythmical brain activity (gamma) into slower brain waves (theta) has frequently been suggested as a core mechanism of multi-item working memory (WM) retention. It provides a better understanding of WM capacity limitations, and, as we discuss in this review article, it can lead to applications for modulating memory capacity. However, could cross-frequency coupling of brain oscillations also constructively contribute to a better understanding of the neuronal signatures of working memory compatible with theoretical approaches that assume flexible capacity limits? Could a theta-gamma code also be considered as a neural mechanism of flexible sharing of cognitive resources between memory representations in multi-item WM? Here, we propose potential variants of theta-gamma coupling that could explain WM retention beyond a fixed memory capacity limit of a few visual items. Moreover, we suggest how to empirically test these predictions in the future.
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