Divisive normalization and neuronal oscillations in a single hierarchical framework of selective visual attention

Jorrit Steven Montijn, P. Christiaan Klink, Richard J.A. van Wezel

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    11 Citations (Scopus)
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    Abstract

    Divisive normalization models of covert attention commonly use spike rate modulations as indicators of the effect of top-down attention. In addition, an increasing number of studies have shown that top-down attention increases the synchronization of neuronal oscillations as well, particularly in gamma-band frequencies (25–100 Hz). Although modulations of spike rate and synchronous oscillations are not mutually exclusive as mechanisms of attention, there has thus far been little effort to integrate these concepts into a single framework of attention. Here, we aim to provide such a unified framework by expanding the normalization model of attention with a multi-level hierarchical structure and a time dimension; allowing the simulation of a recently reported backward progression of attentional effects along the visual cortical hierarchy. A simple cascade of normalization models simulating different cortical areas is shown to cause signal degradation and a loss of stimulus discriminability over time. To negate this degradation and ensure stable neuronal stimulus representations, we incorporate a kind of oscillatory phase entrainment into our model that has previously been proposed as the “communication-through-coherence‿ (CTC) hypothesis. Our analysis shows that divisive normalization and oscillation models can complement each other in a unified account of the neural mechanisms of selective visual attention. The resulting hierarchical normalization and oscillation (HNO) model reproduces several additional spatial and temporal aspects of attentional modulation and predicts a latency effect on neuronal responses as a result of cued attention.
    Original languageEnglish
    Pages (from-to)1-17
    Number of pages17
    JournalFrontiers in neural circuits
    Volume6
    Issue number22
    DOIs
    Publication statusPublished - 4 May 2012

    Keywords

    • BSS-Neurotechnology and cellular engineering
    • Communication-through-coherence
    • Computational model
    • Phase-locking
    • Divisive normalization
    • Attention
    • Visual cortex
    • Neuronal oscillations
    • Hierarchical normalization and oscillation

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