A global workspace model for phenomenal and access consciousness.

A unifying global workspace model proposes that phenomenal and access consciousness arise from distinct yet interacting brain loops involving recurrent neural interactions. Feedback signaling onto sensory cortical maps is critical for phenomenal consciousness, while two forms of top-down attention—attention for perception and attention for access—play differential roles for phenomenal and access consciousness. The model was implemented as a neural network that simulated single and multiple visual object processing and the attentional blink.

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Abstract

Both the global workspace theory and Block's distinction between phenomenal and access consciousness, are central in the current debates about consciousness and the neural correlates of consciousness. In this article, a unifying global workspace model for phenomenal and access consciousness is proposed. In the model, recurrent neural interactions take place in distinct yet interacting access and phenomenal brain loops. The effectiveness of feedback signaling onto sensory cortical maps is emphasized for the neural correlates of phenomenal consciousness. Two forms of top-down attention, attention for perception and attention for access, play differential roles for phenomenal and access consciousness. The model is implemented in a neural network form, with the simulation of single and multiple visual object processing, and of the attentional blink.