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Updated: Oct 9, 2025

Assessment and Communication for People with Disorders of Consciousness
Published on: August 1, 2017
The Perceptual Awareness Scale-recent controversies and debates
Morten Overgaard1, Kristian Sandberg2
1Aarhus Institute of Advanced Studies, Aarhus University, Nørrebrogade 1A, Aarhus 8000, Denmark.
Abstract:
Accurate insight into subjective experience is crucial for the science of consciousness. The Perceptual Awareness Scale (PAS) was created in 2004 as a method for obtaining precise introspective reports for participants in research projects, and since then, the scale has become increasingly popular. This does not mean, of course, that no critiques have been voiced. Here, we briefly recapitulate our main thoughts on the intended PAS usage and the findings of the first decade, and we update this with the latest empirical and theoretical developments. We focus specifically on findings with relevance to whether consciousness is gradual or all-or-none phenomenon, to what should be considered conscious/unconscious, and to whether PAS is preferable to alternative measures of awareness. We respond in detail to some recent, selected articles.
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