PMID: 12470622Dec 10, 2002Paper

Pre-requisites for conscious awareness: clues from electrophysiological and behavioral studies of unilateral neglect patients

Consciousness and Cognition
Leon Y Deouell

Abstract

Encoding sensory events entails processing of several physical attributes. Is the processing of any of these attributes a pre-requisite of conscious awareness? This selective review examines a recent set of behavioral and event-related potentials, studies conducted in patients with visual and auditory unilateral neglect or extinction, with the aim of establishing what aspects of initial processing are impaired in these patients. These studies suggest that extinguished visual stimuli excite the sensory cortices, but perhaps to a lesser degree than acknowledged stimuli do. However, encoding spatial attributes of auditory and visual stimuli appear to be preferentially impaired. In light of results from patients with other neuro-behavioral deficits, it is argued that egocentric spatial information is an essential pre-requisite for knowing that an external event occurred. In contrast, information handled by mostly domain-specific circuits, such as in the ventral temporal lobe, supports awareness of the identity of a stimulus, but not of its mere presence. Without spatial information, the stimulus identity will remain implicit.

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Citations

Jul 7, 2010·Experimental Brain Research·Lee Sela, Noam Sobel
May 12, 2004·Consciousness and Cognition·Jing Zhu
Aug 28, 2003·Consciousness and Cognition·Benjamin Libet
Jan 10, 2012·Journal of Cognitive Neuroscience·Barbara TreccaniSergio Della Sala
Mar 13, 2012·Neuropsychologia·Judith Domínguez-BorràsPatrik Vuilleumier
Jun 14, 2005·Consciousness and Cognition·Hamid Reza Naghavi, Lars Nyberg
Oct 20, 2007·Neuropsychologia·Didier GrandjeanPatrik Vuilleumier
Mar 13, 2009·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·E V OrekhovaM Elam
Jun 24, 2009·Neuropsychologia·Mika KoivistoAntti Revonsuo
Nov 21, 2007·Brain : a Journal of Neurology·Francesco Di RussoDonatella Spinelli
Dec 17, 2009·Neuroscience and Biobehavioral Reviews·Mika Koivisto, Antti Revonsuo
Sep 29, 2020·Journal of Cognitive Neuroscience·Haggar Cohen-DallalYoni Pertzov
Jan 9, 2019·Frontiers in Psychology·Barbara Treccani
Oct 2, 2021·Journal of Clinical and Experimental Neuropsychology·Mario de la Piedra WalterHelmut Hildebrandt

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