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Title

Gambling against neglect: Unconscious spatial biases induced by reward reinforcement in healthy people and brain-damaged patients

Authors
Leroy, Rosario
Pavin, Sandra
Diserens, Karin
Published in Cortex. 2013, vol. 49, no. 10, p. 2616-2627
Abstract Orienting attention in space recruits fronto-parietal networks whose damage results in unilateral spatial neglect. However, attention orienting may also be governed by emotional and motivational factors; but it remains unknown whether these factors act through a modulation of the fronto-parietal attentional systems or distinct neural pathways. Here we asked whether attentional orienting is affected by learning about the reward value of targets in a visual search task, in a spatially specific manner, and whether these effects are preserved in right-brain damaged patients with left spatial neglect. We found that associating rewards with left-sided (but not right-sided) targets during search led to progressive exploration biases towards left space, in both healthy people and neglect patients. Such spatially specific biases occurred even without any conscious awareness of the asymmetric reward contingencies. These results show that reward-induced modulations of space representation are preserved despite a dysfunction of fronto-parietal networks associated with neglect, and therefore suggest that they may arise through spared subcortical networks directly acting on sensory processing and/or oculomotor circuits. These effects could be usefully exploited for potentiating rehabilitation strategies in neglect patients.
Identifiers
PMID: 23969194
Full text
Article (Published version) (1.2 MB) - document accessible for UNIGE members only Limited access to UNIGE
Structures
Research groups Mécanismes cérébraux du comportement et des fonctions cognitives (701)
Neuroimagerie du Sommeil et de la Cognition (832)
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(ISO format)
LUCAS BALOGH, Nadia et al. Gambling against neglect: Unconscious spatial biases induced by reward reinforcement in healthy people and brain-damaged patients. In: Cortex, 2013, vol. 49, n° 10, p. 2616-2627. https://archive-ouverte.unige.ch/unige:34052

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Deposited on : 2014-02-04

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