Right brain damaged patients affected by contralesional object-centred neglect are able to process all objects around them but systematically omit the left part of these objects. We show that pure object-centred neglect can be simulated by a basis function neural network in which the activity of units allowing head-centred coding of space is based on the activity of gaze-dependent units with no lateral gradient of preferred eye positions along the horizontal space. This type of network simulates complete dissociation between object-centred and egocentric neglect, as observed in patients' copies of multi-item drawings. Based on these results and available neurophysiological, clinical and brain imaging data, it is proposed that disruption of a cerebral network including dorsal occipital and parietal areas and the supplementary eye fields could be the main cause of object-centred neglect. (c) 2007 Elsevier Ltd. All rights reserved.
Object-centred neglect: Simulation with head-centred coding based on Gaussian gaze-dependent units / Silvetti, Massimo; Eliano, Pessa; Doricchi, Fabrizio. - In: NEUROPSYCHOLOGIA. - ISSN 0028-3932. - STAMPA. - 45:11(2007), pp. 2553-2560. [10.1016/j.neuropsychologia.2007.03.012]
Object-centred neglect: Simulation with head-centred coding based on Gaussian gaze-dependent units
SILVETTI, Massimo;DORICCHI, FABRIZIO
2007
Abstract
Right brain damaged patients affected by contralesional object-centred neglect are able to process all objects around them but systematically omit the left part of these objects. We show that pure object-centred neglect can be simulated by a basis function neural network in which the activity of units allowing head-centred coding of space is based on the activity of gaze-dependent units with no lateral gradient of preferred eye positions along the horizontal space. This type of network simulates complete dissociation between object-centred and egocentric neglect, as observed in patients' copies of multi-item drawings. Based on these results and available neurophysiological, clinical and brain imaging data, it is proposed that disruption of a cerebral network including dorsal occipital and parietal areas and the supplementary eye fields could be the main cause of object-centred neglect. (c) 2007 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.