Cortical control of inhibition of return: evidence from patients with inferior parietal damage and visual neglect

Alexia Bourgeois, Raffaella Migliaccio, Michel Thiebaut De Schotten, Paolo Bartolomeo, Ana B. Chica, Michel Thiebaut De Schotten

Risultato della ricerca: Contributo in rivistaArticolo in rivista

44 Citazioni (Scopus)

Abstract

Inhibition of return (IOR) refers to slower reaction times to targets presented at previously stimulated or inspected locations. This phenomenon biases orienting towards novel locations and is functional to an effective exploration of the environment. Patients with right brain damage and left visual neglect explore their environment asymmetrically, with strong difficulties to orient attention to left-sided objects. We show for the first time a dissociation between manual and saccadic IOR in neglect. Our patients demonstrated facilitation, instead of inhibition, for repeated right-sided targets with manual responses, but normal IOR to right-sided targets with saccadic responses. All neglect patients had damage to the supramarginal gyrus in the right parietal lobe, or to its connections with the ipsilateral prefrontal cortex. We concluded that IOR with manual responses relies on fronto-parietal attentional networks in the right hemisphere, whose functioning is typically impaired in neglect patients. Saccadic IOR may instead depend on circuits less likely to be damaged in neglect, such as the retinotectal visual pathway.
Lingua originaleEnglish
pagine (da-a)800-809
Numero di pagine10
RivistaNeuropsychologia
Volume50
DOI
Stato di pubblicazionePubblicato - 2012

Keywords

  • Attention

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