Near and far space neglect: Task sensitivity and anatomical substrates

Lina Aimola, Igor Schindler, Anna Maria Simone, Annalena Venneri

Research output: Contribution to journalArticle

Abstract

Most group studies which have investigated neglect for near and far space have found an increased severity of symptoms in far space compared to near space. However, the majority of these studies used relatively small samples and based their findings almost exclusively on line bisection performance.The aim of the present study was, therefore, to explore the occurrence of neglect for near and far space in a larger group of unselected right brain damaged patients and to evaluate whether neglect specific to near and far space is a task-related deficit or generalises across distance irrespective of task. In addition, a lesion overlap analysis was carried out to identify critical lesion sites associated with distance specific neglect deficits.Thirty-eight right hemisphere damaged patients carried out a line bisection and a cancellation task by using a pen in near space (40. cm) and a laser pointer in far space (320. cm).The results showed that both the number of left-sided omissions and rightward bisection errors were significantly increased in near compared to far space. Distance specific dissociations, albeit less common, were more frequently observed for cancellation than line bisection.These results suggest that space representation in neglect is more severely impaired in near than in far space. In addition, distance related dissociations in neglect may depend on task demands. Although the anatomical findings were broadly consistent with a dorsal and ventral stream dichotomy for near and far space processing, they also suggest the involvement of intermediate structures in distance related neglect phenomena.

Original languageEnglish
Pages (from-to)1115-1123
Number of pages9
JournalNeuropsychologia
Volume50
Issue number6
DOIs
Publication statusPublished - May 2012

Keywords

  • Anatomy
  • Far space
  • Line bisection
  • Near space
  • Spatial neglect
  • Visual search

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)

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