Eye movements and bisection behavior in spatial neglect syndrome: representational biases induced by the segment length and spatial dislocation of the stimulus

Michela Balconi, Matteo Sozzi, Chiara Ferrari, Luigi Pisani, Claudio Mariani

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6 Citazioni (Scopus)

Abstract

The present study explored behavioral and eye-movement measures in unilateral neglect patients in response to online bisection task (unfilled gap line). Two different tasks supported the bisection performance, a pointing and a grasping strategy. It was explored whether these different strategies may influence subjects’ behavioral and eye-movement measures in response to different segment features: segment length (from shorter to longer) and segment spatial dislocation (from right to left spatial location). Consistent spatial biases were found for both bisection responses, fixation count, and duration, as well as for the first fixation count in case of pointing task. An ‘‘extreme-left’’ gradient effect was suggested and discussed, with patients’ behavioral and eye measures more impaired. On the contrary, the patients’ performance overlaps with the controls’ one in case a grasping task. The direct link of visual pointing and grasping strategy, respectively, with the two cortical ventral and dorsal pathways was adduced to explain our results.
Lingua originaleEnglish
pagine (da-a)89-92
Numero di pagine4
RivistaCognitive Processing
Volume13
DOI
Stato di pubblicazionePubblicato - 2012

Keywords

  • Bisection task
  • Eye-movement measures
  • Grasping
  • Pointing
  • Spatial gradient
  • Spatial neglect

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