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Trans-saccadic memory after right parietal brain damage.

Antonia F Ten Brink1, Jasper H Fabius2, Nick A Weaver3

  • 1Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, the Netherlands; Department of Psychology, University of Bath, Bath, UK.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|August 4, 2019
PubMed
Summary

Damage to the right posterior parietal cortex (PPC) impairs spatial memory across eye movements. This study found general spatial memory deficits, not specific to gaze direction, in patients with right PPC lesions.

Keywords:
Constructional apraxiaHemispatial neglectParietal cortexSpatial remappingSpatial working memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Spatial remapping is crucial for trans-saccadic perception, enabling updating of visual information across eye movements.
  • The right posterior parietal cortex (PPC) is strongly implicated in spatial remapping processes.
  • Understanding the precise role of the right PPC in spatial memory is essential for comprehending visual perception mechanisms.

Purpose of the Study:

  • To investigate the impact of right PPC damage on direction-specific trans-saccadic memory.
  • To compare trans-saccadic memory performance for leftward versus rightward eye movements.
  • To assess memory for items remapped within the left versus right visual field.

Main Methods:

  • Included 9 stroke patients with unilateral right PPC lesions and 31 healthy controls.
  • Participants memorized item locations, executed saccades (left/right/up/down), and identified probe shifts.
  • Bayesian repeated measures ANOVAs analyzed performance differences for gaze direction and visual field location.

Main Results:

  • Patients with right PPC damage exhibited impaired trans-saccadic memory compared to controls, irrespective of gaze direction or item location.
  • No direction-specific deficits (left vs. right saccades) were observed at the individual patient level.
  • Two patients showed worse performance for items in the left versus right visual field.

Conclusions:

  • Right PPC damage results in general spatial memory impairments, not specific to gaze direction.
  • The findings suggest a broader role for the right PPC in spatial memory beyond direction-specific remapping.
  • These results contribute to understanding the neural basis of spatial updating and visual perception.