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Related Experiment Videos

Inhibitory processing following damage to the parietal lobe.

Ana B Vivas1, Glyn W Humphreys, Luis J Fuentes

  • 1Department of Psychology, City Liberal Studies, Affiliated Institution of the University of Sheffield, 13 Tsimiski Street, Thessaloniki 546 24, Greece. vivas@city.academic.gr

Neuropsychologia
|July 10, 2003
PubMed
Summary

Patients with posterior parietal lobe lesions exhibit altered spatial attention, specifically impacting inhibition of return (IOR) for contralesional targets. This suggests the parietal lobe modulates IOR and inhibitory tagging of stimuli.

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology

Background:

  • Spatial attention involves inhibitory mechanisms, including inhibition of return (IOR).
  • The posterior parietal lobe is crucial for spatial processing and attention.
  • Inhibitory tagging is a proposed mechanism for managing attentional resources.

Purpose of the Study:

  • To investigate the role of the posterior parietal lobe in the inhibitory properties of spatial attention.
  • To examine how parietal lesions affect inhibition of return (IOR).
  • To explore the neural basis of inhibitory tagging using a combined IOR and Stroop task.

Main Methods:

  • A double cue inhibition of return (IOR) procedure was used.
  • A Stroop task was combined with the IOR procedure.
  • Participants included four patients with posterior parietal lobe lesions and control participants.

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Main Results:

  • Parietal patients demonstrated an IOR effect exclusively for contralesional targets.
  • Control participants replicated previous findings showing reduced Stroop interference at cued locations.
  • Parietal patients exhibited reduced Stroop interference for contralesional targets at cued locations.

Conclusions:

  • The parietal lobe significantly modulates inhibition of return (IOR).
  • Parietal cortex influences the application of inhibitory tagging to stimuli.
  • Lesions in the posterior parietal lobe disrupt the typical pattern of IOR and inhibitory tagging, particularly for contralesional stimuli.