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Related Experiment Videos

Direction-selective motion blindness after unilateral posterior brain damage.

Olaf Blanke1, Theodor Landis, Christophe Mermoud

  • 1Department of Neurology, University Hospital of Geneva, 24 rue Micheli-du-Crest, 1211 Geneva, Switzerland. olaf.blanke@hcuge.ch

The European Journal of Neuroscience
|August 13, 2003
PubMed
Summary

Motion blindness (MB) selectively impairs visual motion perception. This study reveals MB can be direction-selective, not pandirectional, following posterior brain damage, challenging previous assumptions.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Motion blindness (MB) is a selective deficit in perceiving visual motion.
  • Typically, MB is considered pandirectional, affecting all motion directions.
  • Existing theories link MB to damage in the visual motion pathway, particularly area MT/V5.

Purpose of the Study:

  • To investigate if posterior brain damage causes direction-selective MB.
  • To determine if MB is characterized by specific directional impairments rather than a general deficit.
  • To explore the relationship between lesion location and the pattern of MB.

Main Methods:

  • Assessed motion direction discrimination in patients with unilateral posterior brain damage.
  • Measured psychophysical thresholds for four cardinal directions separately.

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  • Analyzed erroneous motion perception for directional bias and correlated findings with lesion analysis.

    • Main Results:

    • Identified direction-selective MB, with severe impairment in one or two directions while others remained normal.
    • Observed both quantitative (increased thresholds) and qualitative (systematic errors) impairments in MB.
    • Found that unilateral damage to the human homologue of MT/V5 and parieto-occipital cortex can cause MB.

    Conclusions:

    • MB can be direction-selective, indicating specialized cortical modules for single motion directions.
    • The findings suggest these direction-selective modules may be larger than previously assumed.
    • Posterior unilateral brain damage, including to MT/V5 homologues and parieto-occipital cortex, can lead to direction-selective motion blindness.