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Related Experiment Videos

"Bottom-up" and "top-down" effects on reading saccades: a case study.

N J Upton1, T L Hodgson, G T Plant

  • 1Department of Human Sciences, Brunel University, Uxbridge, Middlesex UB8 2HG, UK. nat.upton@brunel.ac.uk

Journal of Neurology, Neurosurgery, and Psychiatry
|October 23, 2003
PubMed
Summary

Incongruous hemianopia impacts reading. Right parafoveal sparing is crucial for planning reading saccades, not single word identification, as shown by PET scans.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • Investigating visual field defects and their impact on reading is crucial for understanding visual processing.
  • Hemianopia, a specific visual field loss, presents unique challenges for reading and visual-behavioral tasks.

Observation:

  • A single case study examined reading in a patient with incongruous hemianopia (macular sparing in one eye, macular splitting in the other).
  • Reading speed and eye movement patterns were analyzed using a voice-trigger system and PET scans during various reading tasks.

Findings:

  • The patient read faster with the left eye, showing a word length effect in the right eye but not the left.
  • Eye movements were more organized with the left eye, with fewer saccades.
  • PET data revealed bilateral foveal V1 activity during binocular reading and left parafoveal V1 activation during left-eye-only text reading.

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Implications:

  • Macular splitting hemianopia can induce a word length effect, mimicking aspects of pure alexia.
  • Right parafoveal vision is essential for planning reading saccades, though not for single word identification.
  • PET imaging can visualize top-down attentional processes in parafoveal V1 during text reading.