Neglect for low luminance contrast stimuli but not for high colour contrast stimuli: A behavioural and electrophysiological case study

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Abstract

We describe a patient with a right-hemisphere lesion involving the frontal lobe, the post-central gyrus and the superior parietal lobule. Behavioural testing demonstrated severe left unilateral neglect to low luminance contrast stimuli, but not to high colour contrast stimuli. Evoked potentials to low contrast luminance gratings presented in the left hemifield were not reliable. However, equiluminant coloured gratings presented in the same hemifield evoked reliable electrophysiological responses, although longer in latency than those evoked in the right hemifield. These findings suggest that the patient has severe damage of the high contrast sensitivity magnocellular pathway in the right hemisphere, with minor involvement of the parvocellular pathway.

Original languageEnglish
Pages (from-to)1360-1364
Number of pages5
JournalNeuroReport
Volume7
Issue number8
Publication statusPublished - 1996

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Color
Parietal Lobe
Contrast Sensitivity
Somatosensory Cortex
Frontal Lobe
Evoked Potentials

Keywords

  • Colour
  • Contrast
  • Luminance
  • Magnocellular
  • Neglect

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

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abstract = "We describe a patient with a right-hemisphere lesion involving the frontal lobe, the post-central gyrus and the superior parietal lobule. Behavioural testing demonstrated severe left unilateral neglect to low luminance contrast stimuli, but not to high colour contrast stimuli. Evoked potentials to low contrast luminance gratings presented in the left hemifield were not reliable. However, equiluminant coloured gratings presented in the same hemifield evoked reliable electrophysiological responses, although longer in latency than those evoked in the right hemifield. These findings suggest that the patient has severe damage of the high contrast sensitivity magnocellular pathway in the right hemisphere, with minor involvement of the parvocellular pathway.",
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T1 - Neglect for low luminance contrast stimuli but not for high colour contrast stimuli

T2 - A behavioural and electrophysiological case study

AU - Doricchi, Fabrizio

AU - Angelelli, Paola

AU - De Luca, Maria

AU - Spinelli, Donatella

PY - 1996

Y1 - 1996

N2 - We describe a patient with a right-hemisphere lesion involving the frontal lobe, the post-central gyrus and the superior parietal lobule. Behavioural testing demonstrated severe left unilateral neglect to low luminance contrast stimuli, but not to high colour contrast stimuli. Evoked potentials to low contrast luminance gratings presented in the left hemifield were not reliable. However, equiluminant coloured gratings presented in the same hemifield evoked reliable electrophysiological responses, although longer in latency than those evoked in the right hemifield. These findings suggest that the patient has severe damage of the high contrast sensitivity magnocellular pathway in the right hemisphere, with minor involvement of the parvocellular pathway.

AB - We describe a patient with a right-hemisphere lesion involving the frontal lobe, the post-central gyrus and the superior parietal lobule. Behavioural testing demonstrated severe left unilateral neglect to low luminance contrast stimuli, but not to high colour contrast stimuli. Evoked potentials to low contrast luminance gratings presented in the left hemifield were not reliable. However, equiluminant coloured gratings presented in the same hemifield evoked reliable electrophysiological responses, although longer in latency than those evoked in the right hemifield. These findings suggest that the patient has severe damage of the high contrast sensitivity magnocellular pathway in the right hemisphere, with minor involvement of the parvocellular pathway.

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