VEP in neglect patients have longer latencies for luminance but not for chromatic patterns

Donatella Spinelli, Paola Angelelli, Maria De Luca, David C. Burr

Research output: Contribution to journalArticle

Abstract

In patients with unilateral neglect, visual evoked potentials (VEP) to stimuli displayed in the left visual field are delayed compared with responses to right visual field stimuli. In the present study, 10 patients with right brain damage and neglect were tested with contrast-reversed sinusoidal gratings, modulated either in luminance or in chromaticity. For gratings of luminance contrast modulated over relatively high temporal frequencies (4-10.5 Hz), latencies of VEP were about 30 ms longer for stimuli presented to the contralesional (left) visual field than to the held ipsilateral to the lesion. For equiluminant stimuli modulated at relatively low temporal frequencies (1-4 Hz), however, VEP latency was the same for both hemifields. As this condition activates predominately the parvocellular pathway the results are consistent with our previous suggestion that the delay observed with luminance stimuli in neglect patients results from selective disruption of the faster response of the magnocellular pathway.

Original languageEnglish
Pages (from-to)815-819
Number of pages5
JournalNeuroReport
Volume7
Issue number3
Publication statusPublished - 1996

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Keywords

  • Equiluminance
  • Magnocellular pathway
  • Neglect
  • Parvocellular pathway
  • Visual evoked potentials

ASJC Scopus subject areas

  • Neuroscience(all)

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