Human scotopic spatiotemporal sensitivity: A comparison of psychophysical and electrophysiological data

György Benedek, Krisztina Benedek, Szabolcs Kéri, Tamás Letoha, Márta Janáky

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The aim of the study was to investigate spatiotemporal visual functions under scotofic and photopic conditions in order to acquire human psychophysical and electrophysiological data that are comparable with contrast sensitivities based on single-unit recordings in animal experiments. Static and dynamic contrast sensitivities (CSs) and steady-state visual evoked potential (VEPs) were measured under photopic and scotopic conditions in healthy volunteers. The results from the CS experiment indicated that the inclusion of temporal modulation and the application of scotopic luminance levels uniformly resulted in a relatively increased sensitivity for low spatial frequencies. Similarly, analysis of the second harmonic component of the VEPs demonstrated a shift from band-pass to low-pass functions. These results suggest that, under scotopic conditions, human visuospatial processing is characteristically predominated by the functional activity of the magnocellular pathways.

Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalDocumenta Ophthalmologica
Volume106
Issue number2
DOIs
Publication statusPublished - Mar 1 2003

Keywords

  • Contrast sensitivity
  • Magnocellular pathway
  • Scotopic vision
  • Visual evoked potentials

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Physiology (medical)

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