The electroretinogram of the little owl (Athene noctua)

Vittorio Porciatti, Gigliola Fontanesi, Paola Bagnoli

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Electroretinographic responses (ERGs) have been recorded from the cornea of the little owl (Athene noctua) in response to single light flashes and to alternating sinusoidal gratings (pattern) at different levels of light adaptation. Both flash- and pattern-evoked ERGs show scotopic as well as photopic components. The pattern evoked ERG is spatially tuned with tuning functions which shift towards lower frequencies by reducing the mean luminance. The retinal acuity is about 6c/deg at 2.3 log cd/m2 and decreases progressively by reducing the mean luminance. No pattern ERG can be recorded beyond -6. 7 log cd/m2 at any spatial frequency. The pattern ERG amplitude decreases progressively by reducing the contrast. The extrapolated contrast threshold is about 1%. Acuity and contrast sensitivity ERG values are in the range of those obtained by operant techniques in other species with duplex retinae such as owls and cats.

Original languageEnglish (US)
Pages (from-to)1693-1698
Number of pages6
JournalVision Research
Volume29
Issue number12
DOIs
StatePublished - 1989
Externally publishedYes

Keywords

  • Flash ERG
  • Little owl
  • Luminance levels
  • Pattern ERG

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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