The electroretinogram of the little owl (Athene noctua)

Vittorio Porciatti; Gigliola Fontanesi; Paola Bagnoli

doi:10.1016/0042-6989(89)90151-X

The electroretinogram of the little owl (Athene noctua)

Vittorio Porciatti, Gigliola Fontanesi, Paola Bagnoli

Research output: Contribution to journal › Article

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 language	English (US)
Pages (from-to)	1693-1698
Number of pages	6
Journal	Vision Research
Volume	29
Issue number	12
DOIs	https://doi.org/10.1016/0042-6989(89)90151-X
State	Published - 1989
Externally published	Yes

Keywords

Flash ERG
Little owl
Luminance levels
Pattern ERG

ASJC Scopus subject areas

Ophthalmology
Sensory Systems

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10.1016/0042-6989(89)90151-X

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title = "The electroretinogram of the little owl (Athene noctua)",

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.",

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