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 6 c/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.

journal_name

Vision Res

journal_title

Vision research

authors

Porciatti V,Fontanesi G,Bagnoli P

doi

10.1016/0042-6989(89)90151-x

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

1693-8

issue

12

eissn

0042-6989

issn

1878-5646

pii

0042-6989(89)90151-X

journal_volume

29

pub_type

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