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 Resjournal_title
Vision researchauthors
Porciatti V,Fontanesi G,Bagnoli Pdoi
10.1016/0042-6989(89)90151-xsubject
Has Abstractpub_date
1989-01-01 00:00:00pages
1693-8issue
12eissn
0042-6989issn
1878-5646pii
0042-6989(89)90151-Xjournal_volume
29pub_type
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