Abstract:
:The spatial vision of two adult galagos (Galago crassicaudatus) was assessed using a two choice discrimination task to determine their contrast sensitivity. Both contrast sensitivity functions exhibited low and high spatial frequency attenuation with the peak sensitivity at 1%. For one animal, the peak occurred at 0.5 c/deg and the extrapolated cutoff frequency was 2.6 c/deg; for the other, the peak was 1 c/deg and the cutoff was 4.3 c/deg. For this animal, grating acuity was also tested and, depending upon definition of threshold, yielded threshold estimates from 4.8 to 6.0 c/deg. The data supports the conclusion that the spatial vision of the galago and the cat is quite similar, a congruence that presumably reflects their adaptation to a nocturnal niche, rather than their divergent phylogenetic origins.
journal_name
Vision Resjournal_title
Vision researchauthors
Langston A,Casagrande VA,Fox Rdoi
10.1016/0042-6989(86)90094-5subject
Has Abstractpub_date
1986-01-01 00:00:00pages
791-6issue
5eissn
0042-6989issn
1878-5646pii
0042-6989(86)90094-5journal_volume
26pub_type
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