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• W2027183670 startingPage "343" @default.
• W2027183670 abstract "Abstract Studies of visual acuity in primates have shown that diurnal haplorhines have higher acuity (30–75 cycles per degree (c/deg)) than most other mammals. However, relatively little is known about visual acuity in non‐haplorhine primates, and published estimates are only available for four strepsirrhine genera ( Microcebus , Otolemur , Galago , and Lemur ). We present here the first measurements of visual acuity in a cathemeral strepsirrhine species, the blue‐eyed black lemur ( Eulemur macaco flavifrons ). Acuity in two subjects, a 3‐year‐old male and a 16‐year‐old female, was assessed behaviorally using a two‐alternative forced choice discrimination task. Visual stimuli consisted of high contrast square wave gratings of seven spatial frequencies. Acuity threshold was determined using a 70% correct response criterion. Results indicate a maximum visual acuity of 5.1 c/deg for the female (1718 trials) and 3.8 c/deg for the male (846 trials). These values for E. macaco are slightly lower than those reported for diurnal Lemur catta , and are generally comparable to those reported for nocturnal Microcebus murinus and Otolemur crassicaudatus . To examine ecological sources of variation in primate visual acuity, we also calculated maximum theoretical acuity for Cheirogaleus medius (2.8 c/deg) and Tarsius syrichta (8.9 c/deg) using published data on retinal ganglion cell density and eye morphology. These data suggest that visual acuity in primates may be influenced by activity pattern, diet, and phylogenetic history. In particular, the relatively high acuity of T. syrichta and Galago senegalensis suggests that visual predation may be an important selective factor favoring high visual acuity in primates. Am. J. Primatol. 71:343–352, 2009. © 2009 Wiley‐Liss, Inc." @default.
• W2027183670 created "2016-06-24" @default.
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• W2027183670 date "2009-01-29" @default.
• W2027183670 modified "2023-10-07" @default.
• W2027183670 title "Visual acuity in the cathemeral strepsirrhine<i>Eulemur macaco flavifrons</i>" @default.
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• W2027183670 doi "https://doi.org/10.1002/ajp.20665" @default.
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