Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 25, Pages 7815-7820Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1509282112
Keywords
visual acuity; V1; primates; vision; pinwheels
Categories
Funding
- National Science Foundation (NSF) [NSF PHY-1444273]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1444273] Funding Source: National Science Foundation
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Three decades ago, Rockel et al. proposed that neuronal surface densities (number of neurons under a square millimeter of surface) of primary visual cortices (V1s) in primates is 2.5 times higher than the neuronal density of V1s in nonprimates or many other cortical regions in primates and nonprimates. This claim has remained controversial and much debated. We replicated the study of Rockel et al. with attention to modern stereological precepts and show that indeed primate V1 is 2.5 times denser (number of neurons per square millimeter) than many other cortical regions and nonprimate V1s; we also show that V2 is 1.7 times as dense. As primate V1s are denser, they have more neurons and thus more pinwheels than similar-sized nonprimate V1s, which explains why primates have better visual acuity.
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