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<a href="http://doi.org/10.1016/j.brainres.2005.03.023" target="_blank" rel="noreferrer noopener">http://doi.org/10.1016/j.brainres.2005.03.023</a>
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Pages
164-174
Issue
1
Volume
1045
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Title
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Is humanlike cytoarchitectural asymmetry present in another species with complex social vocalization? A stereologic analysis of mustached bat auditory cortex
Publisher
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Brain Research
Date
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2005
2005-05
Subject
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asymmetry; cerebral-cortex; combination-sensitive neurons; DSCF; hemispheric-specialization; human-brain; japanese macaques; lateralization; mustached bat; neural; Neurosciences & Neurology; planum temporale; pteronotus-parnellii; rhesus-monkeys; social vocalization; stereology; temporal speech region; V1
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Sherwood C C; Raghanti M A; Wenstrup J J
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Considerable evidence suggests that left hemispheric lateralization for language comprehension in humans is associated with cortical microstructural asymmetries. However, despite the fact that left hemispheric dominance for the analysis of species-specific social vocalizations has been reported in several other species, little is known concerning microstructural asymmetries in auditory cortex of nonhumans. To test whether such neuroanatomical lateralization characterizes another species with complex social vocalizations, we performed stereologic analyses of Nissl-stained cells in layer III of area DSCF in mustached bats (Pteronotus parnellii). Area DSCF was selected because it contains neurons which are sensitive to several temporal features of conspecific vocalizations. Primary visual cortex (V I) was also studied as a comparative reference. We measured neuron densities, glial densities, and neuronal volumes in both hemispheres of 10 adult male bats. Results indicate that these variables are not significantly lateralized in area DSCF or V I. Additionally, magnopyramidal cells (i.e., the largest 10% of neurons from both hemispheres) were not asymmetric in their frequency of distribution at the population level. Although several individual bats had asymmetric neuron distributions, consistent hemispheric bias was not evident. Absence of population-level microstructural asymmetry in area DSCF of mustached bats suggests alternative evolutionary scenarios including: (1) microstructural lateralization of auditory cortical circuitry may be a unique adaptation for human language, and (2) the specialized biosonar function of mustached bat auditory cortex may require symmetrical cytoarchitectural structure. Resolution of these alternatives will require further data on the microstructure of auditory cortex in species with lateralized perception of acoustic social communication. (C) 2005 Elsevier B.V. All rights reserved.
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<a href="http://doi.org/10.1016/j.brainres.2005.03.023" target="_blank" rel="noreferrer noopener">10.1016/j.brainres.2005.03.023</a>
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Journal Article
2005
asymmetry
Brain research
cerebral-cortex
combination-sensitive neurons
DSCF
hemispheric-specialization
human-brain
japanese macaques
Journal Article
lateralization
mustached bat
neural
Neurosciences & Neurology
planum temporale
pteronotus-parnellii
Raghanti M A
rhesus-monkeys
Sherwood C C
social vocalization
Stereology
temporal speech region
V1
Wenstrup J J