| Autor: |
J. H. Casseday, D. L. Oliver, L. M. Eisenman |
| Rok vydání: |
1974 |
| Předmět: |
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| Zdroj: |
The Journal of the Acoustical Society of America. 55:481-481 |
| ISSN: |
0001-4966 |
| DOI: |
10.1121/1.3438019 |
| Popis: |
This study is part of an overall effort to understand the evolution of the central auditory system. The tree shrew was studied because of its unique status in phylogeny—it resembles some of the earliest primates. Three methods of defining auditory cortex were compared: (1) cytoarchitecture of the cortex, (2) projections from the medial geniculate nucleus to the cortex, and (3) evoked potentials at the cortex in response to auditory stimuli. Analysis of cytoarchitecture revealed an area of neocortex that resembles primary auditory cortex in other mammals. Anterograde degeneration techniques showed that the projections from the medial geniculate nucleus to the cortex were coextensive with the area defined by cytoarchitecture. The main projection within this cortical area was to layer IV. Using macroelectrodes to record evoked potentials, it was found that this area of neocortex has a short latency response to auditory stimuli. We conclude that we have identified primary auditory cortex in the tree shrew. [S... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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