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Updated: Aug 14, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
Published on: February 19, 2014
Auditory cortex in the marsupial possum Trichosurus vulpecula
This study mapped the auditory cortex of the possum Trichosurus vulpecula, revealing a single auditory field with an unusual frequency organization unlike other mammals.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Comparative Neuroanatomy
Background:
- The auditory cortex organization varies across mammalian species.
- Marsupials, like the possum Trichosurus vulpecula, present a unique evolutionary lineage for studying brain structure and function.
Purpose of the Study:
- To investigate the functional organization of the auditory cortex in the acallosal marsupial possum, Trichosurus vulpecula.
- To identify auditory fields and map the representation of sound frequencies within the cortex.
Main Methods:
- Microelectrode mapping of the auditory cortex in Trichosurus vulpecula.
- Recording single unit and unit cluster responses, as well as evoked potentials.
- Utilizing Pontamine sky-blue marking for precise localization of recording sites.
Main Results:
- Identification of a single auditory field within the mapped cortex.
- Sampling of 98 units with best frequencies ranging from 330 Hz to 39 kHz.
- Discovery of an orderly tonotopic map with high frequencies dorsally and low frequencies ventrally, differing from other mammals.
Conclusions:
- The auditory cortex of Trichosurus vulpecula exhibits a unique tonotopic organization.
- This finding contributes to understanding the diversity of auditory processing in mammals.
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