Complexity of frequency receptive fields predicts tonotopic variability across species
- University of Oxford, United Kingdom
Abstract
Primary cortical areas contain maps of sensory features, including sound frequency in primary auditory cortex (A1). Two-photon calcium imaging in mice has confirmed the presence of these global tonotopic maps, while uncovering an unexpected local variability in the stimulus preferences of individual neurons in A1 and other primary regions. Here we show that local heterogeneity of frequency preferences is not unique to rodents. Using two-photon calcium imaging in layers 2/3, we found that local variance in frequency preferences is equivalent in ferrets and mice. Neurons with multipeaked frequency tuning are less spatially organized than those tuned to a single frequency in both species. Furthermore, we show that microelectrode recordings may describe a smoother tonotopic arrangement due to a sampling bias towards neurons with simple frequency tuning. These results help explain previous inconsistencies in cortical topography across species and recording techniques.
Data availability
We have provided our data and Matlab scripts for generating our figures on Dryad: https://doi.org/10.5061/dryad.9ghx3ffd9.
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Complexity of frequency receptive fields predicts tonotopic variability across speciesDryad Digital Repository, doi:10.5061/dryad.9ghx3ffd9.
Article and author information
Author details
Funding
Biotechnology and Biological Sciences Research Council (BB/M010929/1)
- Kerry M M Walker
University Of Oxford (DPAG Early Career Fellowship)
- Kerry M M Walker
Wellcome (WT076508AIA)
- Andrew J King
Wellcome (WT108369/Z/2015/Z)
- Andrew J King
University Of Oxford (Christopher Welch Scholarship)
- Aleksandar Z Ivanov
University Of Oxford (Newton-Abraham Scholarship)
- Mariangela Panniello
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Ethics
Animal experimentation: The animal procedures were approved by the University of Oxford Committee on Animal Care and Ethical Review and were carried out under license from the UK Home Office, in accordance with the Animals (Scientific Procedures) Act 1986 and in line with the 3Rs. Project licence PPL 30/3181 and PIL l23DD2122.
Copyright
© 2020, Gaucher et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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Complexity of frequency receptive fields predicts tonotopic variability across species
eLife 9:e53462.
https://doi.org/10.7554/eLife.53462
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