Non-linear dimensionality reduction on extracellular waveforms reveals cell type diversity in premotor cortex
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Published version
Date
2021-08-06
Authors
Lee, Eric Kenji
Balasubramanian, Hymavathy
Tsolias, Alexandra
Anakwe, Stephanie Udochukwu
Medalla, Maria
Shenoy, Krishna V.
Chandrasekaran, Chandramouli
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Published version
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Citation
E.K. Lee, H. Balasubramanian, A. Tsolias, S.U. Anakwe, M. Medalla, K.V. Shenoy, C. Chandrasekaran. "Non-linear dimensionality reduction on extracellular waveforms reveals cell type diversity in premotor cortex." eLife, Volume 10, e67490. https://doi.org/10.7554/elife.67490
Abstract
Cortical circuits are thought to contain a large number of cell types that coordinate to produce behavior. Current in vivo methods rely on clustering of specified features of extracellular waveforms to identify putative cell types, but these capture only a small amount of variation. Here, we develop a new method (WaveMAP) that combines non-linear dimensionality reduction with graph clustering to identify putative cell types. We apply WaveMAP to extracellular waveforms recorded from dorsal premotor cortex of macaque monkeys performing a decision-making task. Using WaveMAP, we robustly establish eight waveform clusters and show that these clusters recapitulate previously identified narrow- and broad-spiking types while revealing previously unknown diversity within these subtypes. The eight clusters exhibited distinct laminar distributions, characteristic firing rate patterns, and decision-related dynamics. Such insights were weaker when using feature-based approaches. WaveMAP therefore provides a more nuanced understanding of the dynamics of cell types in cortical circuits.
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© 2021, Lee et al. This article is distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use and redistribution provided that the original author and source are credited.