Benchmarking spike source localization algorithms in high density probes

TL;DR

This paper benchmarks various neuron localization algorithms using simulated and experimental datasets, revealing trade-offs between model complexity and robustness for brain-machine interface applications.

Contribution

It provides the first comprehensive benchmarking framework for neuron localization algorithms, comparing accuracy, robustness, and runtime across different conditions.

Findings

Complex models excel in ideal conditions

Simple heuristics are more robust to noise and electrode decay

Performance differences are significant across algorithms

Abstract

Estimating neuron location from extracellular recordings is essential for developing advanced brain-machine interfaces. Accurate neuron localization improves spike sorting, which involves detecting action potentials and assigning them to individual neurons. It also helps monitor probe drift, which affects long-term probe reliability. Although several localization algorithms are currently in use, the field is nascent and arguments for using one algorithm over another are largely theoretical or based on visual analysis of clustering results. We present a first-of-its-kind benchmarking of commonly used neuron localization algorithms. We tested these algorithms using two ground truth datasets: a biophysically realistic simulated dataset, and experimental data combining patch-clamp and Neuropixels probes. We systematically evaluate the accuracy, robustness, and runtime of these algorithms in ideal conditions and long-term recording conditions with electrode decay. Our findings highlight significant performance differences; while more complex and physically realistic models perform better in ideal situations, simple heuristics demonstrate superior robustness to noise and electrode degradation in experimental datasets, making them more suitable for long-term neural recordings. This work provides a framework for assessing localization algorithms and developing robust, biologically grounded algorithms to advance the development of brain-machine interfaces.