Benchmarking spike source localization algorithms in high density probes
Fig 5
Impact of localization parameters on median spike localization error.
For MT, we examine the parameters “radius_um” (denoting the radius around the peak channel where signal is considered in optimization) and “max_distance_um” (denoting the max distance from the COM initial estimate considered as a solution to optimization). For GC, we examine the parameters “radius_um” (similarly denoting radius around the peak channel where signal is considered in optimization) and “percentile” (denoting percentage of the best scalar products used to estimate location). For COM, the parameters have less meaningful impact on algorithm performance and so we present the median spike localization error under default parameters. Median error using the default parameters are marked in red boxes, and we examine parameters an order of two lower and higher than the default parameters. In the first four columns, we show the progression of the median localization error as electrode degradation increases, and the colors denoting magnitude of error are normalized within the individual electrode degradation level but across the three localization methods (i.e., normalized within the “column”). We additionally show the change in localization error from 0% to 94% degradation for each method and parameter set in the fifth column, to indicate how much electrode degradation impacts performance. A: Results on the simulated dataset (MEArec). B: Results on the experimental dataset (SPE-1).