Sliding refractory period violations (not yet implemented)

Calculation

Compute maximum allowed refractory period violations for all possible refractory periods in recording. Bins of 0.25ms are used in the [IBL] implementation. For each bin, this maximum value is compared with that observed in the recording. In the IBL implementation, a threshold is imposed and a binary value returned (based on whether the unit ‘passes’ the metric). A SpikeInterface implementation is in development.

Expectation and use

Similar to the ISI violations metric, this metric quantifies the number of refractory period violations seen in the recording of the unit. This is an estimate of false positive rate. A high number of violations indicates contamination, so a low value is expected for true units.

Literature

Metric introduced by IBL.

IBL

International Brain Laboratory. “Spike sorting pipeline for the International Brain Laboratory”. 4 May 2022. 9 Jun 2022.

Links to source code

IBL implementation