Welcome to klusta
klusta is an open source software for automatic spike sorting. It has been designed to scale up to recordings made with probes containing a few dozen channels.
Overview
As an input, klusta takes a flat binary file containing the analog multi-channel signal. It performs two consecutive steps:
- Spike detection: detecting the action potentials across all channels, using a flood-fill algorithm.
- Automatic clustering: grouping the spikes into putative neuronal sources. Spikes that look similar are expected to stem from the same neuron.
At the end of the process, you are ready to visualize and fine-tune the data using one of the two GUIs we have developed: KlustaViewa (older) or the Kwik GUI (newer and experimental).
The entire process has been described in our paper.
Installation
Test dataset
Once installed, you can try the software on test data.
Download and save these two files in a new directory on your computer:
Then, open a terminal in that directory and type the following commands (do not type the $
):
$ source activate klusta # omit the `source` on Windows
$ klusta hybrid_10sec.prm
The process should finish after about 20 seconds.
File format
The results are saved in two new files:
- A .kwik file: this file contains all the results of the spike sorting session, except the PCA features: mainly the spike times and spike clusters, and all the metadata.
- A .kwx file: this file contains the PCA features.
These files are HDF5 files in the Kwik format. You can open them with any HDF5 reader and with any programming language.
You can have a quick look inside a .kwik
file with the following command:
$ klusta hybrid_10sec.kwik
Kwik file hybrid_10sec.kwik
Recordings 1
List of shanks 0*
Clusterings main*, original
Channels 32
Spikes 1653
Clusters 18
Duration 10s
Using the GUI
You can use one of the two GUIs we have developed to inspect and refine the results manually.
With KlustaViewa
Type the following:
klustaviewa hybrid_10sec.kwik
With the phy KwikGUI
Type the following:
phy kwik-gui hybrid_10sec.kwik