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Klusters reads electrophysiological data from a set of files. Each of these files has a name of the form base.ext.n, where base stands for the common base name of all files belonging to a single recording session, ext is a three-letter extension describing the type of data stored in the file, and n stands for the ID of the particular group of electrodes from which the data was recorded. Thus, using this convention the cluster file for tetrode 2 of session CS150612 would be named CS150612.clu.2.
More specifically, the data files are organized as described in the following sections.
Note that the general and specific parameter files will likely be simplified and consolidated in the future.
Generic file name: base.clu.n
Format: ASCII
The cluster file lists the cluster ID of each spike, one per line. The first line contains the total number of clusters. Assuming N spikes (spike1...spikeN), this file looks like:
nbClusters clusterID_spike1 clusterID_spike2 clusterID_spike3 ... clusterID_spikeN
Notice that the last line must end with a newline or carriage return.
Generic file name: base.fet.n
Format: ASCII, integer values
The feature file lists for each spike the PCA coefficients for each electrode, followed by the timestamp of the spike (more features can be inserted between the PCA coefficients and the timestamp). The first line contains the number of dimensions. Assuming N1 spikes (spike1...spikeN1), N2 electrodes (e1...eN2) and N3 coefficients (c1...cN3), this file looks like:
nbDimensions c1_e1_spike1 c2_e1_spike1 ... cN3_e1_spike1 c1_e2_spike1 ... cN3_eN2_spike1 timestamp_spike1 c1_e1_spike2 c2_e1_spike2 ... cN3_e1_spike2 c1_e2_spike2 ... cN3_eN2_spike2 timestamp_spike2 ... c1_e1_spikeN1 c2_e1_spikeN1 ... cN3_e1_spikeN1 c1_e2_spikeN1 ... cN3_eN2_spikeN1 timestamp_spikeN1The timestamp is expressed in multiples of the sampling interval. For instance, for a 20kHz recording (50 microsecond sampling interval), a timestamp of 200 corresponds to 200x0.000050s=0.01s from the beginning of the recording session.
Notice that the last line must end with a newline or carriage return.
Generic file name: base.spk.n
Format: 16 or 32 bit binary
The spike file describes the waveform of each spike. Assuming N1 spikes (spike1...spikeN1), N2 electrodes (electrode1...electrodeN2) and N3 samples per spike (sample1...sampleN3), the data are stored as follows:
sample1_electrode1_spike1 sample1_electrode2_spike1 ... sample1_electrodeN2_spike1 sample2_electrode1_spike1 sample2_electrode2_spike1 ... sample2_electrodeN2_spike1 ... sampleN3_electrodeN2_spike1 ... sample1_electrode1_spikeN1 ... sampleN3_electrodeN2_spikeN1
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