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misc.io.eepbin

Module: misc.io.eepbin

Inheritance diagram for mvpa.misc.io.eepbin:

Reader for binary EEP files.

EEPBin

class mvpa.misc.io.eepbin.EEPBin(source)

Bases: mvpa.misc.io.base.DataReader

Read-access to binary EEP files.

EEP files are used by eeprobe a software for analysing even-related potentials (ERP), which was developed at the Max-Planck Institute for Cognitive Neuroscience in Leipzig, Germany.

http://www.ant-neuro.com/products/eeprobe

EEP files consist of a plain text header and a binary data block in a single file. The header starts with a line of the form

‘;%d %d %d %g %g’ % (Nchannels, Nsamples, Ntrials, t0, dt)

where Nchannels, Nsamples, Ntrials are the numbers of channels, samples per trial and trials respectively. t0 is the time of the first sample of a trial relative to the stimulus onset and dt is the sampling interval.

The binary data block consists of single precision floats arranged in the following way:

<trial1,channel1,sample1>,<trial1,channel1,sample2>,...
<trial1,channel2,sample1>,<trial1,channel2,sample2>,...
.
<trial2,channel1,sample1>,<trial2,channel1,sample2>,...
<trial2,channel2,sample1>,<trial2,channel2,sample2>,...

Read EEP file and store header and data.

Parameters:source (str) – Filename.

channels

List of channel names

dt

Time difference between two adjacent samples

nchannels

Number of channels

nsamples

Number of trials/samples

ntimepoints

Number of data timepoints

t0

Relative start time of sampling interval