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misc.io.meg

Module: misc.io.meg

Inheritance diagram for mvpa.misc.io.meg:

IO helper for MEG datasets.

TuebingenMEG

class mvpa.misc.io.meg.TuebingenMEG(source)

Bases: object

Reader for MEG data from line-based textfile format.

This class reads segmented MEG data from a textfile, which is created by converting the proprietary binary output files of a MEG device in Tuebingen (Germany) with an unkown tool.

The file format is line-based, i.e. all timepoints for all samples/trials are written in a single line. Each line is prefixed with an identifier (using a colon as the delimiter between identifier and data). Two lines have a special purpose. The first ‘Sample Number’ is a list of timepoint ids, similar to range(ntimepoints) for each sample/trial (all concatenated into one line. The second ‘Time’ contains the timing information for each timepoint (relative to stimulus onset), again for all trials concatenated into a single line.

All other lines contain various information (channels) recorded during the experiment. The meaning of some channels is unknown. Known ones are:

M*: MEG channels EEG*: EEG channels ADC*: Analog to digital converter output

Dataset properties are available from various class attributes. The data member provides all data from all channels (except for ‘Sample Number’ and ‘Time’) in a NumPy array (nsamples x nchannels x ntimepoints).

The reader supports uncompressed as well as gzipped input files (or other file-like objects).

Reader MEG data from texfiles or file-like objects.

Parameters:source (str | file-like) – Strings are assumed to be filenames (with .gz suffix compressed), while all other object types are treated as file-like objects.