This page is a reference documentation. It only explains the function signature, and not how to use it. Please refer to the user guide for the big picture.


nilearn.datasets.fetch_megatrawls_netmats(dimensionality=100, timeseries='eigen_regression', matrices='partial_correlation', data_dir=None, resume=True, verbose=1)[source]#

Download and return Network Matrices data from MegaTrawls release in HCP.

This data can be used to predict relationships between imaging data and non-imaging behavioural measures such as age, sex, education, etc. The network matrices are estimated from functional connectivity datasets of 461 subjects. Full technical details in references.

More information available in Smith et al.[1], Smith et al.[2], Filippini et al.[3], Smith et al.[4], and O’Reilly et al.[5].

dimensionalityint, default=100

Valid inputs are 25, 50, 100, 200, 300. By default, network matrices estimated using Group ICA brain parcellation of 100 components/dimensions will be returned.

timeseriesstr, default=’eigen_regression’

Valid inputs are ‘multiple_spatial_regression’ or ‘eigen_regression’. By default ‘eigen_regression’, matrices estimated using first principal eigen component timeseries signals extracted from each subject data parcellations will be returned. Otherwise, ‘multiple_spatial_regression’ matrices estimated using spatial regressor based timeseries signals extracted from each subject data parcellations will be returned.

matricesstr, default=’partial_correlation’

Valid inputs are ‘full_correlation’ or ‘partial_correlation’. By default, partial correlation matrices will be returned otherwise if selected full correlation matrices will be returned.

data_dirpathlib.Path or str, optional

Path where data should be downloaded. By default, files are downloaded in a nilearn_data folder in the home directory of the user. See also nilearn.datasets.utils.get_data_dirs.

resumebool, default=True

Whether to resume download of a partly-downloaded file.

verboseint, default=1

Verbosity level (0 means no message).


Dictionary-like object, the attributes are :

  • ‘dimensions’: int, consists of given input in dimensions.

  • ‘timeseries’: str, consists of given input in timeseries method.

  • ‘matrices’: str, consists of given type of specific matrices.

  • ‘correlation_matrices’: ndarray, consists of correlation matrices based on given type of matrices. Array size will depend on given dimensions (n, n).

  • ‘description’: data description


See description for terms & conditions on data usage.