.. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_limo_examples_group_level_plot_spatiotemporal_tfce.py: ========================================================= Plot significance t-map for effect of continuous variable ========================================================= .. code-block:: default # Authors: Jose C. Garcia Alanis # # License: BSD (3-clause) import numpy as np from sklearn.linear_model import LinearRegression from mne.stats.cluster_level import _find_clusters,_setup_connectivity from mne.channels import find_ch_connectivity from mne.datasets import limo from mne.decoding import Vectorizer, get_coef from mne.evoked import EvokedArray from mne import combine_evoked Here, we'll import multiple subjects from the LIMO-dataset and compute group-level beta-coefficients for a continuous predictor, in addition we show how confidence (or significance) levels can be computed for this effects using the bootstrap-t technique and spatiotemporal clustering and threshold-free cluster enhancement .. code-block:: default # list with subjects ids that should be imported subjects = range(1, 19) # create a dictionary containing participants data for easy slicing limo_epochs = {str(subj): limo.load_data(subject=subj) for subj in subjects} # interpolate missing channels for subject in limo_epochs.values(): subject.interpolate_bads(reset_bads=True) # only keep eeg channels subject.pick_types(eeg=True) .. rst-class:: sphx-glr-script-out Out: .. code-block:: none 1055 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1052 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1072 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1050 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1118 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1108 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1060 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1030 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1059 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1038 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1029 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 943 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1108 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 998 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1076 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1061 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1098 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped 1103 matching events found No baseline correction applied Adding metadata with 2 columns 0 projection items activated 0 bad epochs dropped Computing interpolation matrix from 113 sensor positions Interpolating 15 sensors Computing interpolation matrix from 117 sensor positions Interpolating 11 sensors Computing interpolation matrix from 121 sensor positions Interpolating 7 sensors Computing interpolation matrix from 119 sensor positions Interpolating 9 sensors Computing interpolation matrix from 122 sensor positions Interpolating 6 sensors Computing interpolation matrix from 118 sensor positions Interpolating 10 sensors Computing interpolation matrix from 117 sensor positions Interpolating 11 sensors Computing interpolation matrix from 117 sensor positions Interpolating 11 sensors Computing interpolation matrix from 121 sensor positions Interpolating 7 sensors Computing interpolation matrix from 116 sensor positions Interpolating 12 sensors /home/josealanis/Documents/github/mne-stats/examples/group_level/plot_spatiotemporal_tfce.py:36: RuntimeWarning: No bad channels to interpolate. Doing nothing... subject.interpolate_bads(reset_bads=True) Computing interpolation matrix from 115 sensor positions Interpolating 13 sensors Computing interpolation matrix from 122 sensor positions Interpolating 6 sensors Computing interpolation matrix from 114 sensor positions Interpolating 14 sensors Computing interpolation matrix from 117 sensor positions Interpolating 11 sensors Computing interpolation matrix from 125 sensor positions Interpolating 3 sensors Computing interpolation matrix from 126 sensor positions Interpolating 2 sensors Computing interpolation matrix from 122 sensor positions Interpolating 6 sensors regression parameters .. code-block:: default # variables to be used in the analysis (i.e., predictors) predictors = ['intercept', 'face a - face b', 'phase-coherence'] # number of predictors n_predictors = len(predictors) # save epochs information (needed for creating a homologous # epochs object containing linear regression result) epochs_info = limo_epochs[str(subjects[0])].info # number of channels and number of time points in each epoch # we'll use this information later to bring the results of the # the linear regression algorithm into an eeg-like format # (i.e., channels x times points) n_channels = len(epochs_info['ch_names']) n_times = len(limo_epochs[str(subjects[0])].times) # also save times first time-point in data times = limo_epochs[str(subjects[0])].times tmin = limo_epochs[str(subjects[0])].tmin create empty objects for the storage of results .. code-block:: default # place holders for bootstrap samples betas = np.zeros((len(limo_epochs.values()), n_channels * n_times)) # dicts for results evoked-objects betas_evoked = dict() t_evokeds = dict() run regression analysis for each subject .. code-block:: default # loop through subjects, set up and fit linear model for iteration, subject in enumerate(limo_epochs.values()): # --- 1) create design matrix --- # use epochs metadata design = subject.metadata.copy() # add intercept (constant) to design matrix design = design.assign(intercept=1) # effect code contrast for categorical variable (i.e., condition a vs. b) design['face a - face b'] = np.where(design['face'] == 'A', 1, -1) # order columns of design matrix design = design[predictors] # column of betas array (i.e., predictor) to run bootstrap on pred_col = predictors.index('phase-coherence') # --- 2) vectorize (eeg-channel) data for linear regression analysis --- # data to be analysed data = subject.get_data() # vectorize data across channels Y = Vectorizer().fit_transform(data) # --- 3) fit linear model with sklearn's LinearRegression --- # we already have an intercept column in the design matrix, # thus we'll call LinearRegression with fit_intercept=False linear_model = LinearRegression(fit_intercept=False) linear_model.fit(design, Y) # --- 4) extract the resulting coefficients (i.e., betas) --- # extract betas coefs = get_coef(linear_model, 'coef_') # only keep relevant predictor betas[iteration, :] = coefs[:, pred_col] # the matrix of coefficients has a shape of number of observations in # the vertorized channel data by number of predictors; # thus, we can loop through the columns i.e., the predictors) # of the coefficient matrix and extract coefficients for each predictor # in order to project them back to a channels x time points space. lm_betas = dict() # extract coefficients beta = betas[iteration, :] # back projection to channels x time points beta = beta.reshape((n_channels, n_times)) # create evoked object containing the back projected coefficients lm_betas['phase-coherence'] = EvokedArray(beta, epochs_info, tmin) # save results betas_evoked[str(subjects[iteration])] = lm_betas # clean up del linear_model compute mean beta-coefficient for predictor phase-coherence .. code-block:: default # subject ids subjects = [str(subj) for subj in subjects] # extract phase-coherence betas for each subject phase_coherence = [betas_evoked[subj]['phase-coherence'] for subj in subjects] # average phase-coherence betas weights = np.repeat(1 / len(phase_coherence), len(phase_coherence)) ga_phase_coherence = combine_evoked(phase_coherence, weights=weights) compute bootstrap confidence interval for phase-coherence betas and t-values .. code-block:: default # set random state for replication random_state = 42 random = np.random.RandomState(random_state) # number of random samples boot = 2000 # place holders for bootstrap samples cluster_H0 = np.zeros(boot) f_H0 = np.zeros(boot) # setup connectivity n_tests = betas.shape[1] connectivity, ch_names = find_ch_connectivity(epochs_info, ch_type='eeg') connectivity = _setup_connectivity(connectivity, n_tests, n_times) # threshold parameters for clustering threshold = dict(start=.1, step=.1) # run bootstrap for regression coefficients for i in range(boot): # extract random subjects from overall sample resampled_subjects = random.choice(range(betas.shape[0]), betas.shape[0], replace=True) # resampled betas resampled_betas = betas[resampled_subjects, :] # compute standard error of bootstrap sample se = resampled_betas.std(axis=0) / np.sqrt(resampled_betas.shape[0]) # center re-sampled betas around zero resampled_betas -= betas.mean(axis=0) # compute t-values for bootstrap sample t_val = resampled_betas.mean(axis=0) / se # transfrom to f-values f_vals = t_val ** 2 # transpose for clustering f_vals = f_vals.reshape((n_channels, n_times)) f_vals = np.transpose(f_vals, (1, 0)) f_vals = f_vals.reshape((n_times * n_channels)) # compute clustering on squared t-values (i.e., f-values) clusters, cluster_stats = _find_clusters(f_vals, threshold=threshold, connectivity=connectivity, tail=1) # save max cluster mass. Combined, the max cluster mass values from # computed on the basis of the bootstrap samples provide an approximation # of the cluster mass distribution under H0 if len(clusters): cluster_H0[i] = cluster_stats.max() else: cluster_H0[i] = np.nan # save max f-value f_H0[i] = f_vals.max() print('find clusters for bootstrap sample %i' % i) .. rst-class:: sphx-glr-script-out Out: .. code-block:: none Could not find a connectivity matrix for the data. 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sample 1998 find clusters for bootstrap sample 1999 estimate t-test based on original phase coherence betas .. code-block:: default # estimate t-values and f-values se = betas.std(axis=0) / np.sqrt(betas.shape[0]) t_vals = betas.mean(axis=0) / se f_vals = t_vals ** 2 # transpose for clustering f_vals = f_vals.reshape((n_channels, n_times)) f_vals = np.transpose(f_vals, (1, 0)) f_vals = f_vals.reshape((n_times * n_channels)) # find clusters clusters, cluster_stats = _find_clusters(f_vals, threshold=threshold, connectivity=connectivity, tail=1) compute cluster significance and get mask por plot here, we use the distribution of cluster mass bootstrap values .. code-block:: default cluster_thresh = np.quantile(cluster_H0, [.99], axis=0) # xlsuers above alpha level sig_mask = cluster_stats > cluster_thresh back projection to channels x time points .. code-block:: default t_vals = t_vals.reshape((n_channels, n_times)) f_vals = np.transpose(f_vals.reshape((n_times, n_channels)), (1, 0)) sig_mask = np.transpose(sig_mask.reshape((n_times, n_channels)), (1, 0)) create evoked object containing the resulting t-values .. code-block:: default group_t = dict() group_t['phase-coherence'] = EvokedArray(t_vals, epochs_info, tmin) # electrodes to plot (reverse order to be compatible whit LIMO paper) picks = group_t['phase-coherence'].ch_names[::-1] # plot t-values, masking non-significant time points. fig = group_t['phase-coherence'].plot_image(time_unit='s', picks=picks, mask=sig_mask, xlim=(-.1, None), unit=False, # keep values scale scalings=dict(eeg=1)) fig.axes[1].set_title('T-value') fig.axes[0].set_title('Group-level effect of phase-coherence') fig.set_size_inches(7, 4) .. image:: /limo_examples/group_level/images/sphx_glr_plot_spatiotemporal_tfce_001.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-timing **Total running time of the script:** ( 133 minutes 31.569 seconds) .. _sphx_glr_download_limo_examples_group_level_plot_spatiotemporal_tfce.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download :download:`Download Python source code: plot_spatiotemporal_tfce.py ` .. container:: sphx-glr-download :download:`Download Jupyter notebook: plot_spatiotemporal_tfce.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_