MEG dataset collected for a study on arithmetic and language processing. Full details of experiment design, stimuli and data preprocessing can be found at https://doi.org/10.1101/2021.01.31.429030

subject_data: MEG and source localization files for 22 young subjects
each subject folder contains following files
- subject_single_speaker_meg-epo.fif: 
	Single Speaker MEG epochs downsampled to 200 Hz
	TSPCA, SNS, 0.3-40 Hz FIR filter, and ICA preprocessing was applied. 
	Contains 40 single speaker epochs. Equations: epochs 1-10, 21-30, Sentences: epochs 11-20, 31-40
- subject_cocktail_meg-epo.fif: 
	Cocktail Party epochs downsampled to 200 Hz
	TSPCA, SNS, 0.3-40 Hz FIR filter, and ICA preprocessing was applied. 
	Contains 48 cocktail party epochs. Equations: epochs 7-12, 19-24, 31-36, 43-48, Sentences: epochs 1-6, 13-18, 25-30, 37-42
- sourcespace folder: MRIs are reconstructed by scaling the FreeSurfer fsaverage brain. This can be done using the `mne.scale_mri` function.
    - subject_vol-12-cortex-fwd.fif: Forward solution
    - subject_single_speaker_noise-cov.fif: Noise covariance for single speaker (with same preprocessing as the single speaker MEG epochs)
    - subject_cocktail_party_noise-cov.fif: Noise covariance for cocktail party (with same preprocessing as the cocktail party MEG epochs)
    - subject-trans.fif: coregistration between MEG sensor space and (scaled) MRI spac
    - MRI scaling parameters.cfg: scaling parameters from fsaverage

stimuli:
The stimuli were presented using fixed rates with two speakers (male: james, and female: kate). See https://doi.org/10.1101/2021.01.31.429030 for full details
single_speaker_stimuli: contains the 4 single speaker blocks. 
cocktail_party_stimuli: contains the 8 cocktail party blocks.
Each block has the trial .wav files, as well as a trials.csv file with a list of the sentences and equations presented. 
Cocktail party blocks have foreground (fg), background (bg), and mix .wav files. Only the mix .wav file was presented to the subjects

The order of the blocks was changed across subjects to counterbalance the sex of the speakers. The block numbers for each order are given below
Male first: 
	block order: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
	subjects: 'R2522', 'R2566', 'R2568', 'R2571', 'R2572', 'R2574', 'R2576', 'R2579', 'R2582', 'R2584', 'R2585', 'R2588'
Female first: 
	block order: 3, 4, 1, 2, 7, 8, 5, 6, 11, 12, 9, 10
	subjects: 'R2567', 'R2569', 'R2570', 'R2573', 'R2575', 'R2578', 'R2581', 'R2583', 'R2586', 'R2587', 'R2589'