MEG dataset collected for a study on age-related changes in hearing. Older and younger subjects with clinically normal hearing listened to 60 second narrations of an English audiobook by a male speaker. This dataset extends the dataset given in http://hdl.handle.net/1903/21184, with the addition of 8 additional subjects. The analysis of original dataset was published in Presacco et. al. 2016a (https://doi.org/10.1152/jn.00372.2016), 2016b (https://doi.org/10.1152/jn.00373.2016).


The dataset consists of the following files:
MEG data:
- Younger MEG -raw.fif files
- Older MEG -raw.fif files
- bad_channels.txt : saturating MEG channels to exclude
fwd_solutions:
- MNE forward solution -fwd.fif files for the surface source space (ico-4) and volume source space (vol-7-cortex_brainstem_full) that includes the Brainstem
stimuli:
- The stimulus .wav files
- The auditory spectrogram representation of the stimulus (Yang et. al. https://doi.org/ 10.1109/18.119739)

Description of the MEG experimental data measured using the KIT MEG system:
MEG data has 193 channels, with 1kHz sampling frequency
- 1-157 are MEG channels
- 158-160 are reference channels
- 161-193 are trigger channels
Saturating channels were removed and the data was filtered using TSPCA (de Cheveign‚ and Simon 2007 https://doi.org/10.1016/j.jneumeth.2007.06.003) and SNS (de Cheveign‚ and Simon 2008 https://doi.org/ 10.1016/j.jneumeth.2007.09.012). The list of saturating channels for each subject are provided in bad_channels.txt

Subjects were listening to 60 second portions of male narration of an audiobook (experiment described in detail in Presacco et. al. 2016a, 2016b)
Trial 1: 3 repetitions of the 60 second stimulus Trial1.wav
	trigger code 166: stimulus start
	trigger code 163: stimulus end
Trial 2: 3 repetitions of the 60 second stimulus Trial2.wav
      trigger code 171: stimulus start
	trigger code 163: stimulus end