Audio-tactile syllables EEG Dataset

Dataset setting out to investigate behavioural and EEG responses to syllables coupled with tactile pulses at a 5Hz rhythm. The raw behavioural and EEG data is provided here.

#Introduction

This dataset contains the behavioural response to one syllable discrimination task in which subjects were subjected to regular tactile stimuli followed by a syllable in noise. It also contains the EEG response recorded during the task. There were 16 subjects, which IDs are :  'camembert', 'leader', 'bristol', 'policeman', 'frenchship', 'preacher', 'pretzel2new', 'canada', 'rotiqueen', 'kitten', 'batman', '2d', 'laundry2', 'bearcub', 'stopwatch' and 'tala'.

#Content

The dataset contains a folder named after each subject: these contain the eeg recordings for each of them as well as behavioural data. 

id_Entrainment.csv: This csv file contains all the behvioural data about the subject (id). The different fields are as follow:

Trial: The ID of the current trial

Type: Whether the tactile stimuli was audio-tactile rhythmic, audio-tactile random or audio-only

Phase: In case it is audio-tactile, what is the phase between the onset of the vowel and the tactile rhythm. Note that we refer here to the phase relative to the rhythm of the tactile stimuli and not a measured rhythm. This choice was made as to sample the delays between audio and tactile as to be between 1 and 2 periods away from the rhythm we would expect to emerge from brain activity. The four phases can easily be translated to the following audio-tactile delays between the last tactile pulse and the onset of the syllable as: 150ms, 200ms, 250ms, 300ms.

Score: 1 if the right syllable was selected by the subject, 0 otherwise.

Syllable: the presented syllable out of the following set: ka, ga, ba, pa, da, ta

Gender: The gender of the speaking voice, m for male, f for female

Shift: A random shift between the onset of the trial and the first tactile pulse. Note that this value is representing the number of samples at a sampling frequency of 39062.5 (imposed by our hardware: TDT RX8)

Random: The number of the random tactile stimulation. Since these were generated procedurally, we recorded them for reference, however, they do not play a part in the analysis. 

id.eeg, id.vhdr, id.vmrk: These correspond to the recorded data. More information on these file formats can be found on the Brian vision webpage. 

#EEG Data Format

We recorded continuous EEG from the participants over an hour at 1kHz. 

In addition to the 63 channels, there is also Stimtrack channel labelled as 'Sound' which was tracking an addition of the auditory and tactile stimuli and allowed to track the sent stimuli as well as the alignment. The corresponding files can be found using the provided .csv file.

 The .vmrk file provided contains the timing of the triggers sent at the start of each trial and can help with tracking the progress in the experiment.