RAW DATA form - Speech Auditory Brainstem Responses: Effects of Background, Stimulus Duration, Consonant-Vowel, and Number of Epochs

<strong>Speech Auditory Brainstem Responses: Effects of Background, Stimulus Duration, Consonant-Vowel, and Number of Epochs</strong> Ghada BinKhamis, Agnès Léger, Steven L. Bell, Garreth Prendergast, Martin O’Driscoll, and Karolina Kluk <strong>doi: 10.1097/AUD.0000000000000648</strong> <em>(<strong>Please site above article)</strong></em> <strong>Description of raw EEG (speech-ABR) data main folder, subfolders, and raw EEG files</strong> <strong>Folder Information</strong> <strong>Main folder:</strong> Contains 144 subfolders with raw data from 12 participants <strong>Subfolder names:</strong> Each subfolder starts with the participant code S01, S02, S03, S04, S05, S06, S07, S08, S09, S10, S11, S12 Next is the stimulus duration: 40ms, 50ms, 170ms Next is the CV used to evoke speech-ABRs ba, da, ga And finally the background condition quiet, noise <strong>Example subfolder names:</strong> <em>S01 40ms da noise:</em>Participant number 1, speech-ABRs in response to the 40ms [da] in background noise <em>S07 170ms ga quiet:</em>Participant number 7, speech-ABRs in response to the 170ms [ga] in quiet <strong>Each participant has 12 subfolders:</strong> S__ 40ms da quiet S__ 40ms da noise S__ 50ms da quiet S__ 50ms da noise S__ 50ms ba quiet S__ 50ms ba noise S__ 50ms ga quiet S__ 50ms ga noise S__ 170ms da quiet S__ 170ms da noise S__ 170ms ba quiet S__ 170ms ga quiet <strong>Each participant subfolder contains four ‘.mat’ files, ‘.mat’ file names:</strong> Each ‘.mat’ file starts with the participant code S01, S02, S03, S04, S05, S06, S07, S08, S09, S10, S11, S12 Next is the stimulus duration: 40ms, 50ms, 170ms Next is the CV used to evoke speech-ABRs ba, da, ga Next is ‘noise’ if background condition was noise Next is the stimulus polarity Pos for positive/standard Neg for negative (reversed polarity stimulus) And finally is the recording number for that polarity R1 is the first recording R2 is the second recording <strong>Example ‘.mat’ file name:</strong> <em>S04 50 ba Neg R1:</em>Participant number 4, speech-ABR in response to the 50ms [ba] in quiet, reversed polarity stimulus, recording number one <em>S02 40 da noise Pos R2:</em>Participant number 2, speech-ABR in response to the 40ms [da] in background noise, standard/positive stimulus, recording number two <strong>File Information:</strong> <strong>Description of ‘.mat’ files that can be accessed and processed using MATLAB (MathWorks):</strong> Each ‘.mat’ file is a structure that contains the following fields: The first nine fields are informational, for example: xunits: ‘s’ indicates that the recording time window is in seconds, conversion to milliseconds would be required to plot the data in milliseconds start: ‘0’ indicates that both stimulus and recording start at 0 seconds points: <strong>1800</strong>is the number of sample points for speech-ABRs to the 40ms da, this number will be <strong>2200</strong>for the speech-ABRs to the 50ms stimuli (ba, da, ga), and <strong>4600</strong>for the speech-ABRs to the 170ms stimuli (ba, da, ga) chans: 2 is the number of channels (channel 2 is the ipsilateral channel) frames: 3000 is the number of epochs The last filed <strong>‘values’</strong>is what contains the raw EEG data (1800x2x3000) <strong>1800 </strong>is the number of samples <strong>2 </strong>is the number of channels (channel one is recorded from the left ear lobe (A1) and channel two is from the right ear lobe (A2)) <strong>3000 </strong>is the number of epochs The field <strong>‘values’ </strong>for speech-ABRs to the 50ms stimuli is <strong>2200x2x3000 </strong>and for speech-ABRs to the 170ms stimuli is <strong>4600x2x3000</strong>. Stimulus starts at 0 seconds per epoch, pre-stimulus baseline may be extracted from the end of each epoch (i.e. before the next stimulus). <strong>Data is recorded in Volts and will need to be converted to Micro Volts</strong> <strong>Date of data collection</strong>: May to November 2016