Supplementary Material for "Sonification for EEG Data Analysis"

This paper presents techniques to render acoustic representations for EEG data. In our case, data are obtained from psycholinguistic experiments where subjects are exposed to three different conditions based on different auditory stimuli. The goal of this research is to uncover elements of neural processing correlated with high-level cognitive activity. Three sonifications are presented within this paper: spectral mapping sonification which offers a quite direct inspection of the recorded data, distance matrix sonification which allows to detect nonlinear long range correlations at high time resolution, and differential sonification which summarizes the comparison of EEG measurements under different conditions for each subject. This paper describes the techniques and presents sonification examples for experimental data. #### Sound Demonstrations for the presented EEG data sonification techniques * Table 1: <br> Audification of EEG data (2 electrodes, 3 subjects and all 3 conditions). Besides the dominating noise, pitched spikes can be heard File/Track: S1:: EEGr: Fp1, T5, Fp1/T5, speech: Fp1, T5, Fp1/T5 , pseudo: Fp1/T5<br> S2:: EEGr: Fp1, T5, Fp1/T5, speech: Fp1, T5, Fp1/T5 , pseudo: Fp1/T5<br> S3:: EEGr: Fp1, T5, Fp1/T5, speech: Fp1, T5, Fp1/T5 , pseudo: Fp1/T5 Description: Audification of EEG Data for two electrodes (Fp1 and T5) for subjects S1, S2 and S3 Duration: 1 s * Table 2: <br> Sound examples for Spectral Mapping Sonification of EEG data, for pseudo speech and speech condition in a sequence with a short gap in between of 2.5 s in real-time. File/Track: delta=0.4, [0-30Hz], left: T3,T5, right: T4,T6 <br> S1 S2 S3 S4 S5 S6 <br> delta=0, [0-30Hz], left: T3,T5, right: T4,T6 <br> S1 S2 S3 S4 S5 S6<br> delta=0, [0-30Hz], left: F7,F3,T3,C3,T5,P3, right: F4,F8,C4,T4,T6,P4<br> S1 S2 S3 S4 S5 S6 Description: Spectral Mapping Sonification of EEG data Duration: about 4 s * Table 3: <br> Sound examples for Distance Matrix Sonification of spectral vectors. High-pitched loud tones indicate long-range frequency selective couplings File/Track: frequency range 8-20 Hz, subjects: S1 S2 S3 S4 S5 S6 Description: Distance Matrix Sonification for concatenated datasets for the pseudospeech and speech condition. A noise burst separates the two parts Duration: 5 s * Sound Example: [Ex-DiffSon-1](https://pub.uni-bielefeld.de/download/2704060/2704108), Differential Sonification for Example shown as spectrogram <br> * Table 4: <br> Sound examples for Differential Sonifications File/Track: pseudospeech-speech (1s): <br> S1, S2, S3, S4, S5, S6 <br> same with higher threshold (1s): <br> S1, S2, S3, S4, S5, S6 <br> speech - EEGr (1s): <br> S1, S2, S3, S4, S5, S6 <br> pseudospeech-speech (4s): <br> S1, S2, S3, S4, S4, S6 <br> Description: Differential Sonification of EEG data Duration: 1 s and 4 s