Analysis of sonification for EEG classification

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Analysis

Analysis of

of Sonification

Sonification for

for EEG

EEG

Classification

Classification

ISTEC General Assembly 2014

STUDENTS: STUDENTS:

 GONZÁLEZ GONZÁLEZ CASTAÑEDA ERICK CASTAÑEDA ERICK FERNANDOFERNANDO

 MScMSc. TORRES GARCÍA ALEJANDRO ANTONIO. TORRES GARCÍA ALEJANDRO ANTONIO

ADVISORS: ADVISORS:

 DR. VILLASEÑOR PINEDA LUISDR. VILLASEÑOR PINEDA LUIS

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Introduction

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 Nearly 200 million people experience some difficulties in motor skills.

 Brain Computer Interfaces (BCI) are an alternative for integrating this people using BCIs and provide them some autonomy.

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Problematic

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 The electrophysiological sources like SCP, P300, VEP, Motor imagery, have a long training period and low rates of communication.

 Exploring the use of Unspoken Speech (or Imagined Speech) as source for BCIs.

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EEG Sonification

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 Sonification (or Auditory display) refers to the use of non-speech audio to transmit information.

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Objective

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Methodology

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Complete Methodology

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Experimentation and Results

7 66,06 38,18 39,39 46,67 61,82 31,52 48,78 66,06 58,79 41,21 73,33 49,70 49,09 32,73 59,39 37,58 49,70 58,79 27,88 75,76 31,52 55,15 47,27 33,33 28,48 41,21 49,39 70,30 40,00 55,76 58,18 75,15 30,91 52,44 73,33 60,61 48,48 83,03 59,39 60,61 41,82 64,85 46,06 55,76 54,55 32,12 73,33 49,70 68,48 57,58 60,00 33,94 44,85 56,10 0,00 10,00 20,00 30,00 40,00 50,00 60,00 70,00 80,00 90,00

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27

Accuracy results using 4 channels and Random Forest

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Conclusions

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 Sonification was applied to transform the EEG signal to an

audio signal.

 The classification accuracy was improved, by choosing

dominant spectrogram frequencies from EEG signal and mapping EEG frequencies to audio frequencies.

 In future work, we will explore using 14 channels and

additional feature extraction methods such as MFCC.

48,10

55,83

0,00 10,00 20,00 30,00 40,00 50,00 60,00

Average

Average accueracy using 4 channels and RF

Figure

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Referencias

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