Dissertation > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > General issues

Study of Event Related Potentials Based on Chinese Auditory Cognition

Author ShenJiangTao
Tutor LiXiaoXia
School Hebei University of Technology
Course Electrical Engineering
Keywords event-related potentials Chinese cognition wavelet analysis auditorystimuli
CLC R318.0
Type Master's thesis
Year 2011
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Language is the advanced function of human brain, the research on languageprocessing brain mechanism is helpful to reveal the mystery of human brain. In this paperevent-related potentials technology has been adopted, using Chinese phonetic to be stimulation,adopting the presentation of hearing, collecting and distilling the AERP. In this paper experimentresult has been analyzed and researched about ERP,BEAM and ERP contrast from differentsimulation.18 Chinese phonetic has been choiced to be simulation, half of them are vowel,othersare phonetic of simple usual Chinese. Collecting the experiment data of one assignmentmodule composed by three phonetic, and distilling the AERP with traditional average andwavelet analysis.According to analyze and research the experiment results, the result has been foundthat all stimulations and all corresponding ERP waveform have the same phenomena. In0~300ms segment the waveform is bigger than other time; in 300~850ms segment the wave crestis smaller than the front but the waveform is stable; after 850ms the waveform range appearsattenuation. The phenomena is possibly related to the brain reflection to the sound of hearing,when a stimulation appears, the subject incepts the sound signal, the phonetic has been reflectedcorresponding to the sound in the subject’s brain firstly, then a passage of stable time appears,when the sound disappear finally, the subject possibly has his own thinking or mentality activityfor a passage time. Exogenous component which related to stimulation frequency and db P1,N1and endogenous component P300,N2,N400 can be observed inAERPcomponent.There are six function areas related to auditory cognition, they are frontal pole,frontal,parietal,occipital,temporal and central, this result is founded via the analyses of BEAMand waveform range of every electrode. It shows that all the six function areas are needed whena assignment has been done in the brain, furthermore all the six function areas complete theassignment of designating the Chinese cognition by corresponding and completing one another.According to analyses the waveform of different ERP which is responded to phoneticstimulation, whether individual-letter,double-letter,three-letter or Chinese phonetic, the wavecrests are kindred, there are no rule can be followed. It shows that it is very difficult todistinguish the particular content of the information received by the brain from the AERP,requires a lot of research and experiments to further investigate the laws.

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