Exploring Brain Mechanism of Judging Consonance of Intervals in Musicians: from EEG to fMRI

  • 簡 偉哲

Student thesis: Master's Thesis

Abstract

Pleasurability known as sensory consonance which is widely regarded as being associated with some regions of the brain such as auditory cortex Brain plasticity is the ability of a brain to change its structure and function and the major factor including experience and training Musician’s brain received long-term musical training is also regarded as an ideal model to investigate plasticity of the human brain The consonance of interval is a most significant general concept of western tonal music Some studies indicated that cortical processing of musical consonance conforms to consonance of interval for musicians This study aims at exploring this cognitive process by behavior experiment ERPs and fMRI and the cross-exploration between each experiment In order to reduce the interference of noise caused by MRI sparse sampling is used for auditory fMRI In the behavior experiment even if the interference of noise the average accuracy of musicians is still over 80% and there is no significant trend between the situation inside and outside MRI room In the ERPs analysis there are N1 P2 and N2 components N1 sources are in localized in the region of the primary auditory cortex P2 sources are localized in the region of the secondary auditory cortex and N2 sources are in localized in the region of anterior cingulate cortex (ACC) Considering the consonance type the P2 amplitude evoked by consonant intervals was stronger than by dissonant intervals from musicians and has a significant trend; In the fMRI analysis we find that for both consonance and dissonance stimuli activations are all including frontal lobe temporal lobe parietal lobe and occipital lobe and left lateralized In the frontal lobe and limbic lobe of left hemisphere haemodynamic response of consonant intervals is stronger than dissonant intervals In the cross-analysis from ERPs to fMRI we find activations including frontal lobe and limbic lobe in the left hemisphere the haemodynamic response to consonant intervals are larger than dissonant intervals The results point out the influence of expertise musicians could accurately categorize the consonant and dissonant intervals and had enhanced in the secondary auditory cortex Furthermore the effect of left lateralized was shown and consonant intervals were found to elicit a larger haemodynamic response in the frontal lobe of left hemisphere
Date of Award2016 Jul 1
Original languageEnglish
SupervisorSheng-Fu Liang (Supervisor)

Cite this

Exploring Brain Mechanism of Judging Consonance of Intervals in Musicians: from EEG to fMRI
偉哲, 簡. (Author). 2016 Jul 1

Student thesis: Master's Thesis