Research On The Influence Of Background Music On Spatial Cognitive Working Memory

Music plays a more and more important role in people's life.Whether cognitive activities will be influenced by background music has become a hot topic.Some scholars find that concerts enhance the brain's connectivity and have a positive impact on working memory.Some scholars think that music can only interfere with human cognition and increase the burden of brain processing.In this thesis,we designed working memory EEG experiments under background music,analyzed the sources of the obtained EEG signal,built the cortical brain network based on the reconstructed current density distribution on the cortex,and combined with the power spectrum distribution,in order to analyze the influence of different types of music on spatial cognitive working memory.In this thesis,the EEG experiments of spatial cognition n-back task under classical music,rock music and no music conditions were designed,EEG signals of the volunteers were collected and preprocessed.First,the wavelet decomposition is used to divide the EEG signal into frequency bands,and the fast Fourier transform is used to calculate the power spectrum in each frequency band.Compared with no music state,classical music in the increase of power in ? band,the decrease of ? band,the increase(?+?)/(?+?)and the decrease ?/?,and rock music in the increase of power in ? and ?frequency bands,the decrease(?+?)/(?+?)and the increase ?/?.Both types of music cause the relative power of the ? wave in the EEG signal to be reduced.The power density of ? band in the no-music state and the rock music state is significantly different,and the power density of the ? wave in the classical music state and the rock music state is significantly different.Secondly,the eLORETA was used to reconstruct the sources of the EEG signals,and the current density distributions on the cerebral cortex were obtained.The results showed that the distribution range of brain source current density was concentrated in the right temporal lobe and occipital lobe,but the distribution range was slightly larger and the density value was lower in the background music state.Rock music the activity of right occipital lobe more than classical music and no music.According to the difference statistics of the traceability results,it is found that the difference voxels are mainly distributed in the temporal lobe and occipital lobe of the right brain in the state of no music and background music.Classical music and rock music have different effects on the subjects,and the difference is reflected in the parietal lobe,the right occipital lobe and the side olfactory cortex.Finally,the cross-correlation method was used to construct the brain function network for the signal after reconstruction,and the attribute analysis of the brain network was carried out.The results showed that the difference of peak period after stimulation was mainly in occipital lobe and temporal lobe(P<0.05).The network connection of parietal lobe,occipital lobe and right temporal lobe was significantly higher than that of no music state.Under the condition of no music,the node degree,the betweenness centrality and the clustering coefficient of brain network are less than those of background music,and the global efficiency higher than that of background music.The analysis of behavioral data also found that the spatial cognitive accuracy rate was the highest in the absence of music.Comprehensive analysis shows that the background concert has an impact on the brain,activates some brain regions,change the connection properties of functional brain network,and has a significant effect on the power spectral density of the ? waves and ? waves in the EEG signals,occupying cognitive resources of the brain and reducing spatial positioning recognition knowing ability interferes with working memory.