Research On ERPs And Brain Network Based On Visual Spatial Cognitive Linking Memory

Project memory is the memory of the project itself,and associative memory is the memory of the relationship between the projects,also known as relational memory.Visual spatial associative memory is the memory of the relationship between the size,color and shape(object information)of an object and its spatial position.Previous studies mainly focused on spatial memory,and were mainly limited to psychological cognitive behavior and isolated brain activity,while there were few studies on brain networks of high-level cognitive functional states such as visuospatial associative memory.Therefore,based on the classical paradigm of change detection of visual spatial cognition,this paper uses event-related potentials(ERPs)technology and complex network analysis method to analyze the topological attribute parameters and ERPs components of brain network,and discusses the brain region synergy and brain lateralization of visual spatial connection memory.Twenty eight college students were selected to complete the task of spatial location memory(item memory),object shape spatial location correspondence memory(associative memory)and half field tachycardia.Behavioral data and 64 channel EEG EEG data were recorded synchronously.ERPs were extracted by average superposition technique to synchronize the beta rhythm and high gamma rhythm of EEG However,the topological graph of brain functional network was analyzed and constructed.The global and node attribute parameters and ERPs components of brain network were statistically analyzed.The brain functional characteristics of associative memory task and item memory task were compared and analyzed.Whether there was lateralization of left and right brain function under associative memory task was analyzed(1)Compared with item memory,the amplitudes of N1 component and P2 component in occipital lobe and frontal lobe induced by associative memory were significantly increased,which indicated that visuospatial associative memory was closely related to occipital and frontal lobe functions.(2)The results of brain functional network analysis showed that the node degree of frontal,parietal and occipital lobes was significantly higher than that of temporal lobes under item memory task,which indicated that the main brain regions involved in item memory were occipital parietal frontal(dorsal pathway);while there was no difference in the node degree of frontal,parietal,temporal and occipital lobes under associative memory task,which were all highly activated,and the node degree of frontal and temporal lobes under associative memory task was higher The results showed that the task of associative memory was performed by the occipital parietal frontal(dorsal)and occipital temporal frontal(ventral)pathways,especially related to the function of frontal and temporal lobes.Compared with item memory task,the clustering coefficient and global efficiency of brain network of associative memory task increased significantly,while the length of feature path decreased significantly,which indicated that the brain network of associative memory task was closely connected and the information transmission efficiency was higher.(3)The results showed that the ERPs waveforms of left and right visual field were different.The amplitudes of N1 component and P2 component induced by left visual field stimulation in occipital lobe and frontal lobe were larger than those of right visual field stimulation.During the half field tachycardia task,the left visual field stimulation mainly activated the right brain area,while the right visual field stimulation mainly activated the left brain area.The results showed that the activation of the right brain area under the left visual field stimulation was higher than that of the left brain area under the right visual field stimulation,suggesting that there was brain function lateralization under the task of associative memory,that is,the function of the right brain area was stronger than that of the left brain area.(4)The results of brain functional network analysis under the left and right visual field associative memory task showed that there were differences between the node attributes and the overall attributes under beta rhythm and high gamma rhythm under the left visual field stimulation and the right visual field stimulation,and the node degrees of temporal lobe,parietal lobe and occipital lobe under the left visual field stimulation were greater than those under the right visual field stimulation,which indicated the synchronization and synchronization of temporal lobe,parietal lobe and occipital lobe under the left visual field stimulation Enhanced functional connectivity.The clustering coefficient and global efficiency of brain network were significantly enhanced,and the length of characteristic path was significantly reduced under left visual field stimulation,which indicated that the brain network was closely connected,the transmission of information in brain functional network was accelerated,and the information transmission efficiency of brain network was improved under left visual field stimulation.It is suggested that there is lateralization of brain function in the task of associative memory,that is to say,the right brain area has advantages in the task of associative memory.The above results show that object shape spatial position correspondence memory(associative memory)is jointly participated by ventral(occipital temporal frontal)and dorsal(occipital parietal frontal)pathways.Compared with item memory,associative memory is closely connected in the brain network,and the information transmission is faster and more efficient in its brain functional network.There is lateralization of brain function in visuospatial associative memory,and the right brain area has dominance effect.