基于EEG脑网络的视觉呈现速度对工作记忆影响的研究

doi:10.3969/j.issn.0258-8021.2023.03.001

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Abstract With the quickening pace of life, multiple playbacks have been widely used in learning process, and the impacts on the learning cognitive activities have gradually attracted attentions of researches. In order to explore the effect of visual presentation speed of memory tasks on working memory and its mechanism, this paper studied from the view of EEG brain network. An experimental paradigm was designed under the two presentation speeds of fast and slow. EEG data of 18 subjects were collected, power spectrum of each frequency band was calculated, and the frequency band with significant difference (P<0.05) was selected for analysis. The Granger causality method was used to calculate the causal relationship between brain regions in different frequency bands, and a weighted causal brain network was constructed. The three network characteristics of the network, namely, the degree of entry, the degree of exit, and the clustering coefficient, were analyzed. Support vector machines were used to classify the brain networks in the fast and slow state. The results showed that in the fast visual presentation state, the access of the brain network increased, and the node clustering coefficient was further strengthened, and the nodes with significant differences were mainly distributed in the frontal lobe, parietal lobe and occipital lobe, which were significantly higher than those in the slow visual presentation state (P<0.05). The classification accuracy of the brain network in the fast and slow state was up to 90.96%, 90.29% and 86.53% respectively by taking the access, exit and clustering coefficient of each frequency band as characteristics. This study showed that with the acceleration of visual presentation and the further activation of visual processing, the subjects' working memory awareness activities were gradually enhanced, and the leading role of the left hemisphere of the brain in cognitive activities such as language and reasoning were also continuously strengthened. In conclusion, this paper investigated the directed brain network in two states, fast and slow, which provided a new insight for exploring the impact of playback speed on learning cognitive activities, as well as a theoretical basis for learning video designers to set playback speed.

Key words： EEG working memory visual stimulation Granger causality brain network

Received: 23 May 2022

PACS:

R318

Corresponding Authors: ^* E-mail: huangly@njupt.edu.cn

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	Wang Bixiao
	Chen Yao
	Li Xin
	Wang Shenglin
	Huang Liya

Cite this article:

Wang Bixiao,Chen Yao,Li Xin, et al. Research on the Effect of Visual Presentation Speed on Working Memory Based on EEG Brain Network[J]. Chinese Journal of Biomedical Engineering, 2023, 42(3): 257-265.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2023.03.001 OR http://cjbme.csbme.org/EN/Y2023/V42/I3/257

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