;In our daily lives, working memory (WM) has played a very important role during working or learning. So many studies have focused on WM capability assessment and training of WM. For now, researchers generally use the intelligence tests to assess the WM capacity. But, can the behavioral data (Intelligence tests etc.) completely assess the neurophysiological change? Does the working memory training really change our brains? To answer the questions, we first correlated the performance of the N-back task to its ERPs (P300 and N200) to find their relation and then the amplitude and latency of N200 to assess the effectiveness of working memory training. In addition, DCM was employed to explore the mechanisms underlying the n-back task before and after WM training.
This study recruited thirty Central University student subjects with normal vision and no history of central nervous system disorders, and they are right handedness. Training group, control group (1) and control group (2) respectively have 10 persons. Subjects in the training group were asked to perform spatial span in three weeks, five days a week and thirty minutes a day. Subjects in the control group (1) need to complete motion control game, it is independent of memory, with the experimental group trained the same frequency. While the control group (2) does not require any training accepted. And then by the three documents as the basis, we have established three different models, to find the most suitable for the study of the neural network structure. Finally, the best structure to find out which areas of the network connection appears significant change before and after the training.
There is no significant relation between ERPs and the performance of the n-back task. Memory training of web puzzle game, we find three electrode sites (C4, T8, P8) appear the value of N2 amplitudes increased in the experimental group are significantly higher than control group, This shows that memory training has its positive effects, it can indeed reduce the impact of memory load on the brain, and its effects can be maintained for at least a week. The fish sticks hastily trained cannot produce a significant impact on the working memory.
Memory training not only makes the connection strength to get a significant increase in some brain regions , for example LIPS connects SFG and SFG connects RMFG in forward, RIPS connects RV1 in backward, LIPS connects RIPS in lateral, also inhibits some we do not need to use the brain area connection, such as RMFG connection SFG.