In order to more effectively apply an artifact removal melhod in an online brain-computer interface （BCI） system, a new method based on canonical correlation analysis （CCA） and two-channel eleetroeneephalography ...In order to more effectively apply an artifact removal melhod in an online brain-computer interface （BCI） system, a new method based on canonical correlation analysis （CCA） and two-channel eleetroeneephalography （EEG） recordings to quickly remove ocular artifacts （OA） is proposed in this paper. Considering both the formation of EEG signals contaminated by OA and the spread of OA, vertical electrooculo~＇aphy （VEOG） was appropriately introduced in CCA, and the blind source separation （BSS~ method based on CCA was used in a new way during the OA removal process. Both experimental and comparison with ICA and SOBI results show that the new method with simple calculation and fast processing speed can effectively separate and remove OA using only two-channel EEG recordings, with retaining useful EEG signals. Hence, this method used in an online BCI system will be more effective.展开更多
After 300 - 500 ms of various movements, a significant rebound in beta rhythm power is observed. This phenomenon is called Post-Movement Beta Rebound (PMBR). Previous studies have been carried out in a single movement...After 300 - 500 ms of various movements, a significant rebound in beta rhythm power is observed. This phenomenon is called Post-Movement Beta Rebound (PMBR). Previous studies have been carried out in a single movement context in the exploration of its functional significance, and few studies have been conducted in connected movements. Therefore, this study used the cue-induced delayed task paradigm to examine the PMBR change in the motor cortex of the 20 adults when they were moving under the single or connected movements condition. It was found on right-hand movements that the PMBR of the first movement in a connected condition was stronger than that of a single movement, and it was also observed on both left- and right-hand movements that the PMBR of the first movement was stronger than that of the last movement in a connected condition. The results show that the PMBR after the connected movement was stronger than the no movement connection, reflecting that PMBR plays an important role in the preparation of subsequent movements.展开更多
基金National Science Foundation of China grant number: 61172108,61139001 and 60872122+1 种基金Shanghai Dianji University Leading Academic Discipine Project grant number: 10xkf01
文摘In order to more effectively apply an artifact removal melhod in an online brain-computer interface （BCI） system, a new method based on canonical correlation analysis （CCA） and two-channel eleetroeneephalography （EEG） recordings to quickly remove ocular artifacts （OA） is proposed in this paper. Considering both the formation of EEG signals contaminated by OA and the spread of OA, vertical electrooculo~＇aphy （VEOG） was appropriately introduced in CCA, and the blind source separation （BSS~ method based on CCA was used in a new way during the OA removal process. Both experimental and comparison with ICA and SOBI results show that the new method with simple calculation and fast processing speed can effectively separate and remove OA using only two-channel EEG recordings, with retaining useful EEG signals. Hence, this method used in an online BCI system will be more effective.
文摘After 300 - 500 ms of various movements, a significant rebound in beta rhythm power is observed. This phenomenon is called Post-Movement Beta Rebound (PMBR). Previous studies have been carried out in a single movement context in the exploration of its functional significance, and few studies have been conducted in connected movements. Therefore, this study used the cue-induced delayed task paradigm to examine the PMBR change in the motor cortex of the 20 adults when they were moving under the single or connected movements condition. It was found on right-hand movements that the PMBR of the first movement in a connected condition was stronger than that of a single movement, and it was also observed on both left- and right-hand movements that the PMBR of the first movement was stronger than that of the last movement in a connected condition. The results show that the PMBR after the connected movement was stronger than the no movement connection, reflecting that PMBR plays an important role in the preparation of subsequent movements.
