Subject-to-subject adaptation to reduce calibration time in motor imagery-based brain-computer interface

In order to enhance the usability of a motor imagery-based brain-computer interface (BCI), it is highly desirable to reduce the calibration time. Due to inter-subject variability, typically a new subject has to undergo a 20-30 minutes calibration session to collect sufficient data for training a BCI model based on his/her brain patterns. This paper proposes a new subject-to-subject adaptation algorithm to reliably reduce the calibration time of a new subject to only 3-4 minutes. To reduce the calibration time, unlike several past studies, the proposed algorithm does not require a large pool of historic sessions. In the proposed algorithm, using only a few trials from the new subject, first, the new subject's data is adapted to each available historic session separately. This is done by a linear transformation minimizing the distribution difference between the two groups of EEG data. Thereafter, among the available historic sessions, the one matched the most to the new subject's adapted data is selected as the calibration session. Consequently, the previously trained model based on the selected historic session is entirely used for the classification of the new subject's data after adaptation. The proposed algorithm is evaluated on a publicly available dataset with 9 subjects. For each subject, the calibration session is selected only from the calibration sessions of the eight other subjects. The experimental results showed that our proposed algorithm not only reduced the calibration time by 85%, but also performed on average only 1.7% less accurate than the subject-dependent calibration results

Study of the 93-Nb + 7-Li Reactions with Application to Double Charge Exchange and Possible Production of New Neutron-Rich Nuclei

Supported by the National Science Foundation and Indiana Universit

Search for Rare Natural Decay Modes from 228-Th

This research was sponsored by the National Science Foundation Grant NSF PHy 87-1440

Radioactive Decay Studies of Nuclei Produced from Bombardment by Intermediate Energy Neutrons

This work was supported by National Science Foundation Grants PHY 76-84033A01, PHY 78-22774, and Indiana Universit

Measurement of the 1/E Dependence of the 7-Li(p,n)7-Be Total Reaction Cross Section

This work was supported by the National Science Foundation Grant NSF PHY 78-22774 A02 & A03 and by Indiana Universit

Search for Fission-Like Processes in the 200 MeV p+ 28-Si Reaction

This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana Universit

Spectroscopic Applications of the (p,pi-) Reaction

This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

Radioactive Decay Studies of Nuclei Produced from Bombardment by Intermediate-Energy Neutrons

This work was supported by National Science Foundation Grant PHY 76-84033 and Indiana Universit

Measurement of the Total (p,Pi) Cross Sections Through Residual Activity

This work was supported by National Science Foundation Grant PHY 75-00289 and Indiana Universit