{Hw Vol. 9, No. 1, pp. 41-46 (2007)



Dimension Analysis of Autocorrelation NIRS Signal for Subtraction Task to BCI


I. Kurimoto, K. Murakami, S. Ooeda, Y. Tanaka, M. Nakagawa, H. Furumoto and S. Tachi


Computer interface is useful for nerve intractable disease patient. It is the most important that development of brain-computer interface(BCI) which is the direct communication of brain information and external world. Near-Infrared Spectroscopy (NIRS) for cerebral func-tion analysis was developed in recent years. In this paper, we will propose a Log dimension analysis of the autocorrelation from NIRS signal for slightly cerebral activation at calcula-tion tasks to BCI. As a result of Log transform of gradient from autocorrelation data, it found out that it is effective in separation of a task component, subtraction tasks of one digit and two digits on the interparietal sulcus. In this Result of dimension analysis for NIRS signal, we present that it can become a rate scale of slightly cerebral activation.


Key Words : Dimension analysis, Log transform, Autocorrelation, NIRS




{Hw : The Japan Society for Welfare Engineering