Physiological noise in near-infrared spectroscopy: implications for optical brain computer interfacing

S Coyle; T Ward; C Markham

doi:10.1109/IEMBS.2004.1404260

Physiological noise in near-infrared spectroscopy: implications for optical brain computer interfacing

Conf Proc IEEE Eng Med Biol Soc. 2004:2004:4540-3. doi: 10.1109/IEMBS.2004.1404260.

Authors

S Coyle¹, T Ward, C Markham

Affiliation

¹ Department of Electronic Engineering, National University of Ireland, Maynooth, Ireland.

PMID: 17271316
DOI: 10.1109/IEMBS.2004.1404260

Abstract

Near-infrared spectroscopy is a non-invasive optical method used to detect functional activation of the cerebral cortex. Cognitive, visual, auditory and motor tasks are among the functions that have been investigated by this technique in the context of optical brain computer interfacing. In order to determine whether the optical response is due to a stimulus, it is essential to identify and reduce the effects of physiological noise. This paper characterizes noise typically present in optical responses and reports signal processing approaches used to overcome such noise.