Evaluation of fNIRS signal components elicited by cognitive and hypercapnic stimuli.

ABSTRACT: Functional near infrared spectroscopy (fNIRS) measurements are confounded by signal components originating from multiple physiological causes, whose activities may vary temporally and spatially (across tissue layers, and regions of the cortex). Furthermore, the stimuli can induce evoked effects, which may lead to over or underestimation of the actual effect of interest. Here, we conducted a temporal, spectral, and spatial analysis of fNIRS signals collected during cognitive and hypercapnic stimuli to characterize effects of functional versus systemic responses. We utilized wavelet analysis to discriminate physiological causes and employed long and short source-detector separation (SDS) channels to differentiate tissue layers. Multi-channel measures were analyzed further to distinguish hemi

SUBMITTER: Reddy P 

PROVIDER: S-EPMC8648757 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature