Simultaneous measurement under resting-state of autonomic nervous activity and brain activity by near-infrared spectroscopy alone

• We were able to evaluate autonomic nervous activity using near-infrared spectroscopy. Heartbeat-related signals extracted from the signal-processed total hemoglobin data correlated well with R-R intervals. Heart-rate variability parameters had a high correlation between spectroscopy and electrocardiogram.. Near-infrared (NIRS) is widely used for brain-function imaging, but raw signal also encompasses various other physiological factors such as heartbeat. In this study, we aimed extract heartbeat-related NIRS brain simultaneously. For that purpose, simultaneous electrocardiogram (ECG) datasets acquired 10 healthy volunteers, heart-rate intervals obtained each dataset compared. investigated which could affect extrication of data, number channels, type signal, resampling interval data. found be effectively by averaging all channels (52 channels) after band-pass filtering upsampling same 4 msec (250 Hz) ECG sampling interval, showed indicators calculated those Despite its simplicity, our method demonstrates possibility analyzing while considering only.