Evaluation of Frontal and Visual Cortices on Mental Working Tasks Using Functional Near Infrared Spectroscopy

摘要

This paper investigated the hemodynamic responses over the frontal and visual cortices in order to find out the contributions of these two brain areas to workload memory activities during a graded load-related memorizing task that involves visual perception. Factorial ANOVA was performed on the mean values of oxyHemoglobin (oxy-Hb) and deoxyHemoglobin (deoxy-Hb) concentration changes from three subjects over visual and prefrontal cortices to observe the interaction of factors like channels, subjects and workload levels. Besides, the t-maps of these two brain areas pointed out the regions of interest (channels 1, 2, 3, 4, 5, 6, 7, 8,10,13 and 14) are shown to reflect the significance in workloads differentiation. The results of statistical analysis and t-map investigations successfully explored the capability of multichannel functional near infrared spectroscopy (fNIRS) to detect two neurophysiological workloads under investigation and distinguish their activation patterns over multiple cortical areas.