In this study, the changes in activation in terms of Oxy-Hemoglobin (HbO) and Deoxy-Hemoglobin (HbR) were detected in response to join attention based tasks in normal adults using near infrared spectroscopy and imaging. With these detections, functional connectivity between the left and right sides of frontal region of the brain was measured and modeled by a lagged covariance structural equation modeling (SEM). Statistical analysis was performed to assess the difference in the path coefficients amongst different stimuli (joint attention, non-joint attention, and baseline rest). The results demonstrate that the left and right sides of the frontal region of the brain interacted with each other distinctly in response to the joint and non-joint attention based stimuli.
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