According to the textbook, _____ hypothesis claims that the activities of the DMN show spontaneous periodic fluctuations at a slow rate. The DMN activity is suppressed when the executive network is active but it might exceed a certain threshold at some points, and then mind wandering occurs. According to the textbook, _____ hypothesis claims that the activities of the DMN show spontaneous periodic fluctuations at a slow rate. The DMN activity is suppressed when the executive network is active but it might exceed a certain threshold at some points, and then mind wandering occurs. resource executive failure default-mode interference James-Lange