Poster B6, Sunday, March 25, 8:00-10:00 am, Exhibit Hall C
In Search of Mind Wandering: Dynamic Functional Connectivity during Rest and Task
Ekaterina Denkova1, Jason S. Nomi1, Shruti Gopal Vij1, Lucina Q. Uddin1, Amishi P. Jha1; 1University of Miami
Mind wandering (MW), defined as self-generated thinking disengaged from the external environment, has become a prominent topic in neuroscientific research. Emerging evidence suggests a critical role of three brain networks in MW: the default network (DN), the central executive network (CEN), and the salience network (SN). Advances in analytical methods for functional neuroimaging data (i.e., dynamic functional connectivity, DFC) demonstrate that the interactions among these networks are not static, but dynamically fluctuate over time. The majority of prior evidence comes from investigations focusing on the task-free resting state, which is often assumed to reflect unconstrained MW. Yet, it remains unclear if tasks characterized by fluctuations between attention and MW involve similar patterns of DFC. The present study applies the DFC method to neuroimaging data collected from 30 participants who completed a resting state scan followed by two sessions of a sustained attention to response task with embedded questions assessing MW. A DFC analysis revealed five dynamic network states common to both rest and task. Differences between rest and task appeared in the frequency of occurrence of two states. One state was more frequent during rest and characterized by weak connectivity between the three networks. The second state was more frequent during task and characterized by a negative correlation between the DN and CEN and SN, as well as a positive correlation between the CEN and SN. These findings suggest that some patterns of dynamic intercorrelations between networks may vary as a function of cognitive state.
Topic Area: ATTENTION: Other