Purpose: Mind wandering, i.e. mental time-travelling and imagery unrelated to the current situation has recently been related to mesial temporal lobe (memory) function. In this regard we evaluated as to whether parameters of mind wandering are related to material specific memory in patients with a left-, right-, or extra- temporal lobe epilepsy.
Methods: In this prospective controlled study we analyzed mind wandering, material specific memory, and executive functions in 29 right-handed patients with right-, left-, or extra-temporal lobe epilepsies. Mind wandering was assessed with a sustained attention to response task containing embedded inquiries on mind wandering. In addition, verbal list learning and memory (VLMT), design list learning (DCS-R), and executive function (EpiTrack) were assessed.
Results: In patients with right temporal lobe epilepsy, the propensity to mind wander was positively related to verbal memory performance, while in left temporal lobe epilepsy, the propensity and future related mind wandering were positively correlated to the performance in visual/figural memory. Generally, the propensity of MW was related to executive function as well.
Conclusion: The results suggest that mind wandering in lateralized temporal lobe epilepsy appears to be non-specifically driven by executive function and specifically by the mode and functionality of the memory system of the non-epileptic hemisphere. Repeated assessments would be required to discern as to how much such patterns depend on lesions versus epileptic dysfunction and whether they change with successful medical or surgical treatment.
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