Reduced past-oriented mind wandering in left compared to right medial temporal lobe epilepsy

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• Mind wandering involves attention shifting from tasks to unrelated thoughts.
• The left medial temporal lobe (MTL) shows increased activation during mind wandering, suggesting a key role.
• The MTL's connection to memory suggests it might be crucial for past-oriented mind wandering.

Purpose of the Study:

• To investigate the role of the medial temporal lobe (MTL) in mind wandering, particularly towards the past.
• To examine if left MTL epilepsy affects the propensity and temporal orientation of mind wandering.

Main Methods:

• Studied 89 epilepsy patients using a sustained attention task with experience sampling probes.
• Assessed mind wandering occurrence, meta-awareness, and temporal orientation (past, present, future).
• Compared mind wandering patterns across different epilepsy subgroups (left MTL, right MTL, idiopathic, extratemporal) and syncopes.

Main Results:

• No significant difference in the overall propensity to mind wander was found between patient subgroups.
• Patients with left MTL epilepsy exhibited significantly less past-oriented mind wandering compared to right MTL epilepsy patients.
• A trend towards diminished past-oriented mind wandering was observed in left MTL epilepsy patients compared to idiopathic epilepsy patients.
• Right MTL epilepsy patients showed increased past-oriented mind wandering compared to extratemporal epilepsy patients and those with syncopes.

Conclusions:

• The total amount of mind wandering does not critically depend on the left MTL.
• The left MTL plays a specific role in facilitating mind wandering directed towards the past.
• Altered past-oriented mind wandering in MTL epilepsy suggests functional lateralization within the MTL for temporal aspects of cognition.