Purpose Functional magnetic resonance imaging (fMRI) has previously demonstrated functional reorganisation of memory representations in people with Temporal Lobe Epilepsy (TLE). Less is known about the changes in functional connectivity within the memory network.
Methods We studied 77 patients with unilateral TLE (37 left) and 27 controls. All participants performed a memory encoding fMRI paradigm of faces and words. Psychophysiological Interaction (PPI) analysis was conducted to examine brain regions that were time-correlated with activations in the left and right hippocampi.
Results During word encoding, left TLE patients showed reduced connectivity from the left hippocampus to the prefrontal cortex, compared to controls. During face encoding, right TLE patients showed reduced connectivity from the right hippocampus to the ipsilateral lateral temporal lobe and bilateral fusiform gyri. However, left and right TLE patients showed greater connectivity to posterior hippocampi bilaterally during word and face encoding.
Conclusion TLE is increasingly recognised as a network disease and correspondingly we demonstrate widespread memory network reorganisation in people with epilepsy. The reorganisation of eloquent functions has important implications in the planning of epilepsy surgery and a network approach may be helpful in the prediction of memory outcome after epilepsy surgery.
Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.