Activation/deactivation maps of the verbal fluency character task. a, activation/deactivation map of HC; b, group comparison between HC and TLE-HS; c, group comparison between HC and TLE-NHS. Clusters are shown under the threshold: p < 0.001, k ≥ 10. HC, healthy controls; TLE-HS, patients with temporal lobe epilepsy and hippocampal sclerosis; TLE-NHS, patients with temporal lobe epilepsy and without hippocampal sclerosis.