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Objectives: This study aimed to investigate whether different types of memory stimulus provide different information during the Wada or intracarotid amytal procedure (IAP) in patients with refractory medial temporal lobe epilepsy (MTLE). Methods: Eighty nine surgical candidates with documented MTLE and selected for left hemispheric language dominance underwent memory assessment with verbal and dually encodable stimuli during a presurgical IAP. Results: The overall IAP memory performance with the left hemisphere is significantly better than with the rig ht hemisphere regardless of lesion side. This can be explained by the left hemis pheric advantage of encoding all stimuli, whereas the right hemisphere has only limited resources to encode verbal stimuli. More importantly, it appeared that dually encodable items remain more readily recognised following injection ipsilateral to the lesion, whereas verbal items are always better recognised following right hemisphere injection regardless of lesion side. Conclusions: Verbal IAP stimuli show left hemispheric sensitivity in left language dominant MTLE patients. The dually encodable items of the IAP appear lesion sensitive.
Objectives: This study aimed to investigate either different types of memory stimulus provide different information during the Wada or intracarotid amytal procedure (IAP) in patients with refractory medial temporal lobe epilepsy (MTLE). Methods: Eighty nine surgical candidates with documented MTLE and selected for Left hemispheric language dominance underwent memory assessment with verbal and dually encodable stimuli during a presurgical IAP. Results: The overall IAP memory performance with the left hemisphere is significantly better than with the rig ht hemisphere regardless of lesion side. This can be explained by the left hemis pheric advantage of encoding all stimuli, but the right hemisphere has only limited resources to encode verbal stimuli. more importantly, it that dually encodable items remain more well recognized under injection ipsilateral to the lesion, but verbal items are always better recognized following right hemisphere injection regardless of lesion side. Conclusions: Verbal IAP stimuli show left hemispheric sensitivity in left language dominant MTLE patients. The dually encodable items of the IAP appear lesion sensitive.