Novelty Processing Depends on Medial Temporal Lobe Structures [article]

Judith Schomaker, Maud M.E. Grouls, Elias Rau, Marc Hendriks, Albert Colon, Martijn Meeter
2020 bioRxiv   pre-print
Objectives: The goal of the present study was to identify the role of the medial temporal lobe (MTL) in the detection and later processing of novelty stimuli. Methods: Twenty-one epilepsy patients with unilateral MTL resection (10 left-sided; 11 right-sided) performed an adapted visual novelty oddball task. In this task two streams of stimuli were presented on the left and right of fixation while the patients' electroencephalogram was measured. Patients responded to infrequent target stimuli,
more » ... t target stimuli, while ignoring frequent standard, and infrequent novel stimuli that could appear either contra- or ipsilateral to the resected side. Results: Novelty detection, as indexed by the N2 ERP component elicited by novels, was not affected by the MTL resections. Later processing of novels, however, as indexed by the novelty P3 ERP component, was reduced for novels presented contra- versus ipsilateral to the resected side. Target processing, as indexed by the P3b, was unaffected. Conclusions: The current results suggest that MTL structures play a role in novelty processing, but that the novelty signal may originate from a distinct neural source.
doi:10.1101/2020.11.10.374538 fatcat:uyirurm5fzh2bimk6gdmy7f2qq