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    Distinct Patterns of Temporally Coded Electrical Stimulation Interfere With Long-Range Interhemispheric Coupling in a Focal Model of Epilepsy


    Santos Xavier, Larissa Samara, Maia Montalvão, Thiago Moreira, de Oliveira Guarnieri, Leonardo, Carvalho-Moreira, João Pedro, Passos, Matheus Costa, Cota, Vinícius Rosa and Moraes, Márcio Flávio Dutra (2025) Distinct Patterns of Temporally Coded Electrical Stimulation Interfere With Long-Range Interhemispheric Coupling in a Focal Model of Epilepsy. Neuromodulation: Technology at the Neural Interface. ISSN 1094-7159

    Abstract

    Objectives This study investigated 1) epileptiform activity propagation triggered by intrahippocampal kainic acid (KA) injections, 2) whether low-frequency probing stimulation applied to the ipsilateral amygdaloid complex (AMY) would affect propagation, and 3) whether distinct temporal patterns of electrical stimulation applied to the contralateral amygdaloid complex interfere with the interhemispheric propagation pattern. Materials and Methods Electrical stimulation (ES) comprised a 100-μs pulse of 500 μA applied to the AMY. The Probing protocol applied a 2000-millisecond interpulse-interval (IPI) ES ipsilateral to KA injection. The Propagation protocol ES was applied contralateral to KA injection using temporally coded ES patterns: periodic stimulation (PS, with fixed 250-millisecond IPI or nonperiodic stimulation [NPS], power-law distributed IPIs constrained by a maximum of 4 pulses/s). Continuous local-field electrophysiologic data were recorded from AMY and hippocampus sites in both hemispheres. Results Our results show that probing stimulation to the ipsilateral amygdala does not interfere with the seizure propagation pattern; however, independent contralateral seizures were observed. Our data show that NPS treatment, but not PS, interferes with propagation to the contralateral hemisphere even when applied before KA injection: seizure duration, energy, and total number of seizures were significantly reduced. Seizure causality analysis between channels also shows significant differences between PS and NPS treatments. Conclusion These data corroborate that KA injection seizures, even during status epilepticus, are not restricted to injection foci. Our data show promising perspectives on designing a closed-loop solution using 0.5-Hz probing stimulation to predict seizures and temporally coded stimulation to modulate seizure propagation.
    Item Type: Article
    Keywords: Closed-loop; DBS—deep brain electrical stimulation; epilepsy; neuromodulation seizure; control seizure; prediction seizure propagation;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 20845
    Identification Number: 10.1016/j.neurom.2025.08.414
    Depositing User: Vinicius Cota
    Date Deposited: 18 Nov 2025 17:37
    Journal or Publication Title: Neuromodulation: Technology at the Neural Interface
    Publisher: Wiley
    Refereed: Yes
    Related URLs:
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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