Conduction delays as estimated by cortico-cortical evoked potentials. Marquis, R., Van Mierlo, P., Baud, M., Mégevand, P., Spinelli, L., & Vulliémoz, S. In Alpine Brain Imaging Meeting, Champéry, January, 2018. abstract bibtex Functional brain connectivity derived from electroencephalography (EEG) provides important insights into epilepsy and the localization of the seizure onset zone. However, functional connectivity metrics are highly influenced by assumptions on conduction delays. Current models of functional connectivity based on Granger causality do not take into account the variability of conduction delay across the human brain. In this study, we applied cortico-cortical evoked potentials (CCEP) to estimate effective functional connectivity and derive conduction delays for early (0 to 50 ms post-stimulus onset) and late (50 to 500 ms post-stimulus onset) evoked responses in 1 patient with depth electrodes. We extracted the latency at the peak of the response, at the rising phase and at the response onset. Early responses showed an average latency of 7.21 ± 4.14, 11.79 ± 5.42 and 22.73 ± 8.62 ms at the onset of the response, at the rising phase and at the peak respectively. Late responses showed an average latency of 54.98 ± 13.92, 86.37 ± 39.93 and 128.25 ± 55.62 ms at response onset, rising phase and peak respectively. The variability of these latencies suggests that conduction delays contain valuable information that might improve functional brain connectivity models.
@inproceedings{marquis2018abim,
address = {Champéry},
title = {Conduction delays as estimated by cortico-cortical evoked potentials},
abstract = {Functional brain connectivity derived from electroencephalography (EEG) provides important insights into epilepsy and the localization of the seizure onset zone. However, functional connectivity metrics are highly influenced by assumptions on conduction delays. Current models of functional connectivity based on Granger causality do not take into account the variability of conduction delay across the human brain. In this study, we applied cortico-cortical evoked potentials (CCEP) to estimate effective functional connectivity and derive conduction delays for early (0 to 50 ms post-stimulus onset) and late (50 to 500 ms post-stimulus onset) evoked responses in 1 patient with depth electrodes. We extracted the latency at the peak of the response, at the rising phase and at the response onset. Early responses showed an average latency of 7.21 ± 4.14, 11.79 ± 5.42 and 22.73 ± 8.62 ms at the onset of the response, at the rising phase and at the peak respectively. Late responses showed an average latency of 54.98 ± 13.92, 86.37 ± 39.93 and 128.25 ± 55.62 ms at response onset, rising phase and peak respectively. The variability of these latencies suggests that conduction delays contain valuable information that might improve functional brain connectivity models.},
booktitle = {Alpine {Brain} {Imaging} {Meeting}},
author = {Marquis, Renaud and Van Mierlo, Pieter and Baud, Maxime and Mégevand, Pierre and Spinelli, Laurent and Vulliémoz, Serge},
month = jan,
year = {2018}
}
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