{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,18]],"date-time":"2026-04-18T03:56:01Z","timestamp":1776484561335,"version":"3.51.2"},"update-to":[{"DOI":"10.1371\/journal.pcbi.1010985","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2023,4,5]],"date-time":"2023-04-05T00:00:00Z","timestamp":1680652800000}}],"reference-count":55,"publisher":"Public Library of Science (PLoS)","issue":"3","license":[{"start":{"date-parts":[[2023,3,24]],"date-time":"2023-03-24T00:00:00Z","timestamp":1679616000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000266","name":"Engineering and Physical Sciences Research Council","doi-asserted-by":"publisher","award":["2407565"],"award-info":[{"award-number":["2407565"]}],"id":[{"id":"10.13039\/501100000266","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100019418","name":"NIHR Maudsley Biomedical Research Centre","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100019418","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100022431","name":"Medical Research Council Centre for Neurodevelopmental Disorders","doi-asserted-by":"publisher","award":["MR\/N026063\/1"],"award-info":[{"award-number":["MR\/N026063\/1"]}],"id":[{"id":"10.13039\/501100022431","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100018694","name":"HORIZON EUROPE Marie Sklodowska-Curie Actions","doi-asserted-by":"publisher","award":["750884"],"award-info":[{"award-number":["750884"]}],"id":[{"id":"10.13039\/100018694","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.ploscompbiol.org"],"crossmark-restriction":false},"short-container-title":["PLoS Comput Biol"],"abstract":"<jats:p>Neural mass models (NMMs) are important for helping us interpret observations of brain dynamics. They provide a means to understand data in terms of mechanisms such as synaptic interactions between excitatory and inhibitory neuronal populations. To interpret data using NMMs we need to quantitatively compare the output of NMMs with data, and thereby find parameter values for which the model can produce the observed dynamics. Mapping dynamics to NMM parameter values in this way has the potential to improve our understanding of the brain in health and disease.<\/jats:p>\n<jats:p>Though abstract, NMMs still comprise of many parameters that are difficult to constrain <jats:italic>a priori<\/jats:italic>. This makes it challenging to explore the dynamics of NMMs and elucidate regions of parameter space in which their dynamics best approximate data. Existing approaches to overcome this challenge use a combination of linearising models, constraining the values they can take and exploring restricted subspaces by fixing the values of many parameters <jats:italic>a priori<\/jats:italic>. As such, we have little knowledge of the extent to which different regions of parameter space of NMMs can yield dynamics that approximate data, how nonlinearities in models can affect parameter mapping or how best to quantify similarities between model output and data. These issues need to be addressed in order to fully understand the potential and limitations of NMMs, and to aid the development of new models of brain dynamics in the future.<\/jats:p>\n<jats:p>To begin to overcome these issues, we present a global nonlinear approach to recovering parameters of NMMs from data. We use global optimisation to explore all parameters of nonlinear NMMs simultaneously, in a minimally constrained way. We do this using multi-objective optimisation (multi-objective evolutionary algorithm, MOEA) so that multiple data features can be quantified. In particular, we use the weighted horizontal visibility graph (wHVG), which is a flexible framework for quantifying different aspects of time series, by converting them into networks.<\/jats:p>\n<jats:p>We study EEG alpha activity recorded during the eyes closed resting state from 20 healthy individuals and demonstrate that the MOEA performs favourably compared to single objective approaches. The addition of the wHVG objective allows us to better constrain the model output, which leads to the recovered parameter values being restricted to smaller regions of parameter space, thus improving the practical identifiability of the model. We then use the MOEA to study differences in the alpha rhythm observed in EEG recorded from 20 people with epilepsy. We find that a small number of parameters can explain this difference and that, counterintuitively, the mean excitatory synaptic gain parameter is reduced in people with epilepsy compared to control. In addition, we propose that the MOEA could be used to mine for the presence of pathological rhythms, and demonstrate the application of this to epileptiform spike-wave discharges.<\/jats:p>","DOI":"10.1371\/journal.pcbi.1010985","type":"journal-article","created":{"date-parts":[[2023,3,24]],"date-time":"2023-03-24T17:46:57Z","timestamp":1679680017000},"page":"e1010985","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":10,"title":["Global nonlinear approach for mapping parameters of neural mass models"],"prefix":"10.1371","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1973-1404","authenticated-orcid":true,"given":"Dominic M.","family":"Dunstan","sequence":"first","affiliation":[]},{"given":"Mark P.","family":"Richardson","sequence":"additional","affiliation":[]},{"given":"Eugenio","family":"Abela","sequence":"additional","affiliation":[]},{"given":"Ozgur E.","family":"Akman","sequence":"additional","affiliation":[]},{"given":"Marc","family":"Goodfellow","sequence":"additional","affiliation":[]}],"member":"340","published-online":{"date-parts":[[2023,3,24]]},"reference":[{"issue":"8","key":"pcbi.1010985.ref001","doi-asserted-by":"crossref","first-page":"e1000092","DOI":"10.1371\/journal.pcbi.1000092","article-title":"The Dynamic Brain: From Spiking Neurons to Neural Masses and Cortical Fields","volume":"4","author":"G Deco","year":"2008","journal-title":"PLoS Comput. 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