Comput Math Methods Med - Measuring connectivity in linear multivariate processes: definitions, interpretation, and practical analysis.

Tópicos

{ framework(1458) process(801) describ(734) }
{ measur(2081) correl(1212) valu(896) }
{ network(2748) neural(1063) input(814) }
{ estim(2440) model(1874) function(577) }
{ visual(1396) interact(850) tool(830) }
{ result(1111) use(1088) new(759) }
{ clinic(1479) use(1117) guidelin(835) }
{ research(1085) discuss(1038) issu(1018) }
{ structur(1116) can(940) graph(676) }
{ signal(2180) analysi(812) frequenc(800) }
{ data(1737) use(1416) pattern(1282) }
{ design(1359) user(1324) use(1319) }
{ model(2220) cell(1177) simul(1124) }
{ general(901) number(790) one(736) }
{ studi(1119) effect(1106) posit(819) }
{ model(3480) simul(1196) paramet(876) }
{ state(1844) use(1261) util(961) }
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{ age(1611) year(1155) adult(843) }
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{ cost(1906) reduc(1198) effect(832) }
{ group(2977) signific(1463) compar(1072) }
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Resumo

This tutorial paper introduces a common framework for the evaluation of widely used frequency-domain measures of coupling (coherence, partial coherence) and causality (directed coherence, partial directed coherence) from the parametric representation of linear multivariate (MV) processes. After providing a comprehensive time-domain definition of the various forms of connectivity observed in MV processes, we particularize them to MV autoregressive (MVAR) processes and derive the corresponding frequency-domain measures. Then, we discuss the theoretical interpretation of these MVAR-based connectivity measures, showing that each of them reflects a specific time-domain connectivity definition and how this results in the description of peculiar aspects of the information transfer in MV processes. Furthermore, issues related to the practical utilization of these measures on real-time series are pointed out, including MVAR model estimation and significance assessment. Finally, limitations and pitfalls arising from model mis-specification are discussed, indicating possible solutions and providing practical recommendations for a safe computation of the connectivity measures. An example of estimation of the presented measures from multiple EEG signals recorded during a combined visuomotor task is also reported, showing how evaluation of coupling and causality in the frequency domain may help describing specific neurophysiological mechanisms.

Resumo Limpo

tutori paper introduc common framework evalu wide use frequencydomain measur coupl coher partial coher causal direct coher partial direct coher parametr represent linear multivari mv process provid comprehens timedomain definit various form connect observ mv process particular mv autoregress mvar process deriv correspond frequencydomain measur discuss theoret interpret mvarbas connect measur show reflect specif timedomain connect definit result descript peculiar aspect inform transfer mv process furthermor issu relat practic util measur realtim seri point includ mvar model estim signific assess final limit pitfal aris model misspecif discuss indic possibl solut provid practic recommend safe comput connect measur exampl estim present measur multipl eeg signal record combin visuomotor task also report show evalu coupl causal frequenc domain may help describ specif neurophysiolog mechan

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