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dc.creatorStokić, Miodrag
dc.creatorMilovanović, Dragan
dc.creatorLjubisavljević, Milos R.
dc.creatorNenadović, Vanja
dc.creatorCukić, Milena
dc.date.accessioned2021-02-18T10:44:23Z
dc.date.available2021-02-18T10:44:23Z
dc.date.issued2015
dc.identifier.issn0014-4819
dc.identifier.urihttp://intor.torlakinstitut.com/handle/123456789/428
dc.description.abstractThe objective of this preliminary study was to quantify changes in complexity of EEG using fractal dimension (FD) alongside linear methods of spectral power, event-related spectral perturbations, coherence, and source localization of EEG generators for theta (4-7 Hz), alpha (8-12 Hz), and beta (13-23 Hz) frequency bands due to a memory load effect in an auditory-verbal short-term memory (AVSTM) task for words. We examined 20 healthy individuals using the Sternberg's paradigm with increasing memory load (three, five, and seven words). The stimuli were four-letter words. Artifact-free 5-s EEG segments during retention period were analyzed. The most significant finding was the increase in FD with the increase in memory load in temporal regions T3 and T4, and in parietal region Pz, while decrease in FD with increase in memory load was registered in frontal midline region Fz. Results point to increase in frontal midline (Fz) theta spectral power, decrease in alpha spectral power in parietal region-Pz, and increase in beta spectral power in T3 and T4 region with increase in memory load. Decrease in theta coherence within right hemisphere due to memory load was obtained. Alpha coherence increased in posterior regions with anterior decrease. Beta coherence increased in fronto-temporal regions. Source localization delineated theta activity increase in frontal midline region, alpha decrease in superior parietal region, and beta increase in superior temporal gyrus with increase in memory load. In conclusion, FD as a nonlinear measure may serve as a sensitive index for quantifying dynamical changes in EEG signals during AVSTM tasks.en
dc.publisherSpringer, New York
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/178027/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/43011/RS//
dc.rightsrestrictedAccess
dc.sourceExperimental Brain Research
dc.subjectElectroencephalogramen
dc.subjectShort-term memoryen
dc.subjectWordsen
dc.subjectFractal dimensionen
dc.subjectCoherenceen
dc.subjectSpectral poweren
dc.subjectERSPsen
dc.subjectsLORETAen
dc.titleMemory load effect in auditory-verbal short-term memory task: EEG fractal and spectral analysisen
dc.typearticle
dc.rights.licenseARR
dc.citation.epage3038
dc.citation.issue10
dc.citation.other233(10): 3023-3038
dc.citation.rankM23
dc.citation.spage3023
dc.citation.volume233
dc.identifier.doi10.1007/s00221-015-4372-z
dc.identifier.pmid26169106
dc.identifier.rcubconv_368
dc.identifier.scopus2-s2.0-84942342575
dc.identifier.wos000361635800024
dc.type.versionpublishedVersion


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