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Potential of on-scalp MEG

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Iivanainen, Joonas
dc.contributor.author Zetter, Rasmus
dc.contributor.author Parkkonen, Lauri
dc.date.accessioned 2019-11-07T12:07:49Z
dc.date.available 2019-11-07T12:07:49Z
dc.date.issued 2019-10-01
dc.identifier.citation Iivanainen , J , Zetter , R & Parkkonen , L 2019 , ' Potential of on-scalp MEG : Robust detection of human visual gamma-band responses ' , Human Brain Mapping . https://doi.org/10.1002/hbm.24795 en
dc.identifier.issn 1065-9471
dc.identifier.issn 1097-0193
dc.identifier.other PURE UUID: bb8388c1-65ba-4bf2-b98f-883c0b20c945
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/bb8388c1-65ba-4bf2-b98f-883c0b20c945
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/37920975/Iivanainen_et_al_2019_Human_Brain_Mapping.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/41152
dc.description | openaire: EC/H2020/678578/EU//HRMEG
dc.description.abstract Electrophysiological signals recorded intracranially show rich frequency content spanning from near-DC to hundreds of hertz. Noninvasive electromagnetic signals measured with electroencephalography (EEG) or magnetoencephalography (MEG) typically contain less signal power in high frequencies than invasive recordings. Particularly, noninvasive detection of gamma-band activity (>30 Hz) is challenging since coherently active source areas are small at such frequencies and the available imaging methods have limited spatial resolution. Compared to EEG and conventional SQUID-based MEG, on-scalp MEG should provide substantially improved spatial resolution, making it an attractive method for detecting gamma-band activity. Using an on-scalp array comprised of eight optically pumped magnetometers (OPMs) and a conventional whole-head SQUID array, we measured responses to a dynamic visual stimulus known to elicit strong gamma-band responses. OPMs had substantially higher signal power than SQUIDs, and had a slightly larger relative gamma-power increase over the baseline. With only eight OPMs, we could obtain gamma-activity source estimates comparable to those of SQUIDs at the group level. Our results show the feasibility of OPMs to measure gamma-band activity. To further facilitate the noninvasive detection of gamma-band activity, the on-scalp OPM arrays should be optimized with respect to sensor noise, the number of sensors and intersensor spacing. en
dc.format.extent 12
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Wiley
dc.relation info:eu-repo/grantAgreement/EC/H2020/678578/EU//HRMEG
dc.relation.ispartofseries Human Brain Mapping en
dc.rights openAccess en
dc.title Potential of on-scalp MEG en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Neuroscience and Biomedical Engineering
dc.subject.keyword gamma band
dc.subject.keyword magnetoencephalography
dc.subject.keyword optically pumped magnetometer
dc.subject.keyword visual system
dc.subject.keyword LOCAL-FIELD POTENTIALS
dc.subject.keyword SOMATOSENSORY CORTEX
dc.subject.keyword WORKING-MEMORY
dc.subject.keyword EEG
dc.subject.keyword SYNCHRONIZATION
dc.subject.keyword DESYNCHRONIZATION
dc.subject.keyword DYNAMICS
dc.subject.keyword RHYTHMS
dc.identifier.urn URN:NBN:fi:aalto-201911076157
dc.identifier.doi 10.1002/hbm.24795
dc.type.version publishedVersion

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