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Pregled bibliografske jedinice broj: 521369

Size matters : MEG empirical and simulation study on source localization of the earliest visual activity in the occipital cortex


Josef Golubić, Sanja; Sušac, Ana; Grilj, Veljko; Ranken, Douglas; Huonker, Ralph; Haueisen, Jens; Supek, Selma
Size matters : MEG empirical and simulation study on source localization of the earliest visual activity in the occipital cortex // Medical & biological engineering & computing, 49 (2011), 5; 545-554 doi:10.1007/s11517-011-0764-9 (međunarodna recenzija, članak, znanstveni)


CROSBI ID: 521369 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Size matters : MEG empirical and simulation study on source localization of the earliest visual activity in the occipital cortex

Autori
Josef Golubić, Sanja ; Sušac, Ana ; Grilj, Veljko ; Ranken, Douglas ; Huonker, Ralph ; Haueisen, Jens ; Supek, Selma

Izvornik
Medical & biological engineering & computing (0140-0118) 49 (2011), 5; 545-554

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
magnetoencephalography (MEG); stimulus size; cortical source extent; neuromagnetic multi-source localization; retinotopic organization of the human visual cortex; cortical magnification factor; occipital visual cortex

Sažetak
While the relationship between sensory stimulation and tasks and the size of the cortical activations is generally unknown, the visual modality offers a unique possibility of an experimental manipulation of stimulus size-related increases of the spatial extent of cortical activation even during the earliest activity in the retinotopically organized primary visual cortex. We used magnetoecephalography (MEG), visual stimuli of increasing size, and numerical simulations on realistic cortical surfaces to explore the effects of increasing spatial extent of the activated cortical sources on the neuromagnetic fields, location estimation biases, and source resolution. Source localization was performed assuming multiple dipoles in a sphere model using an efficient, automatically restarted multi-start simplex minimizer within the Calibrated Start Spatio- Temporal (CSST) algorithm. We found size-related effects on amplitude and latencies and differences in relative locations of the earliest occipital sources evoked by stimuli of increasing size presented at the same eccentricity. This finding was confirmed by single patch simulations. Additionally, simulations of multiple extended sources demonstrated size-related increase in limits in source resolution for bilaterally simulated sources, biases in location estimates for a given separation of sources, and limits in source resolution due to source multiplicity within a hemisphere.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekti:
119-1081870-1252 - Kognitivna neurodinamika (Supek, Selma, MZOS ) ( POIROT)

Ustanove:
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Avatar Url Ana Sušac (autor)

Avatar Url Veljko Grilj (autor)

Avatar Url Selma Supek (autor)

Avatar Url Sanja Josef Golubić (autor)

Citiraj ovu publikaciju

Josef Golubić, Sanja; Sušac, Ana; Grilj, Veljko; Ranken, Douglas; Huonker, Ralph; Haueisen, Jens; Supek, Selma
Size matters : MEG empirical and simulation study on source localization of the earliest visual activity in the occipital cortex // Medical & biological engineering & computing, 49 (2011), 5; 545-554 doi:10.1007/s11517-011-0764-9 (međunarodna recenzija, članak, znanstveni)
Josef Golubić, S., Sušac, A., Grilj, V., Ranken, D., Huonker, R., Haueisen, J. & Supek, S. (2011) Size matters : MEG empirical and simulation study on source localization of the earliest visual activity in the occipital cortex. Medical & biological engineering & computing, 49 (5), 545-554 doi:10.1007/s11517-011-0764-9.
@article{article, year = {2011}, pages = {545-554}, DOI = {10.1007/s11517-011-0764-9}, keywords = {magnetoencephalography (MEG), stimulus size, cortical source extent, neuromagnetic multi-source localization, retinotopic organization of the human visual cortex, cortical magnification factor, occipital visual cortex}, journal = {Medical and biological engineering and computing}, doi = {10.1007/s11517-011-0764-9}, volume = {49}, number = {5}, issn = {0140-0118}, title = {Size matters : MEG empirical and simulation study on source localization of the earliest visual activity in the occipital cortex}, keyword = {magnetoencephalography (MEG), stimulus size, cortical source extent, neuromagnetic multi-source localization, retinotopic organization of the human visual cortex, cortical magnification factor, occipital visual cortex} }
@article{article, year = {2011}, pages = {545-554}, DOI = {10.1007/s11517-011-0764-9}, keywords = {magnetoencephalography (MEG), stimulus size, cortical source extent, neuromagnetic multi-source localization, retinotopic organization of the human visual cortex, cortical magnification factor, occipital visual cortex}, journal = {Medical and biological engineering and computing}, doi = {10.1007/s11517-011-0764-9}, volume = {49}, number = {5}, issn = {0140-0118}, title = {Size matters : MEG empirical and simulation study on source localization of the earliest visual activity in the occipital cortex}, keyword = {magnetoencephalography (MEG), stimulus size, cortical source extent, neuromagnetic multi-source localization, retinotopic organization of the human visual cortex, cortical magnification factor, occipital visual cortex} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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