Repetition suppression and effects of familiarity on blood oxygenation level dependent signal and gamma-band activity

Autor(en): Friese, Uwe 
Rahm, Benjamin
Hassler, Uwe
Kaiser, Jochen
Gruber, Thomas 
Stichwörter: blood oxygenation level dependent; EEG; FMRI; functional magnetic resonance imaging; gamma band; magnetoencephalography; MEG; NEURAL MECHANISMS; Neurosciences; Neurosciences & Neurology; oscillation; repetition priming; RESPONSES; TASK; visual object recognition
Erscheinungsdatum: 2012
Herausgeber: LIPPINCOTT WILLIAMS & WILKINS
Journal: NEUROREPORT
Volumen: 23
Ausgabe: 13
Startseite: 757
Seitenende: 761
Zusammenfassung: 
We used an identical repetition priming paradigm in functional MRI (fMRI) and magnetoencephalography (MEG) to investigate brain networks modulated by stimulus repetition and familiarity. In particular, pictures of familiar or unfamiliar objects were presented sequentially, with stimulus repetitions occurring within few trials. The results of both studies indicated close agreement between the pattern found in fMRI-BOLD (blood oxygenation level dependent) responses and in source localizations of induced gamma-band activity derived from MEG. In both studies, the brain regions that were significantly associated with repetition suppression in response to familiar visual objects encompassed bilaterally the medial and lateral occipital cortex, inferior occipitotemporal regions including the left fusiform cortex, as well as parietal areas. Modulations by stimulus familiarity occurred mainly within this network. Overall, we found noticeable correspondences between the results of fMRI-BOLD signals and MEG gamma-band activity, suggesting that both methods can be used in analogous ways to study the neural basis of repetition priming and object recognition. NeuroReport 23:757-761 (C) 2012 Wolters Kluwer Health vertical bar Lippincott Williams & Wilkins.
ISSN: 09594965
DOI: 10.1097/WNR.0b013e328356b173

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