title: Early dissociation of face and object processing: a magnetoencephalographic study.
abstract: The early dissociation in cortical responses to faces and objects was explored with magnetoencephalographic (MEG) recordings and source localization. To control for differences in the low-level stimulus features, which are known to modulate early brain responses, we created a novel set of stimuli so that their combinations did not have any differences in the visual-field location, spatial frequency, or luminance contrast. Differing responses to face and object (flower) stimuli were found at about 100 ms after stimulus onset in the occipital cortex. Our data also confirm that the brain response to a complex visual stimulus is not merely a sum of the responses to its constituent parts; the nonlinearity in the response was largest for meaningful stimuli.
authors.affiliation: Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia. ana@phy.hr
authors.forename: Ana
authors.initials: A
authors.lastname: Susac
authors.forename: Risto J
authors.initials: RJ
authors.lastname: Ilmoniemi
authors.forename: Elina
authors.initials: E
authors.lastname: Pihko
authors.forename: Jussi
authors.initials: J
authors.lastname: Nurminen
authors.forename: Selma
authors.initials: S
authors.lastname: Supek
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D013223:Statistics as Topic