Cite as:
Benmussa F, Dornbierer J-G, Paradis A-L, Lorenceau J, 2011, "Looking for the LOC with MEG using frequency-tagged natural objects" Perception 40 ECVP Abstract Supplement, page 64
Looking for the LOC with MEG using frequency-tagged natural objects
F Benmussa, J-G Dornbierer, A-L Paradis, J Lorenceau
fMRI studies found that lateral occipital complex is preferentially activated by visual objects. Here, we use frequency-tagged 3D dot scans of natural objects, and their scrambled counterparts, to elicit well characterized sustained MEG responses at expected frequencies. Shape tagging, consisting of RSVP of Objects/Scrambles, was compared to feature tagging -including luminance reversal, dot renewal and periodic motion- with a single object. Retinotopic mapping and localizer-defined ROIs from fMRI were also compared to and used for magnetic source imaging. We studied the dynamics of object processing using two tagging frequencies—2.5 and 12 Hz. Results indicate that the strength and extent of the steady-state response vary with tagging frequency and the type of tagged feature: at 2.5 Hz, activities spread from V1 to temporal areas while they are more restricted to the occipital lobe at 12 Hz. Shape tagging reveals larger activations in the temporal lobe than tagging with single objects presentation. Contrasting mixture of Object/Scramble to Object or Scramble alone conditions reveals an enhanced object-related activity for the mixed condition emerging around 150 ms. Altogether, the results indicate that frequency-tagging with MEG can powerfully uncover the localization and dynamics of perceptual processes underlying object processing.
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