Tracking Memory Operations With MEG

This week, Osipova et al. made use of the high temporal and spatial resolution of magnetoencephalography (MEG) to examine oscillatory activity associated with a memory task. The authors presented subjects with a series of pictures of buildings or landscapes in an encoding session. Then subjects were asked in a retrieval session whether they had previously viewed the images. During encoding, gamma (60–90 Hz) and theta (4.5–8.5 Hz) activity was stronger for items that were later remembered than for those that were later forgotten. Likewise, in the retrieval session, gamma and theta activity were stronger for recognized items than for correctly rejected items. Theta activity originated in parietotemporal areas, whereas gamma activity arose occipitally in Brodmann areas 18 and 19. The authors suggest that neural synchronization represented by occipital gamma activity may reflect either stronger drive to areas involved in memory or to reinforcement from those same areas.

Daria Osipova, Atsuko Takashima, Robert Oostenveld, Guillén Fernanndez, Eric Maris, and Ole Jensen

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Tracking Memory Operations With MEG