Cerebral Cortex, Vol. 9, No. 2, 137-150,
March 1999
© 1999 Oxford University Press
Synchronization Between Temporal and Parietal Cortex During Multimodal Object Processing in Man
1 Institut für Neurophysiologie, Universität Wien, Währingerstrasse17, A-1090 Vienna and , 2 Konrad Lorenz Institut für Evolutions- and Kognitionsforschung, A-3422 Altenberg, Austria
A series of recordings in cat visual cortex suggest that synchronous activity in neuronal cell ensembles serves to bind the different perceptual qualities belonging to one object. We provide evidence that similar mechanisms seem also to be observable in human subjects for the representation of supramodal entities. Electroencephalogram (EEG) was recorded from 19 scalp electrodes (10/20 system) in 19 human subjects and EEG amplitude and coherence were determined during presentation of objects such as house, tree, ball. Objects were presented in three different ways: in a pictorial presentation, as spoken words and as written words. In order to find correlates of modality-independent processing, we searched for patterns of activation common to all three modalities of presentation. The common pattern turned out to be an increase of coherence between temporal and parietal electrodes in the 13–18 Hz beta1 frequency range. This is evidence that population activity of temporal cortex and parietal cortex shows enhanced coherence during presentation of semantic entities. Coherent activity in this low-frequency range might play a role for binding of multimodal ensembles.
3 Current address: Institut für Neuroinformatik, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
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