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The Journal of Neuroscience, May 1, 2002, 22(9):3739-3754
Oscillatory Neuronal Synchronization in Primary Visual Cortex as a Correlate of Stimulus Selection
Pascal Fries1, *, Jan-Hinrich Schröder2, *, Pieter R. Roelfsema3, Wolf Singer2, and Andreas K. Engel4 1 F. C. Donders Centre for Cognitive Neuroimaging, 6525 EK Nijmegen, The Netherlands, 2 Max-Planck-Institute for Brain Research, 60528 Frankfurt, Germany, 3 Academic Medical Center, Department of Visual System Analysis/Medical Physics, 1105 AZ Amsterdam, The Netherlands, and 4 Research Center Jülich GmbH, Institute for Medicine, Cellular Neurobiology Group, 52425 Jülich, Germany
Spike and local field potential activity were recorded simultaneously from multiple sites in primary visual cortex of strabismic cats, while monocular stimulation alternated with dichoptic stimulation, inducing interocular rivalry. During interocular rivalry, there is competition between the two nonfusible stimuli presented to the two eyes, and only one stimulus is selected at any time. We biased this competition in three different ways: (1) we exploited the condition that in strabismic cats there is often one dominant eye that is selected for most of the time. (2) We presented the two stimuli with a temporal offset, which biases competition in favor of the newly appearing stimulus. (3) We presented the two stimuli with highly different contrasts, which biases competition in favor of the stimulus with higher contrast. Whenever competition was biased in favor of the stimulus activating the recorded neurons, gamma-frequency synchronization of the respective responses was enhanced, and vice versa. Firing rates showed some differences between stimulation conditions. However, when present, these changes were inversely related to a competitive advantage of the respective stimulus. We hypothesize that enhanced gamma-frequency synchronization in primary visual cortex is a correlate of stimulus selection. Synchronization is likely to be translated into firing rate changes at later processing stages.
Key words: synchronization; oscillation; gamma; strabismus; competition; rivalry; selection
* P.F. and J.-H.S. contributed equally to this work
Copyright © 2002 Society for Neuroscience 0270-6474/02/2293739-16$05.00/0
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