![]() ![]() Optimal information transfer in the cortex through synchronization. Synaptic dynamics and excitation-inhibition balance. What determines the frequency of fast network oscillations with irregular neural discharges? I. Attentional stimulus selection through selective synchronization between monkey visual areas. ![]() Journal of Neuroscience Methods, 192.1, 146–51. Chronux: a platform for analyzing neural signals. MIT Press.īokil, H., Andrews, P., Kulkarni, J.E., Mehta, S., Mitra, P.P. In Local field potentials, BOLD and spiking activity: relationships and physiological mechanisms (pp. Visual population codes - towards a common multivariate framework for cell recording and functional imaging. PLoS Computational Biology, 8.3, e1002438. Dynamic effective connectivity of inter-areal brain circuits. However, the sensitivity of locking to frequency mismatch suggests that only a precise and active control of gamma frequency could enable the selection of communication channels and their directionality.īattaglia, D., Witt, A., Wolf, F., Geisel T. Our results indicate that once two populations lock their peak frequencies, an optimal phase relation for communication appears. ![]() To test the efficiency of communication we evaluated the success of transferring rate-modulations between the two areas. Such difference between LFPs and MUAs behavior is due to the misalignment between the arrival of afferent synaptic currents and the local excitability windows. For increasing frequency detunings we found a significant decrease in the phase coherence (at non-zero phase lag) between the MUAs but not the LFPs of the two areas. Importantly, for similar gamma peak frequencies a zero phase difference emerges for both LFP and MUA despite small axonal delays. We observed that a moderate excitatory coupling between the two areas leads to a decrease in their frequency detuning, up to ∼6 Hz, with no frequency locking arising between the gamma peaks. In particular, we explore a biophysical model of the reciprocal interaction between two cortical areas displaying gamma oscillations at different frequencies, and quantify their phase coherence and communication efficiency. Here, we investigate how a mismatch between the frequencies of gamma oscillations from two populations affects their interaction. One popular hypothesis states that a flexible routing of information between distant populations occurs via the control of the phase or coherence between their respective oscillations. While several aspects of gamma rhythmogenesis are relatively well understood, we have much less solid evidence about how gamma oscillations contribute to information processing in neuronal circuits. Gamma oscillations are thought to reflect rhythmic synaptic activity organized by inhibitory interneurons. Neuronal gamma oscillations have been described in local field potentials of different brain regions of multiple species. ![]()
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