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The Journal of Neuroscience, August 22, 2007, 27(34):9238-9245; doi:10.1523/JNEUROSCI.4512-06.2007

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 Previous Article

Cellular/Molecular
Amplitude Modulation Patterns of Local Field Potentials Reveal Asynchronous Neuronal Populations

Javier Díaz,1 Pablo Razeto-Barry,1 Juan-Carlos Letelier,1 John Caprio,3 and Juan Bacigalupo1,2

1Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile 7800023, and 2Institute of Cell Dynamics and Biotechnology, University of Chile, Santiago, Chile 8370456, and 3Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803

Correspondence should be addressed to Juan Bacigalupo, Department of Biology, University of Chile, Las Palmeras 3425, Nunoa, Santiago, Chile 7800023. Email: bacigalu{at}uchile.cl

Neural oscillations, which appear in several areas of the nervous system and cover a wide frequency range, are a prominent issue in current neuroscience. Extracellularly recorded oscillations are generally thought to be a manifestation of a neural population with synchronized electrical activity resulting from coupling mechanisms. The vertebrate olfactory neuroepithelium exhibits ß-band oscillations, termed peripheral waves (PWs), in their population response to odor stimulation. Here, we examine PWs in the channel catfish and propose that their properties could be explained as the superposition of asynchronous oscillators. Our model shows that the intriguing random pattern of amplitude-modulated PWs could be explained by Rayleigh fading, an interference phenomenon well known in physics and recognizable using statistical methods and signal analysis. We are proposing a mathematical fingerprint to characterize neural signals generated by the addition of random phase oscillators. Our interpretation of PWs as arising from asynchronous oscillators could be generalized to other neuronal populations, because it suggests that neural oscillations, detected in local field potential recordings within a narrow frequency band, do not necessarily originate from synchronization events.

Key words: peripheral waves; Rayleigh fading; olfactory epithelium; olfactory neuron; Kuramoto model; neuronal synchronization

Received April 13, 2006; revised June 5, 2007; accepted June 6, 2007.

Correspondence should be addressed to Juan Bacigalupo, Department of Biology, University of Chile, Las Palmeras 3425, Nunoa, Santiago, Chile 7800023. Email: bacigalu{at}uchile.cl






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