Neurons Skip a Beat during Fast Ripples

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Neurons Skip a Beat during Fast Ripples Kevin J. Staley Neuron Volume 55, Issue 6, Pages 828-830 (September 2007) DOI: 10.1016/j.neuron.2007.09.005 Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 1 Fast Ripples as Higher Harmonics of Spike Trains (A) An idealized, extracellularly recorded 250 Hz spike train resembles a regularly repeating series of Dirac delta functions. (B) The power spectrum of the spike train shown in (A) exhibits a series of sharp peaks at harmonics of the spike frequency. The areas under the peaks at 250 and 500 Hz are approximately equal. (C) When the signal shown in (A) is band-pass filtered around the 500 Hz peak in the power spectrum, a very regular sinusoidal fast ripple is produced. (D and E) Two different variants of the signal in (A), both of which have twice as much power as (A) in the 500 versus 250 Hz band. (D) has a visually obvious 500 Hz component, which could be generated by out-of-phase 250 Hz oscillators; in (E) the spike frequency remains 250 Hz, and changes in the spike waveforms are responsible for the increase in 500 Hz power. (B)–(E) were generated using fast Fourier transforms. Neuron 2007 55, 828-830DOI: (10.1016/j.neuron.2007.09.005) Copyright © 2007 Elsevier Inc. Terms and Conditions