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. 2010 May 14;4:13. doi: 10.3389/fncir.2010.00013

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Copyright © 2010 Abrams, Warrier, Trauner and Zhang.

This is an open-access article subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.

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Calcium frequency transitions. (A,B) Spectrograms displaying discontinuities in the frequency, with a frequency doubling of the Ca²⁺ spikes. Arrow represents the frequency doubling. (A) Shift from 4.5 to 9 Hz; (B), shift from 7 to 14 Hz. (C) Time-domain recording of the transition point between the two frequencies occurring in (A). (D,E) Spectrograms displaying a transient decay to a steady state frequency. (C) τ = 7.2 s; (D) τ = 8.1 s. The second harmonic artifact of the Ca²⁺ spikes is distinctly visible in (A,B and D). (F) A spectrogram displaying both a frequency doubling, followed by a steady-state recovery transient.