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. Author manuscript; available in PMC: 2009 Oct 5.
Published in final edited form as: Brain Res. 2007 Nov 4;1188:76–86. doi: 10.1016/j.brainres.2007.10.081

Fig. 1.

Fig. 1

Communication calls, call-evoked local field potentials (LFP) and their power spectra. Bat communication signals consist of simple ‘syllables’, or monosyllabic calls (Kanwal et al., 1994). Two examples in (a) and (b) show calls # 7 (descending Rippled FM or dRFM) and # 1 (short quasi CF or qCFs), respectively, with call amplitude envelopes (1) and spectrograms (2) as well as the corresponding LFPs (3) and the ‘gamma-band responses’ obtained by band-pass filtering the LFP from 20–100 Hz (4). (c, d) Power spectra of the LFPs shown in (a) and (b), respectively. Note prominent spectral peaks at frequencies above 20 Hz. (e, f) Gamma-band responses shown in (a) and (b) are reproduced at a higher temporal resolution along with the corresponding PSTHs summed from two simultaneously recorded single units. Note that peaks of neuronal activity coincide with either positive (marked by black vertical lines) or negative (marked by blue vertical lines) peaks of gamma-band oscillations.