Figure 7. Decomposition of the CCHs in the firing rate domain.

The CCH in A (thin curve) is the cumulative CCH of 30 cerebellar Golgi cell pairs recorded in anaesthetized rats (Vos et al. 1999a). This CCH was decomposed into seven firing rate-selective CCHs (see Methods), ranked by increasing instantaneous firing rate domains (B–H, labels show spikes s⁻¹). The number of reference spikes was 409 837 (A), 5112 (B), 19 596 (C), 65 402 (D), 148 519 (E), 111 340 (F), 42 435 (G) and 17 433 (H). The CCHs indicated by thick lines in A–H were obtained after cutting the lowest non-zero harmonic frequencies in a discrete Fourier transform of the CCH in the −1024 to 1024 ms time domain. In each CCH, the number of frequencies cut was adjusted to maximize the normalized central peak height (see Methods) and measured 5 (A), 4 (B), 0 (C), 0 (D), 4 (E), 9 (F), 29 (G) and 55 (H). The thin curves in F–H are non-filtered CCHs.