Figure 6. Modulation by citalopram does not occur when the brainstem is removed.

A, schematic diagram of the isolated brainstem–spinal cord preparation. B, raw traces with stimulus artifacts removed. B, raw neurograms under control conditions (a) and 30–60 min after citalopram was added (b). Time scale bar = 2 s. Neither the phase lag (C), nor burst amplitude (D), nor cycle period (E) was changed by the addition of citalopram to the bath (P > 0.05). Error bars represent the standard error of the mean.