Injections of CRF, TRH, and α–MSH enhance EOD waveforms in vivo. Injections of saline caused little or no change in amplitude or τP2, whereas injections of CRF, TRH, and α–MSH caused clear increases in EOD amplitude (left panel) and τP2 (right panel). Horizontal bars represent means and vertical bars represent SEM. Asterisks indicate conditions statistically different from saline (p < 0.01),