As reported earlier, rhythmic slow activity (RSA) in rat recorded from left and right hippocampus show very low frequency (< 0.5 Hz) phase shift oscillations. The aim of this study was to test the effect of locus coeruleus (LC) stimulation on these oscillations. The adult Wistar rats were implanted with bipolar stainless steel electrodes for chronic recording of RSA in dorsal hippocampi at stereotaxic coordinates: P: 2.8; L/R: 1.5; H: -2.9, and for electric stimulation of left LC: P: 9.8; L: 1.2; H: -6.5. Signals were treated as amplitude modulated theta carrier frequency oscillations. Carrier frequency phase shifts (CFPS) were calculated from theta band Fourier components. CFPS time dependence was obtained using 16 sec moving window through epochs of 64 seconds. CFPS oscillations before and immediately after short lasting LC stimulation were compared both in time and frequency domain. In most cases the stimulation of LC resulted in reduction of amplitudes of CFPS oscillations.