We have investigated the decay of the polarization induced by the appl
ication of electric field pulses of various lengths. Most experiments
were carried out in K0.3MoO3 around 60 K. In this case the characteris
tic time of the stretched exponential relaxation between two equilibri
um states is a few ms. The pulse length was varied between 5 mus < DEL
TAt < 10 ms, and the resulting weak relaxation was detected over 7 dec
ades in time. Our results resemble to the ''aging effect'' found in th
e low temperature thermal relaxation experiments, but we argue that bo
th phenomena can be well described in the framework of a simple linear
response theory.