  Conductivity noise in dc current biased La_{0.82}Ca_{0.18}MnO_{3} single
crystals has been investigated in different metastable resistivity states
enforced by applying voltage pulses to the sample at low temperatures. Noise
measured in all investigated resistivity states is of 1/f-type and its
intensity at high temperatures and low dc bias scales as a square of the bias.
At liquid nitrogen temperatures for under bias exceeding a threshold value, the
behavior of the noise deviates from above quasi- equilibrium modulation noise
and depends in a non monotonic way on applied bias. The bias range of
nonequilibrium 1/f noise coincides with the range at which the conductance
increases linearly with bias voltage. This feature is attributed to a broad
continuity of states enabling indirect inelastic tunneling across intrinsic
tunnel junctions. The nonequilibrium noise has been ascribed to indirect
intrinsic tunneling mechanism while resistivity changes in metastable states to
variations in the energy landscape for charge carriers introduced by
microcracks created by the pulse procedures employed
