  The anelastic spectrum of La{2-x}Sr{x}CuO{4} (x = 0, 0.008, 0.019, 0.032) has
been measured down to 1.5 K, in order to see the effect of doping on the
intrinsic lattice fluctuations already found in stoichiometric La{2}CuO{4}, and
identified with tunneling driven tilt modes of the O octahedra. Slight doping
with Sr causes a drastic increase of the transition rates and relaxation
strength of the tunneling systems. The influence of doping on the relaxation
rate is interpreted in terms of direct coupling between between the tilts of
the octahedra and the hole excitations. However, the observed fast dependence
of the rate on temperature cannot be explained in terms of the ususal models of
coupling between a tunneling system and the conduction electrons.
