From the fluctuation conductivity behavior of a system information con
cerning its dimensionality and its change with temperature can be stud
ied and the cross-over point of this change can be determined as well.
Besides the above characteristics sometimes, depending on the relatio
ns of some constants of the material, percolative fractal behavior eme
rges in the fluctuation behavior. The above behavior has been recogniz
ed out of paraconductivity measurements in a polycrystal YBaCuO sample
as it has been also observed in some other samples.