  We will summarize here some of our measurements of the superconducting
fluctuations effects on the in-plane electrical resistivity (the so-called
in-plane paraconductivity) in La_{2-x}Sr_xCuO_4 thin films with different Sr
content. Our results suggest that these superconducting fluctuations effects
are not related to the opening of a pseudogap in the normal-state of underdoped
compounds.
