Abstract
Let ξt, t greater-or-equal, slanted 0, be a d-dimensional Brownian motion. The asymptotic behaviour of the random field ƒmaps to∫t0ƒ(ξs) ds is investigated, where ƒ belongs to a Sobolev space of periodic functions. Particularly a central limit theorem and a law of iterated logarithm are proved leading to a so-called universal law of iterated logarithm.