An electroencephalographic study dealing with timbre perception has been performed. Timbre is next to tone and chroma is the basic element of sound and is perceived as a multidimensional space in which perceptual coordinates correlate with acoustic parameters. To show these correlations and their associations with different brain areas, sounds all constant with respect to their fundamental pitch of 311 Hz were varied in timbre. Due to these variations of acoustical parameters clear differences could be found concerning the perceptional pathway and corresponding brain areas. The modification applied to the sounds included variations of attack time, spectral center of gravity, and even harmonic attenuation. Next to other findings a hierarchy of perception was found where variations of the attack time was overwritten by the even harmonic attenuation and the spectral centroit variations, but only if all three were varied simultaneously. In all other cases the attack time variations caused clear perceptional delays in the prefrontal lobe.