The cortex must permanently deal with stimuli coming from the environment, perceived through different sensors spatially separated. These stimuli converge in the cortex to be processed together in order to construct a multisensory and coherent view of the world. When somebody is hearing /ba/ and is simultaneously viewing the lips movements corresponding to /ga/, he is perceiving /da/. This phenomenon, known as McGurk effect, reveals the cross correlation between different modalities. Some cortical areas are mainly dedicated to the processing of a specific perception. These areas are topographically organized, meaning that two spatially close neurons respond to close stimuli. The purpose of this paper is to modify the BCM synaptic rule to obtain a self organization of a neuronal map. We introduce a feedback modulation of the learning rule, representing multimodal constraints of the environment. This feedback will be obtained by using a multimap and multilevel architecture of modality assembling.