Role of feedback signals to hindbrain in discriminating between two objects in electrolocation

In order to clarify the neuronal mechanism by which the weakly electric fish discriminates between two objects presented nearby the fish body, we propose a model of electrosensory system including the feedforward signals from receptors and the feedback signals from higher nuclei. The distortion of electric organ discharge (EOD), induced by two objects, were calculated by the model of fish body. We show that the information relevant to each object is roughly separated by the synchronicity of burst patterns evoked on electrosensory lateral-line lobe (ELL) map. The functional roles of feedback signals to ELL are to facilitate the temporal separation of burst patterns evoked on ELL map, and to amplify selectively the burst pattern relevant to an attentive object.