Sensory maps and brain development the midbrain auditory nucleus had receptive fields independent of nature and intensity of the sound. Roger Sperry proposed a chemical gradient model for eye rotation and for neuronal wiring diagram. Retinal neurons and target cells had identification tags in the form of chemical gradients so that the projection of neurons would be orderly. For a topographic map of the visual world, the map first forms during neural development via molecular signals, such as chemospecific matching between molecular gradients. The molecular basis of sensory maps and brain development is a field that is being actively explored. The most recent work has
Neurotrophic electrode by the intended listener. The standard advantages and disadvantages of invasive versus non-invasive interfaces still apply. However, for this particular application, the neurotrophic electrode has an advantage in that it has already been shown to be effective for restoring communication to disabled patients. Neurotrophic electrode The neurotrophic electrode is an intracortical device designed to read the electrical signals that the brain uses to process information. It consists of a small, hollow glass cone attached to several electrically conductive gold wires. The term "neurotrophic" means "relating to the nutrition and maintenance of nerve tissue" and the device gets its name from