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
Pinky and the Brain the head. A few times in the series Pinky and Brain indeed pondered the same thing, though in one of these Pinky dismissed his idea as being too stupid. Just one time the answer was "Yes I am!", when Pinky's intelligence is elevated to match Brain's. In another episode, it turns out that what Pinky was pondering was that he and Brain never ponder the same thing, which turned out to be part of what Brain was pondering as well. In a short episode ("Pinky's POV") the spectator sees everything Pinky sees (including his imaginations) and hears his thoughts. His