Abstract
In many instances we find information reaching the brain from the sense organs again displayed in geometrical order in some space which has one or more coordinates easily identifiable with coordinates of the sensory space represented. This is trivially true for the visual and tactile maps, more interestingly true for the representation of frequencies in the auditory system. Here the metrics of the internal representation, on a space coordinate representing the logarithm of frequency, corresponds even to the subjective metrics of pitch perception and therefore to the metrics of a piano keyboard, as was shown again at this meeting by Evans in the case of the cochlear nucleus. Only for the chemical senses, olfaction and taste, we have no clue yet as to the meaning of the coordinates of their spatial display within the brain.
