Abstract
At the present time neurophysiologists are concentrating their efforts on finding a solution to the problem of the functional organization of the central nervous system. Very probably both the temporal and the spatial parameters of activity of individual neural units are used for coding information in the central nervous system. The numerous investigations demonstrating changes in discharge frequency in response to stimulation are evidence of the first. The role of spatial parameters is shown by investigations revealing integration of impulses of different modalities at one neuron. This was demonstrated, in particular, by the fact that the activity of a neuron during simultaneous action of stimuli of two modalities differed from the responses to each of them (Baumgartner, 1958; Lomo and Mollica, 1960; Skrebitskii and Voronin, 1965; and others). The second hypothesis is also supported by the existence of neurons possessing complex receptor fields (Hubel and Wiesel, 1962). According to these workers, the activity of such neurons is the result of their integration of activity of neurons with simple receptor fields.
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