There is probably only one information system in living nature -the macromolecular system including DNA, RNA and protein. Its unity for the genetic and nervous activity can be followed in the storage of information (heredity, memory) and in its processing (recombination and selection of both genetic and mental information). According to the hypothesis of the code of nerve impulses, nucleotide triplets of the nucleus, or more likely amino acids of the surface protein of the impulse generating area of a neuron, generate a limited variety of interspike intervals so that each amino acid corresponds to a certain interspike interval and this particular interval initiates by means of a specific neurotransmitter, the synthesis of the same amino acid (or nucleotide triplet) in the postsynaptic neuron. Thus, a series of impulses produces in the postsynaptie neuron a sequence of amino acids in a form of a polypeptide identical to the polypeptide of the presynaptie neuron.
MENTAL HOMOLOGUES TO HEREDITY, MUTABILITY AND SELECTION
The storage, processing and expression of information are very different in reproductive, neurobiologieal and immunological phenomena, but it is doubtful that evolution created different informational substances and mechanisms for different systems of living matter. Most probably, the information in the living world is the property of macromolecules -DNA, RNA and protein -and has basically the same nature in all the systems and functions of organisms as well as in culture and technology, which are products of the informational activity of the brain (IVloroz, 1977(IVloroz, , 1980)).
The main functions of DNA are self-reproduction and recombination. Their genetic expressions are respectively heredity and mutability. The purpose of this paper is to analyze the possible expression of these DNA functions in neuronal activity. It is possible to suppose that in the activity of mind,