How do humans become aware of things, for example, flashes of light, odors, or pain? There is still no convincing answer to this question, though it is key to understanding any kind of consciousness. This article postulates an autorecognition mechanism whereby patterns of input excitation generated by a stimulus in one or several areas of the cortex give rise to patterns of output excitation identical (coinciding in terms of its main features) to the pattern of input excitation. The output excitation pattern is transmitted via massively parallel positive feedback to the inputs of the same areas of the cortex. Identical excitation patterns generated by the stimulus and transmitted by back projections, are combined in the same neural structures, producing intense firing. This cyclic process accentuates the characteristics and intensifies stimulus mapping, creating the optimum conditions for its categorization by a distributed long-term memory. The sensory category is the response of the cortex to the input excitation and is mapped as a specific pattern of neuron activity. Categorization patterns are transmitted to the input and are included in the auto-identification cycle, providing for the intensive mapping of the subjective meaning of the stimulus. Mapping of sensory categories (internal data) as patterns of input neuron activity in the cortex forms the representation of categories to the subject as elements in the mapping of the external world. The result is that the external word is represented to the subject not in terms of the objective features of the physical world, but in terms of sensory categories: color, taste, odor, tactile sensations, etc., which constitutes the phenomenon of sensory awareness.
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