[Electrographically present and trace conditioned reactions to complex stimuli in man].

In experiments on 48 human subjects aged from 16 to 25 years, elaboration of present reactions to a complex stimulus was accompanied by stabilization of SGR not only in response to the first, triggering, and the last, reinforcing, components of the complex stimulus, but also to its central element provided it was a proprioceptive signal. In addition, SGR magnitude at the moment of the stimuli action was more considerable during the formation of trace processes as compared with one observed during elaboration of present reactions. The results obtained lead to the assumption that reproduction of excitation traces is preceded by the brain estimation of the time equal to the interstimuli pause.