[The individual typological characteristics of operator activity during long-term monotonous work on the computer]. / Individual'no-tipologicheskie osobennosti operatorskoi deiatel'nosti pri dlitel'noi monotonnoi rabote na komp'iutere.

Individual neurophysiological and psychophysiological characteristics were analyzed in two groups of subjects with different extraversion and genetically determined levels of cortical activity during learning the novel for them monotonous computer operation. Most of the subjects improved their performance to the end of four-hour work. The degree of visual fatigue correlated with changes in P70 component of the evoked potentials. The intergroup difference was revealed in overcoming the visual discomfort during attention concentration. The visual cortex was facilitated in the introverts with high-voltage cortical activity (1st group) and disfacilitated in the extraverts with the low-voltage cortical activity (2nd group). Increase of the simple motor reaction time in the extraverts is considered as a result of temporary impairment of the visual function during the monotonous operator's work, and the worsening of the emotional condition as a consequence of the visual discomfort. The problems are discussed concerning different adaptation mechanisms in realization of the activity under study depending on the genetically determined features of the CNS.

[Changes in the late components of evoked cortical potentials during the human solving of a visual-spatial task]. / Izmeneniia pozdnykh komponentov vyzvannykh korkovykh potentsialov pri reshenii chelovekom zritel'no-prostranstvennoi zadachi.

The ability of mental construction of easily verbalized geometric figures was studied in 20 healthy subjects by means of recording of the evoked potentials of the cerebral cortex. Fragments of geometric figures were presented with the intervals of 80 and 500 ms. To one half of the subjects the stimuli were presented unilaterally (both fragments to one and the same visual field, to the left or to the right one) and to the second half of the subjects--bilaterally (the first fragment--to one visual field and the second one--to the other). It was established that the latency of the wave P300 was shorter and the amplitude--greater at correct decisions of the visual-spatial task than at false ones, both at unilateral and bilateral fragments presentation. At a great interval (500 ms), when the effects of masking became significantly weaker, a predominant activation of the left hemisphere was observed: the latency of the late components was shorter and the amplitude--greater, when the information came "directly" to the left hemisphere. The obtained results testify once more to a great variability, dynamic interhemispheric relations, impossibility of connecting the realization of some functions with one of the hemispheres.