Changes in the amplitude and the latencies of peak P300 of acoustical evoked potential on a background of the verbal stimulus novelty loss were used for determination of the brain activity specifity in individuals with various anxiety levels. The increase of the peak P300 latency of acoustical evoked potential on a background of trace processes arising after habituation was determined. This parameter did not depend on an anxiety level. However, the latency change depended on the attentional level to a submitted signal. The peak P300 amplitude in the right temporal cortex field was connected with the anxiety level--there was a growth of amplitude on a habituation background with the low anxious subjects, and with the highly anxious people the changes of this parameter were not observed. The anxiety level has rendered influence to dehabituation reaction. Dehabituation is observed with the low-anxiety subjects.