Abstract: In this experiment some psychological conditions were further controlled,the effects of the selective attention and the novelty of the environment andstimuli on the late components of auditory evoked potentials of the human brainwere studied simultaneously in the same group of subjects. The resultsindicated: During selective attention, wave N_1, P_2 latency increased andamplitude enhanced; wave P_3 amplitude enhanced. Novelty of the environmentand stimuli caused wave N_1 latency increase and amplitude enbance; wave P_2N_2 P_3 amplitude enhance. we observed some EP, in which the amplitude islarger when the stimulus is weak, the ampltude is smaller when the stimulusis stronger. The results were discussed.

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