[Effect of stimulus intensity on auditory event-related potentials evoked by tone and speech].
OBJECTIVE
To explore the effect of stimulus intensity on auditory event-related potentials (AERP) evoked by tone stimuli and speech stimuli respectively.


METHODS
Normal young participants were tested by both tone and speech stimulus with different intensity levels. Range of the intensity for the typical AERP to tone stimuli and speech stimuli were compared. Whether the effect of intensity on,speech stimuli AERP test is the same as that of the tone stimuli were analyzed.


RESULTS
When intensity level ranged from 40 dBSL to 70 dBSL, typical AERP were recorded more easily with speech stimuli than with tone stimuli (P < 0.01). When stimulated by speech stimuli or by tone stimuli, the latency of P300 decreased with higher intensity, the influences of intensity to P300 latency have significant difference (P < 0.01), but not to P300 peak amplitude.


CONCLUSIONS
The effect of stimulus intensity on AERP evoked by speech stimuli is the same to the tone stimuli, but intensity range for typical AERP of speech stimuli was wider than tone stimuli. It may be resulted from that information contained in speech stimulus is more abundant than that contained in tone stimulus, or subjects were more familiar with speech stimulus than tone stimulus.
Ouyang
Tianbin
T
Department of Otorhinolaryngology-Head and Neck Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
Liang
Yong
Y
Li
Suwei
S
D000161:Acoustic Stimulation / Q000379:methods*; D000328:Adult; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time; D013060:Speech; D055815:Young Adult