Effect of pre-transition stimulus duration on acoustic change complex.
OBJECTIVE
To investigate the effect of pre-transition duration on acoustic change complex (ACC) for speech and tonal stimulus.


METHODS
Cortical potentials were recorded for consonant-vowel syllable and tonal complex stimuli with varying pre-transition durations.


METHODS
Ten individuals (three male and seven female) in the age range from 18 to 26 years, with normal hearing sensitivity, participated in the study.


RESULTS
The results revealed that a minimum pre-transition duration of 100 ms for tonal stimulus (with spectral change) and 80 ms for consonant-vowel syllable is necessary in order to elicit ACC. The latency of N1(1) and P2(1), which is the response for change within the ongoing stimulus, increased with increase in pre-transition duration. The amplitude of the evoked responses did not show any significant change.


CONCLUSIONS
It was found that minimum pre-transition duration required in eliciting ACC for speech and non-speech stimulus is not same. The speech stimulus required lesser duration of pre-transition than non-speech stimulus. Further studies regarding the acoustic aspects of sound on CAEP in isolation are warranted.
Department of Audiology, All India Institute of Speech and Hearing, Mysore University, Karnataka, India. ganapathy.mk8@gmail.com
M K
MK
Ganapathy
Vijay Kumar
VK
Narne
Mohan Kumar
MK
Kalaiah
P
P
Manjula
D000161:Acoustic Stimulation / Q000379:methods*; D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001301:Audiometry, Pure-Tone; D001302:Audiometry, Speech; D001309:Auditory Threshold; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D011930:Reaction Time; D013018:Sound Spectrography; D013061:Speech Acoustics; D013067:Speech Perception; D013997:Time Factors; D055815:Young Adult