Auditory evoked responses in human auditory cortex to the variation of sound intensity in an ongoing tone
- 作者：Yoshiharu Soeta ; y.soeta@aist.go.jp ; Seiji Nakagawa
- 关键词：ANOVA ; analysis of variance ; AEP ; auditory evoked potential ; AEF ; auditory evoked field ; ECD ; equivalent current dipole ; fMRI ; functional magnetic resonance imaging ; MRI ; magnetic resonance image ; SPL ; sound pressure level
- 刊名：Hearing Research
- 出版年：2012
- 期刊代码：111_03785955
- 类别：med
- 出版时间：May, 2012
- 卷：287
- 期：1-2
- 页码：67-75
- 文件大小：620 K
摘要
In daily life, variations of sound intensity, frequency, and other auditory parameters, can be perceived as transitions from one sound to another. The neural mechanisms underlying the processing of intensity change are currently unclear. The present study sought to clarify the effects of frequency and initial sound pressure level (SPL) on the auditory evoked response elicited by sounds of different SPL. We examined responses approximately 100聽ms after an SPL change (the N1m鈥?. Experiment 1 examined the effects of frequency on the N1m鈥? Experiment 2 examined the effects of initial SPL on the N1m鈥? The results revealed that N1m鈥?amplitude increased with greater SPL changes. The increase in N1m鈥?amplitude with increasing SPL was almost constant for low frequency sounds (250 and 1000聽Hz); however, this increase was reduced for high frequency sounds (4000聽Hz). The increase in N1m鈥?amplitude was reduced with high initial SPL. The pattern of amplitude change may reflect a difference in activation in the auditory nerve and/or primary auditory cortex.