Huang Ying, Kong Lingzhi, Fan Silu, Wu Xihong, Li Liang
Key Laboratory on Machine Perception (Ministry of Education), Department of Psychology, Speech and Hearing Research Center, Peking University, Beijing, China.
Neuroreport. 2008 Nov 19;19(17):1673-8. doi: 10.1097/WNR.0b013e32831576c7.
Human listeners are extraordinarily sensitive to a transient break in interaural correlation (called binaural gap). In this study, a binaural gap embedded in interaurally correlated noise markers elicited marked scalp event-related potentials (ERPs). ERPs to the binaural gap in narrowband noise with the center frequency of 1600 Hz were significantly weaker than those for narrowband noise with the center frequency of 400 or 800 Hz. Introducing the interaural time difference (ITD) of 4 ms weakened the ERPs for either 400-Hz or 800-Hz noise. Introducing the ITD of 2 ms, however, only weakened the ERPs for 800-Hz but not 400-Hz noise. Thus central representations of a transient break in interaural correlation for narrowband noises are affected by both frequency and ITD.
人类听众对耳间相关性的短暂中断(称为双耳间隙)异常敏感。在本研究中,嵌入耳间相关噪声标记中的双耳间隙引发了明显的头皮事件相关电位(ERP)。中心频率为1600Hz的窄带噪声中双耳间隙的ERP明显弱于中心频率为400或800Hz的窄带噪声的ERP。引入4ms的耳间时间差(ITD)会减弱400Hz或800Hz噪声的ERP。然而,引入2ms的ITD只会减弱800Hz噪声的ERP,而不会减弱400Hz噪声的ERP。因此,窄带噪声耳间相关性短暂中断的中枢表征受频率和ITD两者的影响。