There has been considerable recent interest in the use of cortical auditory evoked potentials (CAEPs) as an electrophysiological measure of human speech encoding in individuals with normal as well as impaired auditory systems. The development of such electrophysiological measures such as CAEPs is important because they can be used to evaluate the benefits of hearing aids and cochlear implants in infants, young children, and adults that cannot cooperate for behavioral speech discrimination testing. The current study determined whether CAEPs produced by seven different speech sounds, which together cover a broad range of frequencies across the speech spectrum, could be differentiated from each other based on response latency and amplitude measures. CAEPs were recorded from ten adults with normal hearing in response to speech stimuli presented at a conversational level (65 dB SPL) via a loudspeaker. Cortical responses were reliably elicited by each of the speech sounds in all participants. CAEPs produced by speech sounds dominated by high-frequency energy were significantly different in amplitude from CAEPs produced by sounds dominated by lower-frequency energy. Significant effects of stimulus duration were also observed, with shorter duration stimuli producing larger amplitudes and earlier latencies than longer duration stimuli. This research demonstrates that CAEPs can be reliably evoked by sounds that encompass the entire speech frequency range. Further, CAEP latencies and amplitudes may provide an objective indication that spectrally different speech sounds are encoded differently at the cortical level.

译文

:最近,人们对使用皮质听觉诱发电位(CAEP)作为正常和听觉系统受损的人的语音编码的电生理学方法感兴趣。诸如CAEPs之类的电生理指标的发展非常重要,因为它们可用于评估助听器和人工耳蜗在无法配合行为语音辨别力测试的婴儿,幼儿和成人中的益处。当前的研究确定了是否可以根据响应潜伏期和幅度度量来区分由七种不同的语音产生的CAEP,这些CAEP涵盖整个语音频谱的广泛频率范围。记录了十名成年人的CAEPs,这些成年人是通过扬声器以对话级别(65 dB SPL)呈现的语音刺激而正常听力的。在所有参与者中,每种语音都可靠地引起了皮层反应。由高频能量支配的语音产生的CAEP与由低频能量支配的声音产生的CAEP在幅度上有显着差异。还观察到了刺激持续时间的显着效果,持续时间较短的刺激比持续时间较长的刺激产生更大的振幅和更短的等待时间。这项研究表明,包含整个语音频率范围的声音可以可靠地诱发CAEP。进一步地,CAEP等待时间和幅度可以提供客观的指示,即频谱不同的语音在皮质水平上被不同地编码。

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