Garinis Angela C, Glattke Theodore, Cone-Wesson Barbara K
Department of Speech, Language and Hearing Sciences, University of Arizona, Tucson, AZ 85721-0071, USA.
Int J Audiol. 2008 Oct;47(10):607-14. doi: 10.1080/14992020802129402.
The presentation of contralateral noise during the recording of transient evoked otoacoustic emissions (TEOAEs) reduces the amplitude of the TEOAE in normally-hearing adults. This is known as TEOAE suppression. The present study investigated TEOAE suppression in 18 adults with learning disabilities (LDs) compared to 18 adults without LDs. TEOAEs were elicited by 60 dB p.e. SPL clicks and were suppressed by the presentation of 60 dB SPL contralateral broadband noise. Suppression was measured as a change in the overall TEOAE response amplitude, and also analysed in 2-ms epochs representing different TEOAE frequency-response bands. A significant interaction was evident between group type and ear tested. Participants in the control group had right ear dominance for the suppression effect, whereas the left ear was found to be dominant for the LD group. These findings suggest a mechanism of the medial olivary cochlear bundle and efferent auditory pathway that differs in those with LD compared to those with typical learning abilities.
在记录瞬态诱发耳声发射（TEOAEs）期间呈现对侧噪声会降低听力正常成年人的TEOAE幅度。这被称为TEOAE抑制。本研究调查了18名有学习障碍（LDs）的成年人与18名无学习障碍的成年人的TEOAE抑制情况。TEOAE由60 dB等效声压级（p.e. SPL）的短声诱发，并通过呈现60 dB SPL的对侧宽带噪声进行抑制。抑制被测量为TEOAE总体反应幅度的变化，并在代表不同TEOAE频率反应带的2毫秒时间段内进行分析。在组类型和测试耳之间存在明显的显著交互作用。对照组参与者的抑制效应表现为右耳优势，而LD组则发现左耳占优势。这些发现表明，与具有典型学习能力的人相比，有LD的人的内侧橄榄耳蜗束和传出听觉通路的机制有所不同。
