Kluk Karolina, Moore Brian C J
Department of Experimental Psychology, University of Cambridge, Cambridge, UK.
Int J Audiol. 2006 Aug;45(8):463-76. doi: 10.1080/14992020600753189.
A dead region (DR) is a region of the cochlea where there are no functioning inner hair cells and/or neurones. We compared the edge frequencies, fe, of DRs estimated using four methods: the TEN(HL) test; psychophysical tuning curves (PTCs) measured in simultaneous masking (320-Hz wide noise masker) using a 'fast' method (sweeping masker) and a 'classical' method; and PTCs measured in forward masking (sinusoidal masker) using a 'classical' method. Fourteen subjects with high-frequency DRs were tested. For measurement of PTCs, the signal frequency was chosen to fall inside the DR; the tip frequencies of the PTCs were taken as indicating the values of fe. The values of fe obtained from the PTCs in forward and simultaneous masking (both fast and classical methods) were similar and were usually close to, but somewhat above, the values of fe estimated from the TEN(HL) test. Fast PTCs measured in simultaneous masking are recommended for use in clinical practice, as they give a precise estimate of fe and are quick to administer.
死区（DR）是耳蜗中没有功能正常的内毛细胞和/或神经元的区域。我们比较了使用四种方法估计的死区的边缘频率fe：TEN(HL)测试；使用“快速”方法（扫频掩蔽器）和“经典”方法在同时掩蔽（320赫兹宽噪声掩蔽器）中测量的心理物理调谐曲线（PTC）；以及使用“经典”方法在前向掩蔽（正弦掩蔽器）中测量的PTC。对14名患有高频死区的受试者进行了测试。为了测量PTC，信号频率被选择落在死区内；PTC的尖峰频率被视为fe的值。在前向掩蔽和同时掩蔽（快速和经典方法）中从PTC获得的fe值相似，并且通常接近但略高于从TEN(HL)测试估计的fe值。建议在临床实践中使用在同时掩蔽中测量的快速PTC，因为它们能精确估计fe且实施快速。
