Keidser Gitte, Dillon Harvey, Convery Elizabeth
National Acoustic Laboratories, 126 Greville Street, Chatswood, New South Wales 2067, Australia.
J Acoust Soc Am. 2008 Sep;124(3):1668-81. doi: 10.1121/1.2951500.
Self-adjustments of variable hearing aid parameters are essential for trainable hearing aids to provide customized amplification for different listening environments. Prompted by a finding of Dreschler et al. [Ear Hear. 29, 214-227 (2008)], this study investigates the effect of the base line (starting) response on self-adjustments of gain in different frequency bands. In a laboratory test, 24 hearing-impaired listeners adjusted the bass, treble, and overall gain to reach their preferred responses from two different base line responses for 12 different listening situations. The adjustments were repeated five times using the preferred response after each adjustment as base line response for the next adjustment. Half of the listeners further compared three different response shapes, within the range of preferred responses, pairwise ten times for preferential and perceptual discrimination. The results revealed that base line response biases were more pronounced at low frequencies and for listeners with a flat hearing loss configuration. While 83% of listeners reliably discriminated between the average selected biased responses, only 25% demonstrated reliable preferences for one response over the other. Listeners who showed preferential discrimination ability were those who were less biased by the base line response. The clinical implication is that self-adjustments should begin from an appropriately prescribed starting response.
对于可训练的助听器而言，可变助听器参数的自我调整对于在不同聆听环境中提供定制放大功能至关重要。受德雷斯勒等人[《耳与听觉》29, 214 - 227 (2008)]研究结果的启发，本研究调查了基线（起始）响应对不同频段增益自我调整的影响。在一项实验室测试中，24名听力受损的听众针对12种不同的聆听情境，从两种不同的基线响应开始，调整低音、高音和总体增益，以达到他们偏好的响应。每次调整后，将偏好的响应作为下一次调整的基线响应，重复调整五次。一半的听众还在偏好响应范围内，对三种不同的响应形状进行两两比较，共进行十次，以进行偏好和感知辨别。结果显示，基线响应偏差在低频以及听力损失呈平坦型的听众中更为明显。虽然83%的听众能够可靠地区分平均选择的有偏差响应，但只有25%的听众表现出对一种响应相对于另一种响应的可靠偏好。表现出偏好辨别能力的听众是那些受基线响应偏差较小的人。临床意义在于，自我调整应从适当规定的起始响应开始。
