Grange Jacques A, Culling John F
School of Psychology, Cardiff University, Tower Building, Park Place, Cardiff CF103AT, United Kingdom.
J Acoust Soc Am. 2016 Feb;139(2):703-12. doi: 10.1121/1.4941655.
Spatial release from masking is traditionally measured with speech in front. The effect of head-orientation with respect to the speech direction has rarely been studied. Speech-reception thresholds (SRTs) were measured for eight head orientations and four spatial configurations. Benefits of head orientation away from the speech source of up to 8 dB were measured. These correlated with predictions of a model based on better-ear listening and binaural unmasking (r = 0.96). Use of spontaneous head orientations was measured when listeners attended to long speech clips of gradually diminishing speech-to-noise ratio in a sound-deadened room. Speech was presented from the loudspeaker that initially faced the listener and noise from one of four other locations. In an undirected paradigm, listeners spontaneously turned their heads away from the speech in 56% of trials. When instructed to rotate their heads in the diminishing speech-to-noise ratio, all listeners turned away from the speech and reached head orientations associated with lower SRTs. Head orientation may prove valuable for hearing-impaired listeners.
传统上，空间掩蔽释放是通过前方的语音来测量的。头部朝向与语音方向的关系很少被研究。针对八种头部朝向和四种空间配置测量了言语接受阈值（SRT）。测量到头部远离语音源时的益处高达8分贝。这些与基于较好耳聆听和双耳掩蔽解除的模型预测相关（r = 0.96）。当听众在消声室中收听信噪比逐渐降低的长语音片段时，测量了自发头部朝向的使用情况。语音由最初面向听众的扬声器播放，噪声来自其他四个位置之一。在无定向范式中，听众在56%的试验中会自发地将头部转向远离语音的方向。当被指示在信噪比逐渐降低时转动头部时，所有听众都会转头远离语音，并达到与较低SRT相关的头部朝向。头部朝向可能对听力受损的听众很有价值。
