Speech intelligibility reduces over distance from an attended location: Evidence for an auditory spatial gradient of attention
Speech intelligibility reduces over distance from an attended location: Evidence for an auditory spatial gradient of attention
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DOI：
10.3758/app.71.1.164
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发表时间：
2009-01-01
影响因子：
1.7
通讯作者：
Carlile, Simon
中科院分区：
文献类型：
--
作者：
Allen, Kachina;Alais, Daved;Carlile, Simon
在注意力的中心焦点处以及在方位角上相距20度、40度和60度的位置处测量言语接收阈值（SRT）。在一个目标与两个掩蔽物并置或掩蔽物在目标两侧+/-20度的情况下进行测量。对于80%的试验，目标是从参加的位置（“预期”），20%来自另一个（“意外”）位置。对于并置刺激，SRT恶化与预期位置的距离增加2.1 dB的60度方位角和5.1 dB的空间分离的目标和掩蔽。在空间上分离的条件下，仍然发现2.9分贝的变化时，目光远离出席的位置。空间注意力似乎可以提高针对干扰源的语音清晰度，并且增益随着与注意力焦点的距离而减小。空间释放掩蔽（RFM）只发现出席的位置。进一步的实验表明，目标位置的不确定性，防止RFM在无人值守的位置。
Speech reception thresholds (SRTs) were measured at a central focus of attention and at 20 degrees, 40 degrees, and 60 degrees locations distant in azimuth. Measurements were taken with one target collocated with two maskers, or with maskers flanking the target by +/- 20 degrees. For 80% of trials, the target was played from the attended location ("expected"), and 20% came from another ("unexpected") location. For collocated stimuli, SRTs worsened with increasing distance from the expected location by 2.1 dB over the 60 degrees azimuth and by 5.1 dB for spatially separated target and maskers. In spatially separated conditions, a 2.9-dB change was still found when gaze was away from the attended location. Spatial attention appears to increase speech intelligibility against interferers, with gain decreasing with distance from the focus of attention. Spatial release from masking (RFM) was only found for the attended location. Further experiments suggest that target location uncertainty prevented RFM at unattended locations.