Auditory spatial resolution in horizontal, vertical, and diagonal planes
Auditory spatial resolution in horizontal, vertical, and diagonal planes
复制标题
DOI：
10.1121/1.1590970
复制
发表时间：
2003-08-01
影响因子：
2.4
通讯作者：
Erpenbeck, EA
中科院分区：
文献类型：
--
作者：
Grantham, DW;Hornsby, BWY;Erpenbeck, EA
测量水平、垂直和对角（60度）平面刺激的最小可听角（MAA）和最小可听运动角（MAMA）阈值。采用伪虚拟技术，通过KEMAR的耳朵记录信号，并通过插入式耳机向受试者播放。宽带，高通和低通噪声的抑制。20例受试者中仅6例获得了小于10 °的宽带垂直平面MAA，并且仅这6例受试者被保留用于完整研究。对于所有三种过滤条件，阈值在水平平面中最低，在对角平面中略高（但显著），在垂直平面中最高。这些结果在幅度和模式上与Perrott和Saberi [J. Acoust.美国社会87，1728-1731（1990）]和Saberi和Perrott [J. Acoust.美国社会88，2639-2644（1990）]，除了这些研究者通常发现对角平面的阈值与水平平面的阈值一样好。目前的结果是一致的假设，即对角平面的性能是基于独立的贡献，从水平平面系统（耳间差异敏感）和垂直平面系统（耳廓为基础的光谱变化敏感）。通过KEMAR记录的刺激的测量表明，从对角平面呈现的源在某些频率区域中可以产生比基于轨迹的水平投影所预期的更大的耳间水平差（ILD）。这种频率特定的ILD线索可能是在先前的研究中报告的对角空间分辨率的非常好的性能的基础。本研究中的受试者显然不能在对角平面条件下利用这些线索，可能是因为他们没有将图像外化到空间中的适当位置，也可能是因为缺乏模式化视野。(C)2003年，美国声学学会。
Minimum audible angle (MAA) and minimum audible movement angle (MAMA) thresholds were measured for stimuli in horizontal, vertical, and diagonal (60degrees) planes. A pseudovirtual technique was employed in which signals were recorded through KEMAR's ears and played back to subjects through insert earphones. Thresholds were obtained for wideband, high-pass, and low-pass noises. Only 6 of 20 subjects obtained wideband vertical-plane MAAs less than 10degrees, and only these 6 subjects were retained for the complete study. For all three filter conditions thresholds were lowest in the horizontal plane, slightly (but significantly) higher in the diagonal plane, and highest for the vertical plane. These results were similar in magnitude and pattern to those reported by Perrott and Saberi [J. Acoust. Soc. Am. 87, 1728-1731 (1990)] and Saberi and Perrott [J. Acoust. Soc. Am. 88, 2639-2644 (1990)], except that these investigators generally found that thresholds for diagonal planes were as good as those for the horizontal plane. The present results are consistent with the hypothesis that diagonal-plane performance is based on independent contributions from a horizontal-plane system (sensitive to interaural differences) and a vertical-plane system (sensitive to pinna-based spectral changes). Measurements of the stimuli recorded through KEMAR indicated that sources presented from diagonal planes can produce larger interaural level differences (ILDs) in certain frequency regions than would be expected based on the horizontal projection of the trajectory. Such frequency-specific ILD cues may underlie the very good performance reported in previous studies for diagonal spatial resolution. Subjects in the present study could apparently not take advantage of these cues in the diagonal-plane condition, possibly because they did not externalize the images to their appropriate positions in space or possibly because of the absence of a patterned visual field. (C) 2003 Acoustical Society of America.