EFFECTIVE ATTENUATION OF SIGNALS IN NOISE UNDER FOCUSED ATTENTION
EFFECTIVE ATTENUATION OF SIGNALS IN NOISE UNDER FOCUSED ATTENTION
复制标题
DOI：
10.1121/1.400721
复制
发表时间：
1991-06-01
影响因子：
2.4
通讯作者：
BUUS, S
中科院分区：
文献类型：
--
作者：
DAI, HP;SCHARF, B;BUUS, S
当注意到一个给定频率的音调时，听众对该音调和周围有限频带内的其他音调最敏感。这个增强敏感度的区域定义了注意力带，该注意力带在两个实验中使用格林伯格和拉金的探针信号方法的修改版本进行测量[J. Acoust.美国社会44，1513-1523（1968）]。 实验1表明，在五个中心频率，从0.25到4.0 kHz，注意带的形状类似于由其他研究人员从陷波噪声掩蔽实验推断的听觉滤波器。 注意力带的宽度在较高频率下接近临界带，但在0.25和0.5 kHz下只有一半宽。 实验2产生的心理测量功能，无人值守的探测音至少0.23 kHz远离一个完全出席，1 kHz的目标音。 根据这些函数，有效衰减（测量为1 kHz目标和探头之间的阈值差）估计为7 dB;无论探头频率距离关注频带多远，衰减量似乎都大致相同。 对这些结果的一种解释是，以无人值守音调为中心的频带以一些小但可测量的权重对决策过程做出贡献，并且没有完全被忽略。
When attending to a tone at a given frequency, listeners are most sensitive to that tone and others within a restricted band of frequencies surrounding it. This region of enhanced sensitivity defines the attention band that was measured in two experiments using a modified version of the probe-signal method of Greenberg and Larkin [J. Acoust. Soc. Am. 44, 1513-1523 (1968)]. Experiment 1 showed that at five center frequencies, from 0.25 to 4.0 kHz, the shape of the attention band resembles that of the auditory filter as inferred from notched-noise masking experiments by other investigators. The width of the attention band is close to the critical band at higher frequencies, but only half as wide at 0.25 and 0.5 kHz. Experiment 2 produced psychometric functions for unattended probe tones at least 0.23 kHz away from a fully attended, 1-kHz target tone. From these functions, the effective attenuation, measured as the threshold difference between the 1-kHz target and the probes, was estimated to be 7 dB; the amount of attenuation appeared to be about the same regardless of how far the probe frequency was from the attended band. One interpretation of these results is that bands centered on the unattended tones contribute to the decision process with some small but measurable weight and are not entirely ignored.