Stecker G Christopher, Hafter Ervin R
Department of Speech and Hearing Sciences, University of Washington, Seattle, Washington 98105, USA.
J Acoust Soc Am. 2009 Jun;125(6):3914-24. doi: 10.1121/1.3124776.
In a free-field pointing task, listeners localized trains of 4-32 spatially distributed Gabor clicks (narrowband impulses) centered at 4-kHz carrier frequency and repeating at an interval of 5 ms. Multiple regression coefficients estimated the perceptual "weight" applied to each click in a train during location judgments. Temporal weighting functions obtained in this way exhibited two key features: onset dominance, as evidenced by high weight on the initial click, and "upweighting" of late-arriving sound, as evidenced by weights that gradually increased over the duration of each click-train. Across all tested click-train durations, and despite randomly varying the durations from trial to trial, the greatest post-onset weights were consistently found for clicks at or near the offset. The results imply a special importance of late-arriving sound rather than feedforward recovery from onset dominance, and are broadly consistent with recency effects resulting from temporal integration.
在自由场指向任务中，听众对以4千赫载波频率为中心、间隔5毫秒重复出现的4至32个空间分布的伽柏点击声（窄带脉冲）进行定位。多元回归系数估计了在位置判断过程中应用于一串点击声中每个点击声的感知“权重”。通过这种方式获得的时间加权函数呈现出两个关键特征：起始优势，表现为对初始点击声赋予高权重；以及对延迟到达声音的“权重增加”，表现为权重在每个点击声序列的持续时间内逐渐增加。在所有测试的点击声序列持续时间内，尽管每次试验的持续时间随机变化，但始终发现偏移处或其附近的点击声在起始后具有最大权重。结果表明延迟到达声音具有特殊重要性而非起始优势的前馈恢复，并且与时间整合产生的近因效应大致一致。
