Department of Psychology.
J Exp Psychol Hum Percept Perform. 2014 Apr;40(2):685-701. doi: 10.1037/a0034720. Epub 2013 Nov 4.
This study determined whether facilitation of auditory stream segregation could occur when facilitating context tones are accompanied by other sounds. Facilitation was measured as the likelihood of a repeated context tone that could match the low (A) or high (B) frequency of a repeating ABA test to increase the likelihood of hearing the test as segregated. We observed this type of facilitation when matching tones were alone, or with simultaneous bandpass noises or continuous speech, neither of which masked the tones. However, participants showed no streaming facilitation when a harmonic complex masked the context tones. Mistuning or desynchronizing the context tone relative to the rest of the complex did not facilitate streaming, despite the fact that the context tone was accessible to awareness and attention. Even presenting the context tone in a separate ear from the rest of the harmonic complex did not facilitate streaming, ruling out peripheral interference. Presenting the test as mistuned or desynchronized tones relative to complex tones eliminated the possibility that timbre changes from context to test interfered with facilitation resulting from the context. These results demonstrate the fragility of streaming facilitation and show that awareness of and attention to the context tones are not sufficient to overcome interference.
本研究旨在确定在促进语境音的同时伴随其他声音是否会促进听觉流分离。促进作用通过以下方式来衡量：重复的语境音与重复的 ABA 测试的低（A）或高（B）频率匹配的可能性增加了听觉分离的可能性。当匹配的音调单独存在，或与同时的带通噪声或连续语音一起存在时，我们观察到了这种促进作用，因为这些声音都没有掩盖音调。然而，当谐波复合音掩蔽语境音时，参与者没有表现出流分离促进作用。即使语境音与复合音的其他部分失谐或不同步，也不会促进流分离，尽管语境音可以被感知和注意到。即使将语境音与其他谐波复合音分开呈现，也不会促进流分离，排除了外围干扰的可能性。相对于复合音呈现失谐或不同步的测试音消除了由于语境到测试的音高变化干扰促进作用的可能性。这些结果表明流分离促进作用的脆弱性，并表明对语境音的感知和注意力不足以克服干扰。
