Demany Laurent, Trost Wiebke, Serman Maja, Semal Catherine
Université Bordeaux 2 , Bordeaux, France.
Psychol Sci. 2008 Jan;19(1):85-91. doi: 10.1111/j.1467-9280.2008.02050.x.
Previous research has shown that the detectability of a local change in a visual image is essentially independent of the complexity of the image when the interstimulus interval (ISI) is very short, but is limited by a low-capacity memory system when the ISI exceeds 100 ms. In the study reported here, listeners made same/different judgments on pairs of successive "chords" (sums of pure tones with random frequencies). The change to be detected was always a frequency shift in one of the tones, and which tone would change was unpredictable. Performance worsened as the number of tones increased, but this effect was not larger for 2-s ISIs than for 0-ms ISIs. Similar results were obtained when a chord was followed by a single tone that had to be judged as higher or lower than the closest component of the chord. Overall, our data suggest that change detection is based on different mechanisms in audition and vision.
先前的研究表明，当刺激间隔（ISI）非常短时，视觉图像中局部变化的可检测性基本上与图像的复杂性无关，但当ISI超过100毫秒时，它会受到低容量记忆系统的限制。在本文报道的研究中，听众对连续的“和弦”（随机频率纯音之和）对进行相同/不同判断。要检测的变化总是其中一个音调的频率偏移，并且哪个音调会变化是不可预测的。随着音调数量的增加，表现会变差，但这种影响在2秒的ISI下并不比在0毫秒的ISI下更大。当一个和弦后面跟着一个必须判断为高于或低于和弦最接近成分的单音时，也得到了类似的结果。总体而言，我们的数据表明，变化检测在听觉和视觉中基于不同的机制。
