Temporal integration functions of AM detection and AM depth discrimination
Temporal integration functions of AM detection and AM depth discrimination
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AM 检测和 AM 深度辨别的时间积分功能
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Changmo Jeung
中科院分区：
文献类型：
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作者：
Jungmee Lee;G. Long;Changmo Jeung
以前的研究（Lee，1994; Lee and Bacon，1997）表明AM频率和AM深度辨别力都受AM周期数的影响，而不是受刺激持续时间的影响。AM检测和AM深度歧视作为调制速率为10，20，40，80，125，160和320 Hz的AM周期数的函数进行测量。载波是宽带噪声（10 kHz低通），并且载波或者由调制器选通（选通载波）或者比调制器早250 ms和晚250 ms呈现（连续载波）。每种表现的总体水平在65 dB SPL的6-dB范围内随机化。对于较低的调制速率（10、20、40和80 Hz），与选通载波条件相比，连续载波在较少的周期数（两个和四个调制周期）下有显著的改善。然而，对于较高的调制速率（125、160和320 Hz），阈值不受载波类型的影响。这些结果表明，有…
Previous studies (Lee, 1994; Lee and Bacon, 1997) suggested that both AM rate and AM depth discrimination were influenced by the number of AM cycles, instead of by the duration of stimulus. AM detection and AM depth discrimination were measured as a function of the number of AM cycles for the modulation rates of 10, 20, 40, 80, 125, 160, and 320 Hz. The carrier was a broadband noise (10 kHz low pass), and the carrier was either gated with the modulator (gated carrier) or presented 250 ms earlier and 250 ms later than the modulator (continuous carrier). The overall level of each presentation was randomized within 6‐dB range from 65 dB SPL. For the lower modulation rates (10, 20, 40, and 80 Hz), there was a significant improvement with the continuous carrier at smaller number of cycles (two and four modulation cycles) as compared to the gated carrier condition. For the higher modulation rates (125, 160, and 320 Hz), however, the thresholds were not affected by carrier type. These results suggest that there ...