Kelly Jack B, Cooke James E, Gilbride Patrick C, Mitchell Craig, Zhang Huiming
Laboratory of Sensory Neuroscience, Psychology Department, Carleton University, Ottawa, ON, Canada.
J Comp Psychol. 2006 May;120(2):98-105. doi: 10.1037/0735-7036.120.2.98.
Thresholds for detecting the presence of amplitude modulation in a noise carrier were determined for rats using conditioned avoidance procedures. There was a progressive increase in threshold with modulation rates between 5 Hz and 2 kHz. Further tests were conducted to determine difference thresholds for detecting an increase in modulation rate for standard rates of 10, 50, and 100 Hz. The size of the difference threshold increased progressively as the standard rate increased. In addition, thresholds for detecting an increase in the duration of a noise burst were determined for various standard durations. The difference thresholds were constant for values between 10 and 50 ms but increased progressively, with standard durations between 0.1 and 1.0 s.
利用条件性回避程序，为大鼠确定了检测噪声载波中调幅存在的阈值。在5赫兹至2千赫兹的调制率范围内，阈值逐渐增加。进行了进一步测试，以确定在10、50和100赫兹的标准率下检测调制率增加的差别阈限。随着标准率的增加，差别阈限的大小逐渐增大。此外，针对各种标准持续时间，确定了检测噪声猝发持续时间增加的阈值。在10至50毫秒之间，差别阈限是恒定的，但在0.1至1.0秒的标准持续时间内，差别阈限逐渐增加。
