POTENTIALS-EVOKED BY THE SINUSOIDAL MODULATION OF THE AMPLITUDE OR FREQUENCY OF A TONE
POTENTIALS-EVOKED BY THE SINUSOIDAL MODULATION OF THE AMPLITUDE OR FREQUENCY OF A TONE
复制标题
DOI：
10.1121/1.395560
复制
发表时间：
1987-07-01
影响因子：
2.4
通讯作者：
MAISTE, AC
中科院分区：
文献类型：
--
作者：
PICTON, TW;SKINNER, CR;MAISTE, AC
从人的头皮上记录了对音调振幅或频率的正弦调制的稳态响应。对于调幅（AM）和调频（FM），响应在30和50 Hz之间的调制频率是最一致的。然而，可靠的响应也可以记录在较低的频率，特别是在2-5赫兹的调幅和3-7赫兹的调频。在40 Hz下，随着调制深度的增加，调幅和调频响应的幅度都增加，但在较大的调制深度下，调幅响应趋于饱和。两种响应均显示出相位随调制深度变化的显著变化。随着载波频响强度的增加，调频响应的幅值增加，相位延迟减少，在高强度时调频响应的幅值出现一定的饱和。在接近检测调制的主观阈值的调制深度和接近听到刺激的主观阈值的强度时，可以记录这两种反应。反应是可变的，但在10分钟的时间内并没有一致地适应。40赫兹的调幅和调频响应似乎来自同一个发生器，这个发生器由检测振幅或频率变化的不同听觉系统激活。
Steady state responses to the sinusoidal modulation of the amplitude or frequency of a tone were recorded from the human scalp. For both amplitude modulation (AM) and frequency modulation (FM), the responses were most consistent at modulation frequencies between 30 and 50 Hz. However, reliable responses could also be recorded at lower frequencies, particularly at 2-5 Hz for AM and at 3-7 Hz for FM. With increasing modulation depth at 40 Hz, both the AM and FM response increased in amplitude, but the AM response tended to saturate at large modulation depths. Neither response showed any significant change in phase with changes in modulation depth. Both responses increased in amplitude and decreased in phase delay with increasing intensity of the carrier tone, the FM reponse showing some saturation of amplitude at high intensities. Both responses could be recorded at modulation depths close to the subjective threshold for detecting the modulation and at intensities close to the subjective threshold for hearing the stimulus. The responses were variable but did not consistently adapt over periods of 10 min. The 40-Hz AM and FM responses appear to originate in the same generator, this generator being activated by separate auditory systems that detect changes in either amplitude or frequency.