A COMPARISON OF STEADY-STATE EVOKED-POTENTIALS TO MODULATED TONES IN AWAKE AND SLEEPING HUMANS
A COMPARISON OF STEADY-STATE EVOKED-POTENTIALS TO MODULATED TONES IN AWAKE AND SLEEPING HUMANS
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DOI：
10.1121/1.402050
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发表时间：
1991-11-01
影响因子：
2.4
通讯作者：
CLARK, GM
中科院分区：
文献类型：
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作者：
COHEN, LT;RICKARDS, FW;CLARK, GM
测量了双耳调幅（AM）和调幅/调频组合（AM/FM）音调的稳态诱发电位反应。对于清醒的受试者，调幅/调频音调比调幅音调产生更大的振幅反应。比较醒时和睡眠时对30db HL AM/FM音调的反应。睡眠时的反应幅度较低，与清醒时的反应幅度差异的程度取决于载波频率和调制频率。刺激调制频率下的背景脑电图噪声在睡眠期间也有所降低，并随调制频率的变化而变化。用检测效率函数表示最适合行为阈值电估计的调制频率。在清醒的受试者中，对于所有载波频率的测试，在45 Hz的调制频率下检测效率最高。在睡眠的受试者中，最高效率的调制频率区域随着载波频率的变化而变化。对于250 Hz， 500 Hz和1 kHz的载波频率，在45和90 Hz的两个调制频率区域中发现了最高的效率。对于2 kHz和4 kHz，效率最高的调制频率高于70 Hz。睡眠阶段对脑电信号的响应幅度和背景噪声的影响与调制频率有关。本研究结果表明，对于睡眠受试者，在使用稳态电位估计听力阈值时，调制频率高于70 Hz可能是最好的。
Steady-state evoked potential responses were measured to binaural amplitude-modulated (AM) and combined amplitude- and frequency-modulated (AM/FM) tones. For awake subjects, AM/FM tones produced larger amplitude responses than did AM tones. Awake and sleeping responses to 30-dB HL AM/FM tones were compared. Response amplitudes were lower during sleep and the extent to which they differed from awake amplitudes was dependent on both carrier and modulation frequencies. Background EEG noise at the stimulus modulation frequency was also reduced during sleep and varied with modulation frequency. A detection efficiency function was used to indicate the modulation frequencies likely to be most suitable for electrical estimation of behavioral threshold. In awake subjects, for all carrier frequencies tested, detection efficiency was highest at a modulation frequency of 45 Hz. In sleeping subjects, the modulation frequency regions of highest efficiency varied with carrier frequency. For carrier frequencies of 250 Hz, 500 Hz, and 1 kHz, the highest efficiencies were found in two modulation frequency regions centered on 45 and 90 Hz. For 2 and 4 kHz, the highest efficiencies were at modulation frequencies above 70 Hz. Sleep stage affected both response amplitude and background EEG noise in a manner that depended on modulation frequency. The results of this study suggest that, for sleeping subjects, modulation frequencies above 70 Hz may be best when using steady-state potentials for hearing threshold estimation.