Cavonius C R, Estévez O, van der Tweel L H
Abteilung Sinnes- und Neurophysiologie, Institut für Arbeitsphysiologie, Dortmund, Germany.
Ophthalmic Physiol Opt. 1992 Apr;12(2):153-6. doi: 10.1111/j.1475-1313.1992.tb00279.x.
If a patternless field is modulated sinusoidally in time so that the luminance change in one eye is in counterphase to that in the other, the resulting flicker appears faster than if the modulation to both eyes has the same phase. If observers set the frequency and the amplitude of a comparison in-phase field so that it matches a neighbouring counterphase field, modulated at, say, 2.5 x its threshold, they set the frequency to twice the counterphase frequency, and the amplitude to a value that is, for a given frequency, a constant ratio of the modulation of the counterphase field. Counterphase stimulation thus appears to cause an internal second-harmonic signal. However, it is not possible to cancel this by adding a second harmonic component to the stimulus.
如果一个无图案的视场在时间上以正弦方式调制，使得一只眼睛中的亮度变化与另一只眼睛中的亮度变化相位相反，那么所产生的闪烁看起来比两只眼睛的调制具有相同相位时更快。如果观察者设置一个同相比较视场的频率和幅度，使其与一个相邻的反相视场相匹配，例如，该反相视场以其阈值的2.5倍进行调制，那么他们会将频率设置为反相频率的两倍，并且将幅度设置为对于给定频率而言，是反相视场调制的一个恒定比例的值。因此，反相刺激似乎会引起一个内部二次谐波信号。然而，不可能通过向刺激中添加二次谐波分量来消除这一信号。
