窄带噪声的调频也和纯音调频一样,能诱发豚鼠的皮层慢反应。反应的阈值(最小调频深度)即可作为对窄带噪声的音调辨别阈(△f)。豚鼠的△f与噪声通带的宽度B及中心频率f有关,△f与B的关系可表达为△f=AB~n。式中A为B=1Hz时的△f值,它与纯音的△f相近并随f而变;在f为1kHz及4kHz时n近似地为1/3。当f在125—8000Hz范围内、B/f比值不变时,△f/f基本上为一常数。这是在频率辨别研究领域内Weber定律的很好示例。△f-f-B三者的总关系在豚鼠可简单地用经验式△f=0.1f~(2/3)B~(1/3)表达。用此式算得的△f值与实验结果相当接近。 Narrow-band noise FM and pure tone FM, can induce guinea pig cortical slow response. The threshold of the reaction (minimum FM depth) can be used as the pitch discrimination threshold (? F) for narrow band noise. The △ f of guinea pigs is related to the width B of the noise passband and the center frequency f. The relationship between △ f and B can be expressed as △ f = AB ~ n. Where A is the value of Δf at B = 1Hz, which is similar to Δf of pure tone and varies with f; and n is approximately 1/3 at f = 1kHz and 4kHz. When f is in the range of 125-8000 Hz and B / f ratio is constant, Δf / f is basically a constant. This is a good example of Weber’s law in the field of frequency discrimination. △ f-f-B total relationship between the three in guinea pigs can simply use the empirical formula △ f = 0.1f ~ (2/3) B ~ (1/3) expression. △ f values ​​calculated with this formula and the experimental results quite close.