Takeuchi T, Suzuki M, Sitizyo K, Saito T
Department of Veterinary Physiology, Faculty of Agriculture, Tottori University, Japan.
Nihon Seirigaku Zasshi. 1993;55(11):445-55.
Developmental EEG examination was performed in ten Japanese Black calves aged from 1 week to 10 weeks. The EEG was markedly influenced by the level of consciousness. In the alert wakefulness, the EEG was high frequency, low voltage pattern. In the wakefulness, the dominant activity was low frequency, and low voltage, high frequency activity was superimposed. In the drowsiness, the EEG was high voltage, low frequency activity pattern. In the sleep, markedly high voltage, low frequency activity was dominant. These four EEG patterns observed from the 1st week to the 10th week. During the course of the examination, high frequency, low voltage activity increased, so the EEG pattern gradually developed to the 10th week of age. In the wakefulness, theta wave and alpha wave dominant pattern was observed in seven calves. This pattern was observed after the 2nd week of age, thereafter incidence of this pattern increased to the 5th or 6th week. The frequency of theta wave and alpha wave dominant pattern increased from 6.0-7.5 Hz at the 3rd week to 7.5-9.0 Hz at the 10th week. As described above, the development of the central nervous system has attained the considerable level in the newborn calves, and thereafter continue to develop.
对10头1周龄至10周龄的日本黑毛犊牛进行了发育性脑电图检查。脑电图受意识水平的影响显著。在警觉清醒状态下，脑电图为高频、低电压模式。在清醒状态下，主要活动为低频，且叠加有低电压、高频活动。在困倦状态下，脑电图为高电压、低频活动模式。在睡眠中，明显的高电压、低频活动占主导。从第1周龄至第10周龄观察到这四种脑电图模式。在检查过程中，高频、低电压活动增加，因此脑电图模式在10周龄时逐渐发展。在清醒状态下，7头犊牛观察到θ波和α波主导模式。这种模式在2周龄后出现，此后该模式的发生率在第5周或第6周增加。θ波和α波主导模式的频率从第3周的6.0 - 7.5赫兹增加到第10周的7.5 - 9.0赫兹。如上所述，新生犊牛的中枢神经系统发育已达到相当水平，此后继续发育。
