Takeuchi T, Sitizyo K, Harada E
Department of Veterinary Physiology, Faculty of Agriculture, Tottori University, Japan.
Am J Vet Res. 1998 Jun;59(6):777-81.
To determine postnatal maturation of findings in the electroencephalogram (EEG) of calves and estimate the degree of electrophysiologic activity, using power spectrum and cross-correlation analyses of the EEG.
10 clinically normal Japanese Black calves ranging in age from 1 to 10 weeks.
EEG were recorded at various stages of consciousness. Power spectrum and cross-correlation analyses were applied to a relaxed state EEG.
After the second week of age, rhythmic waves with frequencies of 6 to 9 Hz (alpha rhythm-like pattern) appeared in the EEG during the relaxed state, and were recorded in the occipital and vertex areas; duration of appearance was < 30 seconds. By use of power spectrum analysis, power distribution of the 7.5- to 10-Hz frequency band in the occipital area significantly increased after the sixth week. The highest frequency (18 to 30 Hz) band increased in the frontal and occipital areas after the seventh week. Normalized cross-correlation coefficients at 0 time shift were > 0.6 throughout the experimental period. The normalized cross-correlation coefficients obtained from caudal interhemispheric sites increased after the second week, and were significantly greater than those in rostral sites.
Developmental changes in the EEG of calves during the first 10 weeks could be characterized by appearance of the alpha rhythm-like pattern and increase of the power distributions of the 7.5- to 10-Hz and 18- to 30-Hz frequency bands, which might be a useful indicator for estimating brain activity in young calves and as standard data for evaluating abnormal brain activity in calves.
通过对脑电图（EEG）进行功率谱分析和互相关分析，确定犊牛脑电图结果的产后成熟情况，并估计电生理活动程度。
10头临床健康的日本黑犊牛，年龄在1至10周之间。
在不同意识阶段记录脑电图。对放松状态下的脑电图进行功率谱分析和互相关分析。
在出生后第二周后，放松状态下的脑电图中出现了频率为6至9赫兹的节律性波（类α节律模式），记录于枕叶和头顶区域；出现持续时间<30秒。通过功率谱分析，枕叶区域7.5至10赫兹频段的功率分布在第六周后显著增加。第七周后，额叶和枕叶区域最高频率（18至30赫兹）频段增加。在整个实验期间，零时移的归一化互相关系数>0.6。从尾侧半球间部位获得的归一化互相关系数在第二周后增加，且显著大于头侧部位的系数。
犊牛在出生后前10周脑电图的发育变化可表现为类α节律模式的出现以及7.5至10赫兹和18至30赫兹频段功率分布的增加，这可能是估计幼龄犊牛脑活动的有用指标，也可作为评估犊牛异常脑活动的标准数据。
