Maturation of EEG power spectra in early adolescence: a longitudinal study
Maturation of EEG power spectra in early adolescence: a longitudinal study
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DOI：
10.1111/j.1467-7687.2010.01031.x
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发表时间：
2011-09-01
影响因子：
3.7
通讯作者：
Paus, Tomas
中科院分区：
文献类型：
--
作者：
Cragg, Lucy;Kovacevic, Natasa;Paus, Tomas
这项研究调查了青春期早期脑电功率谱的细粒度发展，以及它在峰值频率变化中的反映程度。它还试图确定脑电功率谱中的性别差异是否反映了不同的成熟模式。一组56名青少年在10岁时接受了测试，然后在两个相隔大约18个月的时间点进行了测试。EEG在闭眼和睁眼两种情况下都被记录下来，并进行傅立叶变换，以提供在0.5至40赫兹的0.5赫兹间隔内的绝对和相对频谱功率的估计。每个个体在每个时间点的峰值阿尔法频率也被确定为相对光谱功率。偏最小二乘法(偏最小二乘法)用于确定显示发育变化或性别差异的电极和频率的组合。作为年龄的函数，绝对增量和θ频率功率降低，相对α2和β频率增加，重复了低频率随年龄减少，高频率随年龄增加的标准发现。随着年龄的增长，阿尔法峰值频率略有增加，但显著增加。此外，对个体阿尔法频率与10赫兹对齐进行的偏最小二乘分析表明，阿尔法2相对功率随年龄的增加是由峰值频率的变化驱动的。尽管男性比女性表现出更高的阿尔法能力，但峰值频率没有性别差异，这表明脑电功率的性别差异可能不仅仅是两性成熟速度的不同。
This study investigated the fine-grained development of the EEG power spectra in early adolescence, and the extent to which it is reflected in changes in peak frequency. It also sought to determine whether sex differences in the EEG power spectra reflect differential patterns of maturation. A group of 56 adolescents were tested at age 10 years and then at two further time-points approximately 18 months apart. The EEG was recorded during both eyes-closed and eyes-open conditions and Fourier transformed to provide estimates of absolute and relative spectral power at 0.5 Hz intervals from 0.5 to 40 Hz. The peak alpha frequency for each individual at each time-point was also determined for relative spectral power. Partial Least Squares (PLS) analysis was used to determine the combination of electrodes and frequencies that showed developmental change, or differed between the sexes. As a function of age, absolute delta and theta frequencies power decreased, and relative alpha2 and beta frequencies increased, replicating the standard findings of a decrease in lower, and increase in higher, frequencies with age. A small but significant increase in peak alpha frequency with age was detected. Moreover PLS analysis performed with individual alpha frequencies aligned to 10 Hz suggested that the age-related increase seen in alpha2 relative power was driven by changes in the peak frequency. Although males demonstrated higher alpha power than females, there were no sex differences in peak frequency, suggesting that there may be more to sex differences in EEG power than simply different rates of maturation between the two sexes.