Center for Lifespan Psychology, Max Planck Institute for Human Development, Berlin, Germany.
Psychophysiology. 2013 Jan;50(1):111-23. doi: 10.1111/j.1469-8986.2012.01476.x. Epub 2012 Oct 30.
The reliability, stability, and signal-to-noise ratio (SNR) of event-related potentials (ERPs) were investigated in children, adolescents, younger adults, and older adults in performance monitoring tasks. P2, N2, P3, and P2-N2 peak-to-peak amplitude showed high odd-even split reliabilities in all age groups, ranging from.70 to.90. Multigroup analyses showed that test-retest stabilities (across 2 weeks) of ERP amplitudes did not differ among the four age groups. In contrast, relative to adolescents and younger adults, SNRs were lower in children and older adults, with higher noise levels in children and lower signal power in older adults. We conclude that age differences in the SNR of stimulus-locked ERPs can be successfully compensated by the averaging procedure with about 40 trials in the average. However, age differences in baseline noise and split-half reliability should be considered when comparing age groups in single trial measures or time-varying processes with ERPs.
在执行监测任务时，研究了儿童、青少年、年轻成年人和老年人的事件相关电位 (ERP) 的可靠性、稳定性和信噪比 (SNR)。P2、N2、P3 和 P2-N2 峰间峰值幅度在所有年龄组中均表现出高奇偶分裂可靠性，范围从 0.70 到 0.90。多组分析表明，ERP 幅度的测试-重测稳定性（在 2 周内）在四个年龄组之间没有差异。相比之下，与青少年和年轻成年人相比，儿童的 SNR 较低，而老年人的噪声水平较高，信号功率较低。我们得出结论，在平均约 40 次试验的平均过程中，刺激锁定 ERP 的 SNR 中的年龄差异可以通过平均程序成功补偿。但是，在使用 ERP 进行单次试验测量或时变过程比较年龄组时，应考虑基线噪声和分半可靠性的年龄差异。
