Sosnoff Jacob J, Newell Karl M
Department of Kinesiology and Community Health and Beckman Institute of Advanced Science and Technology, University of Illinois at Urbana-Champaign, USA.
Exp Aging Res. 2011 Jul;37(4):377-97. doi: 10.1080/0361073X.2011.590754.
Experimental tests of the neural noise hypothesis of aging, which holds that aging-related increments in motor variability are due to increases in white noise in the perceptual-motor system, were conducted. Young (20-29 years old) and old (60-69 and 70-79 years old) adults performed several perceptual-motor tasks. Older adults were progressively more variable in their performance outcome, but there was no age-related difference in white noise in the motor output. Older adults had a greater frequency-dependent structure in their motor variability that was associated with performance decrements. The findings challenge the main tenet of the neural noise hypothesis of aging in that the increased variability of older adults was due to a decreased ability to adapt to the constraints of the task rather than an increment of neural noise per se.
对衰老的神经噪声假说进行了实验测试，该假说认为与衰老相关的运动变异性增加是由于感知运动系统中白噪声的增加。年轻成年人（20 - 29岁）和老年成年人（60 - 69岁以及70 - 79岁）完成了多项感知运动任务。老年成年人在其表现结果上的变异性逐渐增大，但运动输出中的白噪声不存在与年龄相关的差异。老年成年人在其运动变异性方面具有更大的频率依赖性结构，这与表现下降相关。这些发现挑战了衰老的神经噪声假说的主要原则，即老年人变异性增加是由于适应任务约束的能力下降，而非神经噪声本身的增加。
