Skoczenski Ann M, Norcia Anthony M
Eunice Kennedy Shriver Center, University of Massachusetts Medical School, Waltham 02452, USA.
Psychol Sci. 2002 Nov;13(6):537-41. doi: 10.1111/1467-9280.00494.
We used a visual evoked-potential measure to study the development of two components of pattern vision, vernier acuity and grating acuity, in humans from early infancy through adolescence. These two visual functions develop at similar rates and have nearly the same absolute values between 1 month and 6 years of age. After age 6, grating acuity is constant at the adult level, but vernier acuity continues to improve, becoming a hyperacuity. Vernier acuity reaches asymptotic levels around age 14 years. These results suggest that adultlike vernier hyperacuity is not limited by spatial resolution or sensitivity of small receptive fields, but rather that the limitation is imposed by higher-level processing. Sensitivity, connections in visual cortical areas, or both therefore retain plasticity throughout childhood and into adolescence.
我们采用视觉诱发电位测量方法，研究了从婴儿早期到青春期的人类模式视觉的两个组成部分——游标视力和光栅视力的发育情况。这两种视觉功能以相似的速度发展，在1个月至6岁之间具有几乎相同的绝对值。6岁以后，光栅视力保持在成人水平不变，但游标视力持续改善，成为一种超敏锐视力。游标视力在14岁左右达到渐近水平。这些结果表明，成人般的游标超敏锐视力不受小感受野的空间分辨率或敏感性的限制，而是由更高层次的处理施加限制。因此，敏感性、视觉皮层区域的连接或两者在整个童年期直至青春期都保持可塑性。
