Stavros Kara A, Kiorpes Lynne
Center for Neural Science, New York University, Room 809, 4 Washington Place, NY 10003, USA.
Vision Res. 2008 May;48(11):1335-44. doi: 10.1016/j.visres.2008.01.031. Epub 2008 Apr 11.
We measured the developmental time course for temporal contrast sensitivity in macaque monkeys. The animals, aged 5 weeks to 4 years, detected an unpatterned field of light sinusoidally modulated over time at frequencies ranging from 1 to 40 Hz. Young infants showed reduced sensitivity for all frequencies, and a reduced range of detectable frequencies. Sensitivity to high and low frequencies developed at different rates, but the shape of the temporal contrast sensitivity function did not change significantly with age. Temporal contrast sensitivity matures earlier than spatial contrast sensitivity. The development of high, but not low, frequency sensitivity may be limited by maturation of the magnocellular pathway.
我们测量了猕猴颞叶对比敏感度的发育时间进程。这些动物年龄在5周至4岁之间，检测随时间呈正弦调制的无图案光场，频率范围为1至40赫兹。幼猴对所有频率的敏感度均降低，可检测频率范围也减小。对高频和低频的敏感度以不同速率发展，但颞叶对比敏感度函数的形状并未随年龄显著变化。颞叶对比敏感度比空间对比敏感度成熟得更早。高频而非低频敏感度的发展可能受大细胞通路成熟的限制。
