Gary-Bobo E, Przybyslawski J, Saillour P
Institut des Neurosciences, Neurosciences de la Vision, UPMC-CNRS, Paris, France.
Neurosci Lett. 1995 Apr 21;189(3):147-50. doi: 10.1016/0304-3940(95)11477-e.
The development of contrast sensitivity to spatial and temporal frequencies was studied in the visual cortex of 6-week-old kittens reared from birth in three conditions: normal, dark-reared (DR) and dark-reared after 6 h of visual experience. Receptive fields of cells recorded in area 17 were quantitatively analysed using drifting sine-wave gratings. Compared to the low values obtained in the DR kittens, we observed after 6 h of visual experience: (1) an adult-like detection of higher spatial frequencies, (2) an increase of contrast sensitivity at low temporal frequencies; (3) a shift of the cell optimum towards 3 Hz, all values close to the normal ones. Unlike the spatial frequency selectivity, contrast sensitivity and detection of higher temporal frequencies continue to develop with age and visual experience.
研究了在三种条件下从出生起饲养的6周龄小猫视觉皮层中对空间和时间频率的对比敏感度的发展情况：正常饲养、黑暗饲养（DR）以及在有6小时视觉经验后进行黑暗饲养。使用漂移正弦波光栅对在17区记录的细胞感受野进行了定量分析。与DR小猫获得的低值相比，在6小时视觉经验后我们观察到：（1）对较高空间频率的类似成年猫的检测能力；（2）在低时间频率下对比敏感度的增加；（3）细胞最佳频率向3Hz的偏移，所有值都接近正常值。与空间频率选择性不同，对比敏感度和对较高时间频率的检测能力会随着年龄和视觉经验的增加而持续发展。
