Alekseenko S V, Prazdnikova N V
Laboratory of Visual Physiology, I. P. Pavlov Institute of Physiology, St. Petersburg, Russia.
Neurosci Behav Physiol. 1998 Mar-Apr;28(2):198-200. doi: 10.1007/BF02461967.
Spatial contrast sensitivity was measured in kittens aged 6, 9, and 12 months and in adult cats. Cats had to open one of two small windows, which had a photograph of a grid, in order to obtain food reinforcement. The nonreinforced stimulus was a photograph of a uniform field of the same mean luminance. Visual acuity was constant in kittens aged 6 to 12 months. However, six-month-old kittens had low contrast sensitivity at low spatial frequencies (< 0.6 cycles/degree). At the age of nine months, contrast sensitivity over this range increased, though the level seen in adult cats was reached only at the age of 12 months. It is suggested that the increase in contrast sensitivity occurring after the critical developmental period in kittens reflects maturation of higher-order cortical fields involved in the process of recognition.
对6个月、9个月和12个月大的小猫以及成年猫进行了空间对比敏感度测量。猫必须打开两个小窗户中的一个（其中有一张网格照片）才能获得食物奖励。无奖励刺激是一张具有相同平均亮度的均匀视野照片。6至12个月大的小猫视力恒定。然而，6个月大的小猫在低空间频率（<0.6周/度）下对比敏感度较低。9个月大时，此范围内的对比敏感度有所增加，不过只有在12个月大时才达到成年猫的水平。有人认为，小猫关键发育期后对比敏感度的增加反映了参与识别过程的高阶皮质区域的成熟。
