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Dev Psychobiol. 1978 Jul;11(4):321-8. doi: 10.1002/dev.420110405.
Exploration, measured by head-dipping in a holeboard, was tested in male rats at 16, 21, 28, 56, and 84 days of age. Head-dipping increased with increasing age from Day 16 to Day 84, and so did the number of rears made. At all ages handled rats showed more head-dipping and made more rears than did their unhandled litter-mates. The age differences in exploration cannot be explained by different patterns of habituation: rats showed significant within-session habituation of head-dipping at all ages tested (Days 16, 21, and 28). Day 16 rats also showed significant between-session habituation.
通过在洞板中探头次数来衡量的探索行为，在16日龄、21日龄、28日龄、56日龄和84日龄的雄性大鼠中进行了测试。从第16天到第84天，探头次数随着年龄的增长而增加，直立次数也同样如此。在所有年龄段，与未处理的同窝幼崽相比，经过处理的大鼠表现出更多的探头次数和直立次数。探索行为的年龄差异不能用不同的习惯化模式来解释：在所有测试年龄（第16天、21天和28天）的大鼠中，探头次数在实验过程中都表现出显著的习惯化。第16天的大鼠在不同实验阶段之间也表现出显著的习惯化。
