Vanderschuren L J, Niesink R J, Spruijt B M, Van Ree J M
Department of Medical Pharmacology, Rudolf Magnus Institute for Neurosciences, Faculty of Medicine, Utrecht University, The Netherlands.
Physiol Behav. 1995 Jul;58(1):119-23. doi: 10.1016/0031-9384(94)00385-i.
The effects of light level and familiarity to the testing environment on social behaviors related and unrelated to play were investigated in juvenile rats accustomed to dim light conditions. Pinning, a measure characteristic for social play in rats, was completely suppressed under intense light conditions. Following/chasing and boxing/wrestling, social behaviors related to play, were also decreased under intense light. Of the measures of social behavior not related to play, contact behavior was decreased under intense light whereas social exploration was hardly affected. Levels of social exploration and following/chasing gradually declined during the 15-min test period. Frequency of contact behavior decreased, whereas duration increased with time. Under dim light conditions, unfamiliarity to the test cage suppressed pinning and boxing/wrestling but not the other social behaviors in the first part of the test period. These findings show that social behavior in juvenile rats, as in adult rats, can be influenced by light level and familiarity to the test cage. Social behaviors related and unrelated to play seem to be differentially influenced by environmental stimuli.
在习惯于昏暗光照条件的幼年大鼠中，研究了光照强度和对测试环境的熟悉程度对与玩耍相关及无关的社会行为的影响。“按压”是大鼠社会玩耍的一项特征性指标，在强光条件下完全受到抑制。“跟随/追逐”和“拳击/摔跤”这两种与玩耍相关的社会行为在强光下也有所减少。在与玩耍无关的社会行为指标中，接触行为在强光下减少，而社会探索几乎不受影响。在15分钟的测试期内，社会探索和“跟随/追逐”的水平逐渐下降。接触行为的频率降低，而持续时间随时间增加。在昏暗光照条件下，对测试笼的不熟悉在测试期的第一部分抑制了“按压”和“拳击/摔跤”，但不影响其他社会行为。这些发现表明，幼年大鼠的社会行为与成年大鼠一样，会受到光照强度和对测试笼熟悉程度的影响。与玩耍相关及无关的社会行为似乎受到环境刺激的不同影响。
