Tal'nov A M
Fiziol Zh (1994). 2010;56(5):23-33.
The hippocampal theta rhythm was studied during an adaptive behaviour elaboration (a receiving of drinking reward in response on a specific audio stimulus) in freely moving water deprived rats. It was revealed that a right behavioral response (a drinking tank visit) in conditions of discrimination of two sound stimuli emerged only in case of the theta rhythm frequency increase in response on the positive conditional stimulus. Although this increase occurred only in response to positive signal it was also linked with the differentiation process--the theta rhythm frequency increase became significant when animals started to recognize positive and negative conditional stimuli. The detailed analysis revealed the detected theta rhythm frequency increase consisted of two waves. One of them was connected with the positive conditional stimulus presentation moment. The other one was connected with the time of appearance and duration of movement to drinking tank after positive conditional stimulus presentation (right behavioral answers) as well as after negative conditional stimulus (wrong answers). At the same time the frequency was significantly higher during right behavioral answers comparing with wrong ones. It is concluded that the theta rhythm frequency increased during the sensory information analysis when it was needed to choose a signal leading to reinforcement and to exit from the state of the internal inhibition. On the other hand the frequency increased during the purposive movements.
在自由活动的缺水大鼠进行适应性行为细化（对特定音频刺激做出反应以获得饮水奖励）的过程中，对海马θ节律进行了研究。结果显示，在区分两种声音刺激的条件下，只有当对阳性条件刺激做出反应时θ节律频率增加，才会出现正确的行为反应（前往饮水槽）。虽然这种增加仅在对阳性信号做出反应时发生，但它也与分化过程有关——当动物开始识别阳性和阴性条件刺激时，θ节律频率的增加变得显著。详细分析表明，检测到的θ节律频率增加由两个波组成。其中一个与阳性条件刺激呈现时刻有关。另一个与阳性条件刺激呈现后（正确行为反应）以及阴性条件刺激后（错误反应）前往饮水槽的动作出现时间和持续时间有关。同时，正确行为反应期间的频率明显高于错误反应期间。得出的结论是，在需要选择导致强化的信号并从内抑制状态中退出时，感觉信息分析期间θ节律频率增加。另一方面，在有目的的运动期间频率增加。
