The aim of this study is to investigate neuronal ensemble coding mechanism via entropy under fear conditioning. Entropy is a measurement of uncertainty and the amount of information in a sequence, which can quanta information as well as describe the ensemble coding characteristic. The original data were recorded at anterior cingulate cortex (ACC) of rats by implicated 16 channels array under two conditions: pre-training and testing. Then through a high pass filtering (300Hz-7.5KHz) and spike detection, spike trains were obtained via spike sorting. The entropy values were performed in a selected window (500ms) with a moving step (size of 1/4window). The results showed that the entropy values were lower in pre-training with no ensemble activity; in testing condition, the entropy values were higher, where presented obvious ensemble activity. Conclusion: in pre-training, no ensemble activity was presented, which indicated that memory was not formed; in testing condition, obvious ensemble activity was manifested, which showed that the fear memory has been built up. The effect on coding firing information of neuronal ensemble by dynamic entropy coding was proved.
收起[1]Tianjin Med Univ, Res Ctr Basic Med, Tianjin 300070, Peoples R China.
[2]Fudan Univ, Inst Neurobiol, Shanghai 200032, Peoples R China.
(8.0+极速模式)