摘要
目的 对４０ 只家兔Ｐ３ａ 成分进行识别并对其特征进行研究。方法 按国际１０～２０ 系统在家兔颅骨内９ 个点安放电极，用听觉Ｏｄｄｂａｌｌ 刺激序列记录这些部位的波形，并对其进行分析，辨认Ｐ３００ 亚成分Ｐ３ａ’和Ｐ３ｂ’。结果 ２９ 只家兔Ｐ３ａ’与Ｐ３ｂ’同时存在，Ｐ３ａ’潜伏期（２７５ ．７ ±２２ ．６）ｍｓ，其余１１ 只家兔Ｐ３ａ’单独存在，Ｐ３ａ’潜伏期延迟为（３０１．３ ±１６ ．１）ｍｓ，Ｐ３ａ’波幅呈额－ 顶分布，由Ｆｚ 点的（３４ ．７ ±３．０）μＶ 逐渐降低至Ｐｚ 点的（１６．７ ±３ ．１）μＶ，在用概率为１５ ％ ，５０％ ，８５％ ，１００％ 的声音刺激时，其波幅呈概率依赖性，即概率越低，波幅越高，概率越高波幅越小。结论 家兔Ｐ３ａ’在头颅分布及概率依赖性方面与人类Ｐ３ａ 相符，因此，家兔Ｐ３ａ’与人类Ｐ３ａ 相似。
Objective To recognize the P3a component in rabbits and its character.Methods Electrodes attached to 9 sites on rabbit's skull according to the 10～20 systems of International standard.An Oddball paradigm stimulus was adopted to record the waveform at 9 sites of rabbit's skull.Then,the P3a and P3b component of P300 was analyzed and recognized.Results The P3a' and P3b' were existed in 29 rabbits simultaneously.The latency of P3a' was (275.7±22.6)ms.Of 11 rabbits with P3a' single existence,the latency delayed to (301.3±16.1)ms.The waveform amplitude of P3a was distributed in frontoparietal area,it was gradually and significantly decreased from Fz(34.7±3.0)μV to Pz point(16.7± 3.1)μV. Using the sound stimutus of 15%,50%,85%,100% probability,the wave amplitude presented dependence.The lower the probability,the higher the amplitude is.Conclusion According to above study,it is confirmed that the rabbit P3a' is similar to human P3a.
出处
《中华理疗杂志》
2000年第1期41-43,共3页
Chinese Journal of Physical Therapy
