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The development of ultrasonic characterization of the biological tissue elasticity

LIU Zhongguo1，ZHANG Xiaojing2，LIU Boqiang1，LIU Changchun1，   

  1. 1. School of Control Science and Engineering,Shandong University,Jinan 250061,China;2. Shandong Hengxin Architecture Design Limited Company,Jinan 250100,China)
  • Received:2005-08-10 Revised:1900-01-01 Online:2006-06-24 Published:2006-06-24
  • Contact: LIU Zhongguo1，

Abstract: Influence of interstimulus interval (ISI) of two stimuli on visual evoked potential (VEP) of human was investigated in this research, when the human subjects were presented with a pair of flashes as stimuli. It was indicated that preceding visual stimulus inhibited the amplitude of the evoked potential of the succeeding visual stimulus. The inhibition was dependent on ISI of the two stimuli, and the shorter the ISI the stronger the inhibition would be. The evoked potential of the succeeding stimulus was inhibited completely by the preceding stimulus when the ISI was shorter than 250?ms. VEP of the succeeding stimulus emerges gradually and the amplitude of the VEP becomes larger with the ISI longer and longer than 250?ms. The prepulse inhibition reflects the neural refractory effect of brain in response to continuous stimuli. Prepulse inhibition phenomena suggest that the principle of time priority encoding and principle of time weighting encoding is followed in brain information processing. The research will be applied in brain function, in pathology and diagnosis of schizophrenia.

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