title: [Sound level of conditioned stimulus differs the plasticity of characteristic frequency in the rat cortical neurons].
abstract: OBJECTIVE
  Try to observe the plasticity of neuron in primary cortex of rat evoked by conditioned stimulus of different sound level.
  
  
  METHODS
  Applying conventional electrophysiological technique of extracellular recording to investigate the plasticity of characteristic frequency (CF) and frequency turning curve (FIC) of neurons in rat auditory cortex (AC) by determining CF shifts of neurons caused by sound stimulus of different sound level.
  
  
  RESULTS
  When the frequency difference between conditioned stimulus (CS) frequency and the CF of neuron was in 1.0 kHz, the plasticity of CF induced by CS was associated with sound level. The probability of the plasticity of CF evoked by CS of higher sound lever was more than the lower. And the probability was dependent on frequency turning curve (FTC) and almost independent on the sound level of conditioned signal.
  
  
  CONCLUSIONS
  Sound level of conditioned stimulus differs the plasticity of characteristic frequency of neurons in rat auditory cortex.
authors.affiliation: Shanghai Vocational and Technical College of Agriculture and Forestry, Shanghai 201600, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Xin-de
authors.initials: XD
authors.lastname: Sun
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001303:Auditory Cortex / Q000166:cytology*; D001307:Auditory Perception / Q000502:physiology; D003214:Conditioning, Classical / Q000502:physiology*; D005260:Female; D008297:Male; D009473:Neuronal Plasticity / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D010470:Perceptual Masking; D051381:Rats; D017207:Rats, Sprague-Dawley; D013016:Sound