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Responses of single midbrain auditory units in the frog to amplitude changes in long pure tones. I. Amplitude modulated segments



Responses of single midbrain auditory units in the frog to amplitude changes in long pure tones. I. Amplitude modulated segments



Sensornye Sistemy 13(2): 127-136



The responses of 72 single units located in the torus semicircularis of curarized grass frog (Rana temporaria) were studied. Long characteristic frequency pure tones at the level 20-50 dB above a threshold sounded continuously at the contralateral ear of the animal. Amplitude modulated (AM) segments with a duration of 600 ms and the rate of 0.5/sec were used as a signal. The modulation waveform was a 20 Hz sine function with an initial phase of 180degree. The modulation depth was changed in the range of 5-80%. The responses to such AM segments were compared with the responses of the same units to pure and AM tome bursts of the same duration as well as to long AM tones. The long-term adaptation effect was clearly evident when an AM segment was embedded in a long pure tone. The majority of phasic (onset) units responded to the first period of modulation but only a few of them could reproduce the following amplitude changes. The majority of units with a sustained response to tone bursts ceased their firing after 10-15th sec of the pure tone duration. The response to AM segments in such adapted condition was correlated with the response to AM tone bursts. The units without a synchronized response to 10% AM tone bursts usually could not reproduce the envelope of AM segments, though several remarkable exceptions were observed. Units demonstrated a considerable enhancement of synchronization with stimulus envelope during the first 0.2-0.6 s of AM tone bursts (Bibikov, Nizamov, 1996) were the best responders to AM segments in continuous tone. These units evoked strong response which was perfectly synchronized to the stimulus envelope during the whole duration of AM segment.

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