Abstract：
:Single-unit recordings from neurons in the torus semicircularis of Rana ridibunda were analyzed to determine the degree to which these neurons can detect acoustic stimuli superimposed on continuous, broad-band noise. In the first series of trials the stimuli were tone pulses 25 ms long, 5 dB above threshold, and at the characteristic frequency of the neuron. Most cells responded to the stimulus for signal-to-noise ratios of 25-35 dB (tone intensity minus spectral noise density); the lowest values were about 20 dB. The same signal-to-noise ratio was obtained with tones 20 dB above threshold. In the second series, conspecific mating calls at an intensity of 60 dB were tested. Here the signal-to-noise ratio (peak intensity of the call minus noise level) was usually 45-60 dB, in 5 of 27 cells it was 40 dB. Increasing the call intensity to 80 dB raised the SNR by an average of 6 dB. Noise-tolerant units more commonly gave synchronous responses to the pulse groups in the call, and are better tuned to its frequency range, than noise-sensitive units.
journal_name
Hear Resjournal_title
Hearing researchauthors
Joermann Gdoi
10.1016/0378-5955(88)90117-7subject
Has Abstractpub_date
1988-09-15 00:00:00pages
191-9issue
2-3eissn
0378-5955issn
1878-5891pii
0378-5955(88)90117-7journal_volume
35pub_type
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