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Fig. 4. Effects of body temperature on tuning, sensitivity, latency and response
strength of auditory interneurons of the cicada T. josei. (A,B)
Tuning curves of two interneurons exhibiting shifts in their tuning and
sensitivity with body temperatures ranging from 16°C to 28°C. Maximum
effects are observed at temperatures from 16–18°C to 24°C in the
frequency range 3 to 8 kHz. At higher frequencies the characteristic frequency
remains constant, but some effect on sensitivity is still present. (C)
Sensitivity at the characteristic frequency of 20 recordings, of the 29 cells
listed in Table 1, which
exhibited an increased sensitivity with temperature. The lines connect the
sensitivities of each interneuron. (D) Dependence of latency on temperature,
obtained from 29 recordings of interneurons. Latencies were measured 20 dB
above threshold at the characteristic frequency and decreased with increasing
temperature. (E) Dependence of the number of action potentials on the
temperature in 29 recordings. At each temperature the number of action
potentials is an average of five stimulus presentations at the characteristic
frequency and 20 dB above threshold.
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