Matched transfer characteristics of single units in a compound slit sense organ

摘要: The transfer characteristics of the lyriform slit sense organ HS8 on leg tibia ofCupiennius salei Keys. (Fig. 1) were investigated by electrophysiological experiments. is made up 7 slits. It was stimulated deflecting metatarsus toward fixed tibia. responses constituent slits recorded individually. 1. The step 2nd to 4th can be described bypower functions (t−k), where (t) time and (k) a constant between 0 1 (Figs. 6, 8). This means that sensilla take position frequency independent system (displacement receptor) first order differentiator (velocity receptor). standard deviations receptor coincide intra-individually inter-individually 5). 2. Thelinearity demonstrated using second as an example: a) The responds proportionally amplitudes from 0.1° 0.4°; varies only slightly 0.32 0.38 6). b) For stimulus frequencies 0.01 Hz 8 calculated response those estimated sinewave stimulation match well 7). c) For 100 number spikes/stimulus nearly same, no matter whether or measured stimuli 12). 3. Comparing results for 3 (of total 7) following conclusions are drawn: a) Thehigh-pass characteristic (exponentk) increases slit, while relative gain decreases 8). b) Thebandwidth according decreasing sensitivity 2 4, since maximal stimulating which encoded unequivocally (three spikes/stimulating sinewave) less than 20–30 all 12). c) Thefrequency-dependent threshold curves confirm functions. For thresholds ca. 0.025°, 0.25° 1.25° (deflection metatarsus), at 0.01°, 0.05° 0.125° (extrapolated). From tuning different “resonant frequencies” seen 11, 12). d) The (input amplitude vs. output-spike frequency) show overlap ranges respond; their linear parts, however, linked up. in extension both effective range precise detection changes. upper lower limits parts depend 9, 10, 14, Eq. 6). 7. The consisting part with high-pass character plus nonlinear rectifying threshold. precedes one 15, 16).