Response characteristics of a cold receptor in the stick insectCarausius morosus
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The cold cell in the easily identified ‘mound-shaped’ sensillum on the 12th segment ofCarausius morosus' antennae responds to downward temperature (T) steps from about 15 °C with a sharp rise in impulse frequency (F). Responses to similar steps from higher initial temperatures are smaller (Figs. 1, 3, 4). As initialT increases from 16 °C to 31 °C, differential sensitivity to downward steps falls off by a factor of 27: to yield an average increase inF of 1 imp/s, steps down from 31 °C must increase by 1.7 °C; steps down from 16 °C, by only 0.06 °C (Fig. 5). Resolving power forT-steps at mid-range initial temperatures is about 0.7 °C, i.e. the probability that a single cold cell at average differential sensitivity will correctly discriminate between twoT steps 0.7 °C apart is 90% when the cell is presented with each step just once.
The same cold cell also displays a clear dependence on steadyt between 14 °C and 24 °C (Figs. 7, 8). The static discharge rate of a single cell at average differential sensitivity has a resolving power of about 0.9 °C for steadyT. — The static discharge is not affected by the amount of water vapor in the stimulating air (Fig. 9).
KeywordsWater Vapor Discharge Rate Initial Temperature Response Characteristic Average Increase
impulse frequency in impulses per second (imp/s)
partial pressure of water vapor in torr
temperature in °C
step change inT
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- Altner H, Loftus R (1985) Ultrastructure and function of insect thermo- and hygroreceptors. Annu Rev Entomol 30:273–295Google Scholar
- Altner H, Tichy H, Altner I (1978) Folded outer dendritic segments of a sensory cell within a poreless thermo- and hygroreceptive sensillum of the insect,Carausius morosus. Cell Tissue Res 191:287–304Google Scholar
- Davis EE, Sokolove PG (1975) Temperature responses of antennal receptors of the mosquito,Aedes aegypti. J Comp Physiol 96:223–236Google Scholar
- Diem K, Lentner C (eds) (1968) Wissenschaftliche Tabellen, 7th edn. Ciba-Geigy, BaselGoogle Scholar
- Hess E, Loftus R (1984) Warm and cold receptors of two sensilla on the foreleg tarsi of the tropical bont tickAmblyomma variegatum. J Comp Physiol A 155:187–195Google Scholar
- Kürten L, Schmidt U, Schäfer K (1984) Warm and cold receptors in the nose of the vampire batDesmodus rotundus. Naturwissenschaften 71:327–328Google Scholar
- Loftus R (1968) The response of the antennal cold receptor ofPeriplaneta americana to rapid temperature changes and to steady temperature. Z Vergl Physiol 48:587–623Google Scholar
- Loftus R (1969) Differential thermal components in the response of the antennal cold receptor ofPeriplaneta americana to slowly changing temperature. Z Vergl Physiol 63:415–433Google Scholar
- Loftus R, Corbière-Tichané G (1981) Antennal warm and cold receptors of the cave beetle,Speophyes lucidulus Delar., in sensilla with a lamellated dendrite. J Comp Physiol 143:443–452Google Scholar
- Nishikawa M, Yokohari F, Ishibashi T (1985) The antennal thermoreceptor of the camel cricket,Tachycines asynamorus. J Insect Physiol 31:517–524Google Scholar
- Tichy H (1979) Hygro- and thermoreceptive triad in antennal sensillum in the stick insect,Carausius morosus. J Comp Physiol 132:149–152Google Scholar
- Tichy H (1987) Hygroreceptor identification and response characteristics in the stick insect,Carausius morosus. J Comp Physiol A 160:43–53Google Scholar
- Yokohari F (1978) Hygroreceptor mechanism in the antenna of the cockroach,Periplaneta. J Comp Physiol 124:53–60Google Scholar