Cercal systems of seven insect species (cricketMelanogryllus desertus, mole cricketGryllotalpa gryllotalpa, katydidsPholidoptera pustulipes andTettigonia viridissima, cockroachesPeriplaneta americana andBlatta orientalis, and locustLocusta migratoria) were examined for direction-sensitive giant interneurons (GIs) that are excited by cercal receptors but have directional preferences independent of cercus position. Such GIs are known for the cricketsAcheta domesticus andGryllus bimaculatus. Directional sensitivity diagrams (DSDs) of GIs were obtained by recording and analysing the electrical responses of abdominal connectives to sound stimuli from various directions. For each animal DSDs were plotted in the form of polar graphs for two or three positions of the stimulated cercus so that the effect of cercus position on the orientation of the DSD could be evaluated.
All insects studied had GIs whose DSDs for fixed cercus positions were similar in appearance to the DSDs described for GIs of the cricketsAcheta domesticus andGryllus bimaculatus. Most of these DSDs were shaped like a figure 8 (when airflow is used as the stimulus instead of sound, each DSD has only one lobe). However, not all GIs demonstrated a constant directional preference. GIs with constant directionality were found only inMelanogryllus desertus, Pholidoptera pustulipes, Tettigonia viridissima andLocusta migratoria. In these insects DSDs from one GI plotted for different cercus positions had approximately the same orientation (Figs. 4–7). In contrast, GIs inGryllotalpa gryllotalpa, Periplaneta americana andBlatta orientalis had DSDs whose orientation changed in accordance with a change in position of the stimulated cercus (Figs. 8–10).
Thus, direction-sensitive GIs investigated here can be divided into two types: (1) GIs with constant directionality (whose DSDs are ‘fixed to the body’, and (2) GIs with variable directionality (whose DSDs are ‘fixed to the cerci’). To date, in each species only GIs of the same type have been encountered. This may be an indication that cercal systems can be divided into two categories according to how they process information. However, since we have not tested all GIs in each species, we cannot rule out the possibility that a species might have both types of GIs.
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- DSD :
directional sensitivity diagram
- GI :
- TAG :
terminal abdominal ganglion
Ball EE, Stone RC (1982) The cercal receptor system of the praying mantid,Archimantis brunneriana Sauss. I Cercal morphology and receptor types. Cell Tissue Res 224:55–70
Ball EE, Boyan GS, Stone RC (1982) The cercal receptor system of the praying mantid,Archimantis brunneriana Sauss. II Cercal nerve structure and projection and electrophysiological responses of individual receptors. Cell Tissue Res 224:71–80
Camhi JM, Tom W (1978) The escape behaviour of the cockroachPeriplaneta americana. I. Turning response to wind puffs. J Comp Physiol 126:193–201
Camhi JM, Tom W, Volman S (1978) The escape behavior of the cockroachPeriplaneta americana. II. Detection of natural predators by air displacement. J Comp Physiol 128:203–312
Dagan D, Volman S (1982) Sensory basis for directional wind detection in the first instar cockroachesPeriplaneta americana. J Comp Physiol 147:471–478
Dumpert K, Gnatzy W (1977) Cricket combined mechanoreceptors and kicking response. J Comp Physiol 122:9–25
Edwards JS, Palka J (1974) The cerci and abdominal giant fibres of the house cricket,Acheta domesticus. I. Anatomy and physiology of normal adults. Proc R Soc London Ser B 185:83–103
Füller H, Greifelt W (1977) Zur Variabilität der cercalen Rezeptorfelder vonPeriplaneta americana (L.). Zool Jb Anat 98:544–571
Gnatzy W (1976) The ultrastructure of the thread-hairs on the cerci of the cockroachPeriplaneta americana L.: The intermoult phase. J Ultrastr Res 54:124–134
Jun-Xian Shen (1983) The cercus-to-giant interneuron system in the bushcricketTettigonia cantons: morphology and responses to low-frequency sound. J Comp Physiol 151:449–459
Knjazev AN, Popov AV (1977) Responses of single cercal mechanoreceptors to sound and sinusoidal mechanical stimulation in the cricket. Dokl Acad Nauk SSSR 232:1211–1214
Knjazev AN, Popov AV (1981) Functional organization of the cereal mechanoreceptor system in larval and adult cricketGryllus bimaculatus. Zh Evol Biochim Fiziol 17:503–511
Nicklaus R (1965) Die Erregung einzelner Fadenhaare vonPeriplaneta americana in Abhängigkeit der Größe und Richtung der Auslenkung. Z Vergl Physiol 50:331–362
Palka J, Levine R, Schubiger M (1977) The cercus-to-giant interneuron system of crickets. I. Some attributes of sensory cells. J Comp Physiol 119:267–283
Petrovskaya ED (1969) On frequency selectivity of cercal trichoid receptors in the cricketGryllus domesticus. Zh Evol Biokhim Fiziol 5:337–338
Ritzmann RE, Camhi JM (1978) Excitation of leg motor neurons by giant interneurons in the cockroachPeriplaneta americana. J Comp Physiol 125:305–316
Ritzmann RE, Tobias ML, Fourtner CR (1980) Flight activity initiated via giant interneurons of the cockroach: Evidence for bifunctional trigger interneurons. Science 210:443–445
Ritzmann RE, Pollack AJ, Tobias ML (1982) Flight activity mediated by intracellular stimulation of dorsal giant interneurons of the cockroachPeriplaneta americana. J Comp Physiol 147:313–322
Roeder KD (1948) Organization of the ascending giant fiber system in the cockroach (Periplaneta americana). J Exp Biol 108:243–261
Rozhkova GI (1980) Comparison of the constancy mechanisms in the cercal systems of crickets (Acheta domesticus andGryllus bimaculatus). J Comp Physiol 137:287–296
Rozhkova GI, Polischuk NA (1976a) Constant representation of signal source location in the cereal system of the cricket. Biofizika 21:144–149
Rozhkova GI, Polischuk NA (1976b) On the mechanisms of constant representation of sound signal direction in the cercal system of the cricket. Biofizika 21:725–729
Rozhkova GI, Polischuk NA (1978) Optimal directions of air flows for activation of the giant neurons of the cercal system in the cricketGryllus domesticus. Zh Evol Biokhim Fiziol 14:385–391
Sihler H (1924) Die Sinnesorgane an den Cerci der Insekten. Zool Jb Anat Ontogen 45:519–580
Tobias M, Murphey RK (1979) The response of cercal receptors and interneurons in the cricket to airstreams. J Comp Physiol 129:51–59
Vardi N, Camhi JM (1982) Functional recovery from lesions in the escape system of the cockroachPeriplaneta americana. I. Behavioral recovery. J Comp Physiol 146:291–298
Westin J, Langberg JJ, Camhi JM (1977) Responses of giant interneurons of cockroachPeriplaneta americana to wind puffs of different directions and velocities. J Comp Physiol 121:307–324
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Rozhkova, G.I., Rodionova, H.I. & Popov, A.V. Two types of information processing in cercal systems of insects: directional sensitivity of giant interneurons. J. Comp. Physiol. 154, 805–815 (1984). https://doi.org/10.1007/BF00610681
- Information Processing
- Insect Species
- Directional Preference
- Electrical Response
- Variable Directionality