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The role of afferent activity in behavioral and neuronal plasticity in an insect

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Summary

Cockroaches (Periplaneta americana) have been shown to adapt behaviorally, in about 1 month, to ablation of one cercus. Additionally, those giant interneurons (GIs) that normally receive their major input from the lesioned cercus become more responsive to stimulation of the intact side (Vardi and Camhi 1982 a, b). To investigate the role of afferent activity in the behavioral and neuronal plasticity, we silenced wind-evoked activity in the intact cercus by immobilizing the sensory hairs. This was carried out during the last nymphal stage which lasts for about one month. The animals were tested behaviorally and physiologically after they had molted to adults and a fresh set of mobile hairs had appeared. These animals showed no behavioral correction (Fig. 3). The responses of the GIs on the ablated side were somewhat enhanced, but they were also significantly smaller than those in animals with long-term cercal ablations and no sensory deprivation (Fig. 5). A variety of controls (Figs. 8, 9, and 10) were used to show that sensory deprivation by itself did not decrease the responsiveness of the afferents or the GIs. Thus elimination of wind-evoked activity specifically decreasesenhancement of the responses in the GIs.

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Abbreviations

GI :

giant interneuron

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Volman, S.F., Camhi, J.M. The role of afferent activity in behavioral and neuronal plasticity in an insect. J. Comp. Physiol. 162, 781–791 (1988). https://doi.org/10.1007/BF00610967

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