By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth

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Extra resources for Advances in Insect Physiology, Vol. 11

Example text

Evans and Dethier (1957) performed a series of experiments in which they injected glucose, trehalose or fucose solution directly into the haemocoel of 24 h starved flies. None of the injections caused an increase in threshold even though the sugar concentrations produced in the haemolymph were at least comparable with the highest attained during the post-feeding period of elevated threshold. All these findings show that a high level of sugar in the haemolymph does not alone cause the elevation of the taste threshold of flies previously deprived f c x 24 h.

0 M sucrose from 0 t o 60 min previously. 1 M sucrose when applied t o a single hair was just above the minimum concentration required to elicit proboscis extension in a starved fly, and Getting and Steinhardt (1972) concluded, therefore, that the threshold t o the input from the labellar chenioreceptors is not greatly elevated by feeding. This conclusion is supported by the results of experiments in which Getting and Steinhardt showed that the relationship between sensory input from a single labellar hair and the activity of 'the extensor muscle o f the haustellum was unaffected by previous feeding.

The possibility that perseverating effects generated in the CNS by inputs from internal sources might play a role in the regulation of tarsal threshold has not been directly investigated in P. regina. , 1965, 1968) in parts o f the nervous system of P. regina concerned with feeding behaviour; and this suggests the possibility that input from internal sources might also be capable of producing effects of this kind. So far, in this discussion, it has been implied that any inhibitory feedback involved in the regulation of tarsal threshold influences the responsiveness of the CNS t o excitatory input from the tarsal chemoreceptors and that the receptor sensitivity itself is not markedly affected by the state of deprivation.

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