By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth
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Extra resources for Advances in Insect Physiology, Vol. 11
1965) that the changes in the level of central excitation, as measured by subsequent responsiveness to water, generated by the brief stimulation of one labellar hair with sucrose was greater in deprived flies than in recently sugar fed ones, and that the effect increased up t o about 60 h of deprivation. This result appears, at first sight at least, to be incompatible with that of Getting and Steinhardt (1972), but it seems that the two might be reconciled by assuming that the sensory input from the labellar receptors has access t o more than one part of the CNS, and that the part directly involved in proboscis extension is not that in which the perseverating effect is being generated.
There is, however, conflicting information, which will be discussed later, about the specific effect o f recurrent nerve section on the tarsal thresholds of P. regina to sugars, even though it is clear that the operation impairs the ability of flies to regulate their intake of sugar solution. 0 M fructose they would consume 12 h later. He found that the meals taken by the sugar-injected flies were smaller than those taken by the saline-injected controls and concluded that the presence of a high concentration of sugar in the haemolymph delayed the normal post-ingestion decline in the threshold.
0 M glucose but that these flies showed abnormally persistent response tc tarsal contact with water. The discrepancies in the results are discussed in some detail by Dethier (1969) and, at this point, I can only agree with his conclusion that additional experimental information is required about the precise effect of recurrent nerve section in P. regina. However, even in the absence of certain knowledge about the effects of recurrent nerve section, it seems safe t o assume that input signalling the presence of fluid in the fore-gut plays an important part in bringing about the elevation of tarsal threshold t o sugar.
Advances in Insect Physiology, Vol. 11 by J. E. Treherne, M. J. Berridge, V. B. Wigglesworth