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Advances in Insect Physiology, Vol. 11 by J. E. Treherne, M. J. Berridge, V. B. Wigglesworth

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

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BARTON BROWNE maximal at the time of the cessation of feeding, but it seems unsafe t o assume that the time course of changes in the neural consequences of hormone action would necessarily be simply related t o the time course of changes in the hormone titre. It seems reasonable therefore t o draw the general conclusion that direct neural effects of events during feeding do not play a dominant role in bringing about threshold elevation, but that hormonal material released during feeding might possibly play a part, bearing in mind the previously mentioned temporal limits on any such effects.

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.

Also relevant t o the assessment of the possible role of d:irect events during feeding is the statement by Dethier and Bodenstein (1958) that flies which had undergone recurrent nerve section failed t o show the normal post-feeding rise in tarsal threshold. If this is so, it would follow that direct effects of events during ingestion play no significant role in bringing about the post-feeding elevation in threshold. 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.

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