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Its production & cessation are difficult to reconcile with Lorenz's famous "water tank" analogy, by comparison of motivation to a fluid which accumulates and is stored within an animal, to be released or discharges only by the performance of specific acts. It is also impossible to reconcile with the usual division of behavior patterns into appetitive consummatory patterns (see the discussion in [[?]] 1953 for the best discussion of the supposed distinction between these 2 types.
Many of these songs given by the males of separated from their mates may be considered appetitive, insofar as they do not result in appreciable decrease in motivation or responsiveness (as shown by the fact that they may be repeated indefinitely as long as the  appropriate releasing situation is maintained). Other songs, [[?]] identical and produced by the same causal factors, may be considered consummatory, insofar as they bring about a drop in motivation, leaving the performing bird in an apparently perfectly "satisfied" state of relaxation. Thus the singing as a whole may be appetitive or consummatory depending on the reaction it produces in another bird. ([[?]] has pointed out that there are some patterns which are known to be intermediate between typical consummatory patterns and typical appetitive patterns in one way or another, but he does not cite patterns which may be appetitive at one time or consummatory at another depending upon different external circumstances)
It is obvious, in fact, that the "object" of this singing is to bring the performing bird into a particular "consummatory situation", in this case, a particular physical relationship with another bird. 
The most peculiar feature of the pattern is that it doe snot itself determines whether it will be consummatory or not