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The demonstration that displacement activities can be influenced by direct relevant stimulation (van Iersel and Bol, 1958: Rowell, 1961; Sevenster, 1961) has led to a rejection of the view that they must necessarily be 'allochthonous' (Kortlandt, 1940). Although the latter view is implicit in the original definitions of displacement activity (Kortlandt, 1940; Tinbergen, 1940) many recent authors have suggested that the term should continue to be used in a purely descriptive sense. Accordingly, in this paper, the term 'displacement activity' is applied to activities which belong to motivational and functional systems other than that predominantly activated at the time of observation. The first step in explaining the occurrence of a displacement activity must be to determine to which system the activity belongs. This is the main object of this paper, in which a typical displacement activity is examined in relation to the motivational complex characteristic of the situation in which it occurs. (Author)