Sexual status and degree of hunger in chimpanzee competitive interaction.

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Abstract
In previous expts. in which pairs of animals have been presented with single pieces of food and the interactions between individuals observed, relationships were masked by response stereotypy and inertia resulting from excessive success on the part of the dominant animal and excessive failure on the part of the subordinate one. In the present expt. these effects were minimized by pre-rewarding each member of the pair in 50% of the trials. Results indicate that normal [female][female] take a "larger proportion of the critical pieces when in the maximal genital swelling phase than when in the residual phase of the menstrual cycle." The degree of hunger of the subordinate member of the pair is a significant factor in determining what portion of all presentations is taken by each member of the pair.

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