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Open Access Publications from the University of California


The International Journal of Comparative Psychology is sponsored by the International Society for Comparative Psychology. It is a peer-reviewed open-access digital journal that publishes studies on the evolution and development of behavior in all animal species. It accepts research articles and reviews, letters and audiovisual submissions.

Volume 4, Issue 4, 1990

Research Article

Influence of Nonobvious Learning on the Development of the Approach Response in Chicks (Gallus gallus)

The role of prenatal auditory stimulations in the development of the postnatal approach response in young nidifugous birds is well known. However most of the studies in this area treat these stimulations as passive events. The purpose of this experimental series is to establish a link between prenatal stimulations and concomitant modifications of embryonic environment (warming and egg turning). Chicks were thus tested in a situation in which they could choose between two pure tones, one of which was or was not prenatally associated with these two stimuli. All chicks of the four groups used here were artificially incubated at the laboratory. After hatching, one-day-old subjects were placed three times a day for 3 days in a situation of choice between two pure tones (HFT = 1000 Hz or LFT = 500 Hz, of 200 ms duration played back every 3 seconds). The operant response (crossing over one of the two active zones  allows the subject to hear either HFT or LFT. Number and duration of passings over each active zone were recorded. Results of the first control experiment showed that from the first test day naive chicks displayed a spontaneous preference for the low frequency pure tone. Another group of chicks was prenatally stimulated with HFT. This did not significantly affect the initial preference. In a third group, prenatal stimulations were repeatedly associated with modifications of the embryo's environment, i.e., warming and egg rotation. Results showed that the expression of the spontaneous preference for LFT was significantly delayed.  The fourth group confirmed the specificity of this effect. The contribution of such nonobvious prenatal learning to the development of the approach response is discussed.

Maternal Behaviour in Domestic hens (Gallus gallus domesticus): Cues from Chicks and Maintenance of Maternal Responsiveness

Maternal responsiveness in adult hens was measured by studying their rates of vocalization over a period of 12 days. Four roups of hens were compared: one group was isolated both visually and tactually from chicks; two other groups were exposed either to visual cues or to tactile cues originating from chicks, and in the last group, hens received both types of cues. Visual or tactile cues alone induced similar levels of maternal responsiveness but simultaneous presentation of both types of cues induced maximum responsiveness.

Behavioural Screening and Selection Through Affinity: The Case of Polygyny in Paper Wasps (Polistes dominulus)

An evolutionary model for emergence of polygynous foundation in polistine paperwasps is proposed. Adapted from Hamilton's model, the model is based on selection through affinity, a process of genetic assortment. This would involve selective association of founding wasps on the basis of common possession of a behavioural trait. The model, therefore, invokes a form of behavioural screening in a genetically heterogeneous population. The validity of the hypothesis and the nature of the trait concerned are considered in relation to observations on formation of Polistine polygynous associations and between species comparisons.