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Perceptual biases for multimodal cues in chimpanzee (Pan troglodytes) affect recognition

Abstract

The ability of organisms to discriminate social signals, such as affective displays, using different sensory modalities is important for social communication. However, a major problem for understanding the evolution and integration of multimodal signals is determining how humans and animals attend to different sensory modalities, and these different modalities contribute to the perception and categorization of social signals. Using a matching-to-sample procedure, chimpanzees discriminated videos of conspecifics’ facial expressions that contained only auditory or only visual cues by selecting one of two facial expression photographs that matched the expression category represented by the sample. Other videos were edited to contain incongruent sensory cues, i.e., visual features of one expression but auditory features of another. In these cases, subjects were free to select the expression that matched either the auditory or visual modality, whichever was more salient for that expression type. Results showed that chimpanzees were able to discriminate facial expressions using only auditory or visual cues, and when these modalities were mixed. However, in these latter trials, depending on the expression category, clear preferences for either the visual or auditory modality emerged. Pant-hoots and play faces were discriminated preferentially using the auditory modality, while screams were discriminated preferentially using the visual modality. Therefore, depending on the type of expressive display, the auditory and visual modalities were differentially salient in ways that appear consistent with the ethological importance of that display’s social function.

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Fig. 1
Fig. 2 a

Notes

  1. 1.

    Note that the play faces used in this study were always accompanied by laughter vocalizations, although this is not always the case in naturally occurring behavior.

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Acknowledgements

This investigation was supported by RR-00165 from the NIH/NCRR to the Yerkes Regional Primate Research Center. The Yerkes Primate Center is fully accredited by the American Association for Accreditation of Laboratory Animal Care. Thanks to the Living Links Center, Emory University, for the use of photographic material, and the animal care staff at the Yerkes Primate Center. Todd Preuss, Stuart Zola, and three anonymous reviewers provided helpful comments on earlier versions of this manuscript.

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Correspondence to Lisa A. Parr.

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Parr, L.A. Perceptual biases for multimodal cues in chimpanzee (Pan troglodytes) affect recognition. Anim Cogn 7, 171–178 (2004) doi:10.1007/s10071-004-0207-1

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Keywords

  • Communication
  • Multimodal signals
  • Facial expressions
  • Chimpanzee