Declarative referential gesturing in a wild chimpanzee (Pan troglodytes).

Area of Science:

• Primate behavior
• Evolutionary psychology
• Animal cognition

Background:

• Humans uniquely share attention for social bonding.
• Great apes rarely use referential gestures, primarily for imperative purposes.
• This difference suggests human social cognition evolved uniquely.

Purpose of the Study:

• To investigate if wild chimpanzees exhibit referential "showing" gestures.
• To explore alternative explanations for observed "showing" behaviors in chimpanzees.
• To assess the potential for shared attention in non-human primates.

Main Methods:

• Video analysis of a wild chimpanzee (Fiona) showing a leaf to another chimpanzee.
• Examination of 84 similar leaf-grooming events for behavioral context.
• Analysis of alternative motivations: food sharing, initiating grooming, or play.

Main Results:

• Documented a wild chimpanzee using a "showing" gesture towards a conspecific.
• Observed behavior occurred within a specific social context (leaf grooming).
• Alternative explanations like food sharing or initiating social interaction were less likely.

Conclusions:

• Wild chimpanzees may use referential "showing" gestures in specific social contexts.
• The ability to share attention might be a quantitative, not qualitative, difference between humans and apes.
• Findings have implications for understanding the evolution of human social cognition.