Researchers at Indiana University conducted an experiment examining how emotional context affects food preferences and learning in orangutans. The study involved six great apes housed at two zoological facilities and was designed to explore whether animals experience joy and how such emotions may influence cognition and learning processes.
The experimental protocol required scientists to first train the orangutans to search through bowls to locate food treats. Participants were then presented with two bowls—one containing a food reward buried beneath material like moss or sawdust, and another with different covering material but no treat. Prior to each presentation, researchers played either a recording of orangutans vocalizing and laughing or environmental sounds like wind, with the audio stimulus corresponding to specific covering materials on different trial days.
On the fifth day of testing, orangutans were presented with two bowls, each containing a treat under one of the two covering substances, and asked to select their preferred option. Analysis of results across multiple trials showed that the apes overall preferred the bowl with the substance previously paired with laughter sounds. Four of the six orangutans demonstrated a clear preference for this association.
Researchers propose that the preference may stem from laughter placing the orangutans in a more positive emotional state during the initial learning phase. The findings suggest that factors beyond reward quantity or frequency influence how animals form and retain associations. Erica Cartmill, senior author and professor of anthropology and cognitive science, noted that emotional state during learning carries implications for memory formation and decision-making.
Cartmill suggested the research has potential applications to human contexts, particularly education. She indicated that while learning rates may remain consistent regardless of mood, students may place greater value on information acquired during positive emotional states, potentially influencing subject preference and career path selection later in life.
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