The phylogenetic roots of cognitive dissonance

Area of Science:

• Cognitive Science
• Comparative Psychology
• Animal Behavior

Background:

• Cognitive dissonance is a psychological phenomenon where individuals experience discomfort when holding conflicting beliefs or attitudes.
• Previous research has explored cognitive dissonance in humans, but its presence in non-human animals, particularly primates, remains less understood.

Purpose of the Study:

• To investigate whether non-human primates exhibit cognitive dissonance.
• To determine if the resolution of cognitive dissonance differs between primates and nonprimates.

Main Methods:

• A cognitive dissonance paradigm was adapted from Egan, Santos, and Bloom (2007).
• Subjects included Old World monkeys, chimpanzees, parrots, and American black bears.
• Trials involved choices between equally preferred food items, with subsequent presentation of unchosen and novel options.

Main Results:

• Overall, subjects did not show a preference for novel items in either experimental or control conditions.
• A significant interaction effect was observed between subject type and experimental condition.
• Primates, unlike nonprimates, preferred the novel item in experimental trials, suggesting they devalued the unchosen option.

Conclusions:

• The findings suggest that cognitive dissonance resolution, specifically devaluing an unchosen option following a free choice, may be unique to the primate order.
• This implies that the capacity to resolve cognitive dissonance through choice-dependent devaluation is not universal across all animal taxa.