Date of Award


Degree Type


Degree Name

Master of Arts (MA)



First Advisor

Sarah Brosnan

Second Advisor

Michael Beran

Third Advisor

Erin Tone


Primate decision-making is often underlined by cognitive biases and how sequences are evaluated is no different. Human research shows the most salient parts of sequences are the peak and end affect experienced within them along with a preference for sequences with increasing value. However, inconsistent results from non-human primate studies deny the ability to determine if these biases are a primate-wide cognitive shorthand to quickly evaluate experiences, or if these primarily impact humans. This experiment builds on previous works and tests if tufted capuchin monkeys experience an end bias using a dichotomous manual task which allows them to choose between receiving a high reward sooner or later. Overall, capuchin monkeys preferred a higher reward at the start of a sequence, this effect only was strengthened when accounting for delay discounting. Rank and exposure to sequences were most often the best predictors for sequence preference, while sex never impacted choice.


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