Opposing pupil responses to offered and anticipated reward values

Tyler Cash-Padgett, Habiba Azab, Seng Bum Michael Yoo, Ben Y Hayden

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Previous studies have shown that the pupils dilate more in anticipation of larger rewards. This finding raises the possibility of a more general association between reward amount and pupil size. We tested this idea by characterizing macaque pupil responses to offered rewards during evaluation and comparison in a binary choice task. To control attention, we made use of a design in which offers occurred in sequence. By looking at pupil responses after choice but before reward, we confirmed the previously observed positive association between pupil size and anticipated reward values. Surprisingly, however, we find that pupil size is negatively correlated with the value of offered gambles before choice, during both evaluation and comparison stages of the task. These results demonstrate a functional distinction between offered and anticipated rewards and present evidence against a narrow version of the simulation hypothesis; the idea that we represent offers by reactivating states associated with anticipating them. They also suggest that pupil size is correlated with relative, not absolute, values of offers, suggestive of an accept–reject model of comparison.

Original languageEnglish (US)
Pages (from-to)671-684
Number of pages14
JournalAnimal Cognition
Issue number5
StatePublished - Sep 1 2018

Bibliographical note

Funding Information:
This work is supported by a CAREER award from NSF (BCS1253576) and a R01 from NIH (DA038615) to BYH. We thank Meghan Castagno, Marc Mancarella and Caleb Strait for assistance with data collection, and the rest of the Hayden lab for valuable discussions. The authors declare that they have no conflict of interest.

Publisher Copyright:
© 2018, Springer-Verlag GmbH Germany, part of Springer Nature.


  • Decision-making
  • Monkey
  • Pupil size
  • Value


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