Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Front Neurosci. 2010 Nov 19;4:186. doi: 10.3389/fnins.2010.00186. eCollection 2010.

Suboptimal integration of reward magnitude and prior reward likelihood in categorical decisions by monkeys.

Author information

  • 1Department of Neuroscience, Columbia University New York, NY, USA.

Abstract

Sensory decisions may be influenced by non-sensory information regarding reward magnitude or reward likelihood. Given identical sensory information, it is more optimal to choose an option if it is a priori more likely to be correct and hence rewarded (prior reward likelihood bias), or if it yields a larger reward, given that it is the correct choice (reward magnitude bias). Here, we investigated the ability of macaque monkeys to integrate reward magnitude and prior reward likelihood information into a categorical decision about stimuli with high signal strength but variable decision uncertainty. In the asymmetric reward magnitude condition, monkeys over-adjusted their decision criterion such that they chose the highly rewarded alternative far more often than was optimal; in contrast, monkeys did not adjust their decision criterion in response to asymmetric reward likelihood. This finding shows that in this setting, monkeys did not adjust their decision criterion based on the product of reward likelihood and reward magnitude as has been reported to be the case in value-based decisions that do not involve decision uncertainty due to stimulus categorization.

KEYWORDS:

categorization; psychometric function; reward bias; signal detection theory

PMID:
21151367
[PubMed]
PMCID:
PMC2996133
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Frontiers Media SA Icon for PubMed Central
    Loading ...
    Write to the Help Desk