Rhesus monkeys (Macaca mulatta) adaptively monitor uncertainty while multi-tasking.

As researchers explore animals' capacity for metacognition and uncertainty monitoring, some paradigms allow the criticism that animal participants-who are always extensively trained in one stimulus domain within which they learn to avoid difficult trials-use task-specific strategies to avoid aversive stimuli instead of responding to a generalized state of uncertainty like that humans might use. We addressed this criticism with an uncertainty-monitoring task environment in which four different task domains were interleaved randomly trial by trial. Four of five macaques (Macaca mulatta) were able to make adaptive uncertainty responses while multi-tasking, suggesting the generality of the psychological signal that occasions these responses. The findings suggest that monkeys may have an uncertainty-monitoring capacity that is like that of humans in transcending task-specific cues and extending simultaneously to multiple domains.