Evidence both for and against metacognition is insufficient.
The authors' attempt to explore the ability of animals to monitor how certain they are of their choice behavior, necessarily fails both in their effort to include "higher" mammals (such as monkeys and dolphins) in the class of metacognitive organisms (humans) and in their conclusion that "lower" organisms are not capable of similar behavior.
Zentall
Thomas R
TR
Department of Psychology, University of Kentucky, Lexington, KY 40506 zentall@uky.edu http://www.uky.edu/AS/Psychology/faculty/tzentall.html.