An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Group mean errors to criterion for initial learning (Initial) and nine serial reversals in object reversal learning. Filled diamonds, Monkeys with bilateral PFo lesions; open diamonds, unoperated controls. Error bars indicate ± SEM.