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.
Matching accuracy for individual pigeons during the first 96-trial session of Symmetry Test 1. Black bars represent accuracy on symmetrical trials with the Set 1 stimuli and gray bars represent accuracy on nonsymmetrical trials with the Set 2 stimuli. Dashed lines show the 95% confidence interval associated with random responding (normal approximation to binomial).
