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.
Spectrograms of the natural stimuli used in the experiment. A: monkey calls (bark, coo1, coo2, coo3, girney, grunt, harmonic arch, pant threat, scream1, scream2). B: environmental sounds (middle row: cage [sound of monkey swinging], cage divider, cage lock open, monkey chair latch close, monkey chair latch open; bottom row: monkey pole latch, moving food container, vacuum pump, VCR and TV turning on, water running in sink). The frequency axis of the spectrograms has a logarithmic scale.
