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.
Different patterns of crawling and sitting distinguished in Studies 1 and 2. Panels depict typical hands-knees crawling (top left), hands-feet crawling (top right), legs-out sitting (bottom left), and kneel-sitting (bottom right). The fifth behavioral category—quadrupedal stance—is a stationary posture resembling hands-knees crawling with all four limbs in contact with the ground.
