Fig 2. Test schedule.
Test periods P0–P4 were defined by test time points stimulus start (t1), subject-reported pain threshold (t2), and pain tolerance (t3).
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.