Figure 2.
Neutral PSN for younger and older observers are shown by filled and unfilled symbols, respectively. Dark circles represent the mean PSN for younger (filled) and older (unfilled) observers. Error bars are ±1 SEM.
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.