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.
(Color online) PTCs in the standard (open symbols) and precursor (closed symbols) conditions as a function of signal level in four subjects. Each column of panels represents a different subject. Signal level in dB SPL is plotted in each panel. Error bars represent one standard deviation about the mean.
