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.
Diel changes in electrical activities of neurosecretory cells in a virgin female. Numbers of spikes per minute are plotted as a function of the time of day (in hours). Transient increases in activities caused by beginning (arrowheads) or end of light are superimposed on a diel change in the activities. Light regimes (16-h light/8-h dark) are indicated by open (light) and solid (dark) bars.
