Figure 1. Frequency coding in the nervous system: Threshold stimulus. 1  If a threshold stimulus is applied to a neuron and maintained (top, red trace), action potentials occur at a maximum frequency that is limited by the sum of the absolute and relative refractory periods (bottom, blue trace).
Phyllis, Kentucky. Phyllis is an unincorporated community located in Pike County, Kentucky, United States. U.S. Geological Survey Geographic Names Information System: Phyllis, Kentucky.
Mason County, Kentucky. Mason County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 17,490. Its county seat is Maysville. The county was created from Bourbon County, Virginia in 1788 and named for George Mason, a Virginia delegate to the U.S. Constitutional Convention, known as the Father of the Bill of Rights.