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.
Mercer County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 21,331. Its county seat is Harrodsburg.The county was formed from Lincoln County in 1785 and is named for Revolutionary War General Hugh Mercer, who was killed at the Battle of Princeton in 1777.It is a prohibition or dry county, though Harrodsburg and Pleasant Hill allow the sale of alcohol by the drink.he county was formed from Lincoln County in 1785 and is named for Revolutionary War General Hugh Mercer, who was killed at the Battle of Princeton in 1777. It is a prohibition or dry county, though Harrodsburg and Pleasant Hill allow the sale of alcohol by the drink.