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, Kentucky (KY) County population in 2014: 21,319 (41% urban, 59% rural); it was 20,817 in 2000. County owner-occupied with a mortgage or a loan houses and condos in 2010: 4,111. County owner-occupied free and clear houses and condos in 2010: 2,288. County owner-occupied houses and condos in 2000: 6,272.