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.
mount washington is a home rule class city in northeast bullitt county kentucky in the united states the population was 9117 at the 2010 census the city is one of several surrounding louisville that have experienced a sharp rise in population in the past three decades becoming a commuter town