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.
Bloomfield, Kentucky. This article is about the present-day city. For the former community of the same name in Bath Co., see Sharpsburg, Kentucky. Bloomfield is a home rule-class city in Nelson County, Kentucky, in the United States. The population was 838 during the 2010 U.S. census.