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.
Marshall county is located in west Kentucky. Marshall county has 301.25 square miles of land area and 38.92 square miles of water area. As of 2010-2014, the total Marshall county population is 31,223, which has grown 3.64% since 2000.