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, Kentucky. Marshall County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 31,448.[1] Its county seat is Benton.[2] It was a dry county until July 28, 2015, when residents voted for the county to go wet. It is the only Purchase Area county to not border another state.