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.
The county is located in Kentucky's 5th congressional district represented by Representative Hal Rogers. Health. In July 2010 the Washington Post named Clay County the unhealthiest county in Kentucky, and one of the unhealthiest in the nation, . Clay County also featured prominently in a June 2014 NY Times article about the difficulty of living in poverty in eastern Kentucky, ranking last in overall ratings for counties in the United States.