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.
Meade County, Kentucky. Meade County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 28,602. Its county seat is Brandenburg. The county was founded December 17, 1823, and named for Captain James M. Meade, who was killed in action at the Battle of River Raisin during the War of 1812.