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.
Bell County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 28,691. Its county seat is Pineville. The county was formed August 1, 1867, from parts of Knox and Harlan Counties and augmented from Knox County in 1872. The county is named for Joshua Fry Bell, and was originally called Josh Bell but shortened to Bell by 1880.