After depolarization: is the slow repolarization phase which follows a rapid fall in spike potential and extends up to attainment of the RMP level. It is called phase of negative after potential and lasts for about 4 ms.
After reaching the resting level (–70 mV) the potential further falls and becomes more negative (–72 mV).This phase is called after hyperpolarization or phase of positive after potential.
What is the reason for naming them as negative and positive after potentials?
My attempt: I think we are naming them based on the direction of current, i.e. during after depolarisation membrane potential is going further negative , so the name negative after potential, and during after hyper polarisation, membrane potential is going from hyper polarised state to resting state, so its named as positive after potential.
Am I correct?
Source:Textbook of physiology