Receptor adaptation

Adaptation of receptors is different according to the type of receptor. However, the principle of adaptation is the same. With longer exposure to a stimulus of the same intensity, the amplitude of the receptor potential decreases (how much depends on the type of receptor) as well as the frequency of individual action potential.

Tonically responding receptors

 * These receptors adapt slowly and their excitatory activity may not disappear completely even after a long time.
 * This type of receptors mainly registers the intensity of longer acting stimuli.
 * We call this type of adaptation incomplete adaptation.

Phasically responding receptors

 * These receptors adapt quickly.
 * This type of receptors mainly registers an immediate change in the intensity of stimulation or its speed.
 * We call this type of adaptation complete adaptation.

Central vs. receptor adaptation
The central neurons of the sensory pathways exhibit adaptation (central adaptation) which lasts longer than peripheral receptor adaptation, similar to the adaptation of a given sensation.

Related articles

 * Receptors
 * Receptor potential, adaptation
 * Receptor potential
 * Sensory receptors