Type II sensory fiber (group Aβ) is a type of sensory fiber, the second of the two main groups of touch receptors. The responses of different type Aβ fibers to these stimuli can be subdivided based on their adaptation properties, traditionally into rapidly adapting (RA) or slowly adapting (SA) neurons. Type II sensory fibers  are slowly-adapting (SA), meaning that even when there is no change in touch, they keep respond to stimuli and fire action potentials.
Type II sensory fibers are a subset of touch receptors, specifically one of two primary groups. The responses of different type Aβ fibers can be distinguished based on their adaptation properties into rapidly adapting (RA) or slowly adapting (SA) neurons. Type II sensory fibers  exhibit the characteristic of being slowly-adapting (SA), meaning they remain responsive to stimuli even in the absence of any change.