<unk> es are created with our own movement but not those of other people. This is why other people can tickle us (no<unk> es of the movements that touch us) but we cannot tickle ourselves <unk> es tell us that we are stimulating ourselves). In physiology, an<unk>  or efferent<unk>  is an internal<unk>  of an outflowing (efferent), movement-producing signal generated by an organism's motor system. It can be collated with the (reafferent) sensory input that results from the agent's movement, enabling a comparison of actual movement with desired movement, and a shielding of perception from particular self-induced effects on the sensory input to achieve perceptual stability. Together with internal models,<unk> es can serve to enable the brain to predict the effects of an action. An equal term with a different history is corollary discharge.<unk> es are important in enabling motor adaptation such as to enhance gaze stability. They have a role in the perception of self and nonself electric fields in electric fish. They also underlie the phenomenon of tickling.
Efference copy
Insertion sequence
Hair cloning
Replicon 
Low copy repeats
Deletion 
Fusion transcript
Chimeric gene