Flaccid dysarthria results from damage to LMN, whereas UMN lesions result in spastic dysarthria.Ataxic dysarthria arises from cerebellar damage.

• 弛绥的发音不良起因于较低等的运动伤害，然而较上层运动神经损害会引起痉挛性的构音困难失调的发音不良由小脑的伤害引起。