Which of the following is a sign of a proprioception deficit?

paralysis
ataxia
impaired sense of taste
muscle twitching

Ataxia is a sign of proprioception deficit. Ataxia means clumsiness, or loss of coordination.

Proprioception is the brain's knowledge of the relative positions of the body's parts. Each human joint and muscle is monitored by internal sensors (proprioceptors) capable of registering even minute changes of position and pressure and passing on messages concerning the state of the organism back to the brain's processing system, which identifies an almost infinite number of combinations of meaningful patterns.

Proprioception Deficit Disorder (PDD); also called Sacks' Syndrome or Descartes' Disease is a complete and total failure of the body's knowledge of itself resulting in a complete lack of coordination. The mind is completely unaware of its own body.

ataxia

Proprioception is the sense of your limbs in space (orientation, distance etc). Ataxia is basically clumbsiness caused by improper functioning of proprioception.