Person who is conscious but unable to move and limbs are spastic?

The condition you're describing may be consistent with "locked-in syndrome," where a person is fully conscious and aware but unable to move or communicate verbally due to complete paralysis of nearly all voluntary muscles in the body, except for some eye movements. This can result from brainstem injuries or certain neurological conditions. Spasticity in the limbs often indicates that there is still some neurological activity, but it is uncoordinated and uncontrolled. Effective communication methods, like eye-tracking technology, can sometimes help those affected express their thoughts and needs.