From the above-referenced site:

MYTH: Terri is PVS (Persistent vegetative state)
FACT: The definition of PVS in Florida Statue 765.101:
Persistent vegetative state means a permanent and irreversible condition of unconsciousness in which there is:

(a) The absence of voluntary action or cognitive behavior of ANY kind.
(b) An inability to communicate or interact purposefully with the environment.

Terri´s behavior does not meet the medical or statutory definition of persistent vegetative state. Terri responds to stimuli, tries to communicate verbally, follows limited commands, laughs or cries in interaction with loved ones, physically distances herself from irritating or painful stimulation and watches loved ones as they move around her. None of these behaviors are simple reflexes and are, instead, voluntary and cognitive. Though Terri has limitations, she does interact purposefully with her environment.