Here's a study on Brain Response to One's Own Name in Vegetative State, Minimally Conscious State, and Locked-in Syndrome:
Background A major challenge in the management of severely
brain-injured patients with altered states of consciousness is to
estimate their residual perception of the environment.
Objective To investigate the integrity of detection of one's own name
in patients in a behaviorally well-documented vegetative state (VS),
patients in a minimally conscious state (MCS), and patients with
Design We recorded the auditory evoked potentials to the patient's
own name and to 7 other equiprobable first names in 15 brain-damaged
Results A P3 component was observed in response to the patient's name
in all patients with locked-in syndrome, in all MCS patients, and in 3
of 5 patients in a VS. P3 latency was significantly (P<.05) delayed
for MCS and VS patients compared with healthy volunteers.
Conclusions These results suggest that partially preserved semantic
processing could be observed in noncommunicative brain-damaged
patients, notably for the detection of salient stimuli, such as the
subject's own name. This function seems delayed in MCS and (if
present) in VS patients. More important, a P3 response does not
necessarily reflect conscious perception and cannot be used to
differentiate VS from MCS patients.