I recently got to wondering whether certain eye movements or pupillary responses were correlated with disorders of consciousness (coma, VS, MCS, or even locked-in syndrome). I know that the pupillary response to a direct light-source is part of the usual coma evaluation scale, but my question deals more with resting-state oculomotor activity or stimulus-evoked responses.
An example of such research might be (for example) a paper in which changes in pupil response co-varies with conscious-state changes in an MCS patient.
Does anybody know of any such research?