Table 1.

Description of participant characteristics including etiology, duration of neurological disorder, current age, gender, self-reported vertical and horizontal visual impairment, primary mode of communication, and message preference.

ID	Etiology	Duration (years)	Age (years)	Gender	Oculomotor vertical	Impairment horizontal	Primary AAC Preference	Message
P1	ALS	5	45	M	no	no	Eye-tracking	Spelling
P2	ALS	27	61	M	no*	no	Mouthing	Spelling
P3	TBI	9	31	M	no†	no†	Blinking	Phrases / Symbols
P4	PSP	3	64	F	yes	no	Gestures	Spelling / Phrases
P5	BS	13	29	M	no	yes	Vertical Eye Movement	Phrases / Symbols

^†Participants P3, P4 and P5 all had significant oculomotor impairment associated with their disorder (even though P3 did not report any visual deficits) while P1 and P2 were able to control an eye-gaze tracking AAC device to some extent.

^*P2 reported no oculomotor deficits, but presented with a ptosis of the right eye. Abbreviations: brainstem stroke (BS); progressive supranuclear palsy (PSP), traumatic brain injury (TBI); amyotrophic lateral sclerosis (ALS).