AAC	augmentative and alternative communication
AI	artificial intelligence
ALS	Amyotrophic Lateral Sclerosis
APP	applications
AR	auto-regressive
ASD	Autistic Spectrum Disorders
AT	assistive technology
BCI	brain computer interface
DL	deep learning
EEG	electroencephalogram
fMRI	functional magnetic resonance imaging
HAAT	Human Activity Assistive Technology
IR	Infrared
IR-PCR	Infrared pupil corneal reflection
LIS	Locked-in-Syndrome
MEG	magnetoencephalography
MEMS	micro-electro-mechanical systems
ML	machine learning
MSE	mean square error
NIR	near-infrared
NIRS	near-infrared spectroscopy
NLP	natural language processing
PPG	photoplethysmogram
SGD	speech generating device
SLCN	speech, language or communication need
SMSW	synthesized machine spoken words
VOCA	voice output communication aid
WPM	words per minute