Glossary

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Ehlers-Danlos Syndrome(also: EDS)

A group of heritable connective tissue disorders characterized by joint hypermobility, skin hyperelasticity, and tissue fragility. EDS often leads to frequent joint dislocations, chronic pain, and difficulty with physical tasks like gripping objects, holding books, or opening…

Eigenfaces

A computer vision technique for face recognition that uses Principal Component Analysis to represent faces as a linear combination of standardized face components (eigenvectors derived from a training set of face images). Developed by Turk and Pentland in 1991, Eigenfaces was…

Eight-Dot Braille(also: 8-Dot Braille, Computer Braille)

An extended braille system that adds two additional dots below the standard six-dot braille cell, creating a 2x4 matrix of eight dots that can represent 256 unique characters (compared to 64 in standard 6-dot braille). Eight-dot braille is primarily used with refreshable braille…

Ekman Basic Emotions(also: Basic Emotions, Ekman's Six Basic Emotions)

A taxonomy proposed by psychologist Paul Ekman that identifies six cross-culturally recognisable emotional expressions — happiness, sadness, anger, fear, disgust, and surprise — as the building blocks of facial affect. The model has been foundational for computer-vision…

Electrical Muscle Stimulation(also: EMS, Neuromuscular Electrical Stimulation, NMES)

A technique that uses electrical impulses delivered through surface electrodes to elicit muscle contractions. EMS is used therapeutically for muscle re-education, spasticity management, and rehabilitation, and has been explored in HCI as an output modality — for example, guiding…

Electrodermal Activity(also: EDA, Galvanic Skin Response, GSR)

The variation of electrical conductance in the skin caused by sweat gland activity, which is controlled by the sympathetic nervous system. EDA is used as a physiological measure of emotional arousal and stress, with applications in accessibility research for understanding the…

Electroencephalography(also: EEG)

A non-invasive method of recording electrical activity of the brain using electrodes placed on the scalp. In assistive technology, EEG is the primary sensing technology behind brain-computer interfaces (BCIs), which allow people with severe motor impairments such as paralysis or…

Electroencephalography(also: EEG)

A non-invasive method of recording electrical activity in the brain using electrodes placed on the scalp. EEG is fundamental to most consumer and research brain-computer interfaces because it is relatively inexpensive, portable, and safe compared to invasive neural recording…

Electrolarynx(also: Artificial Larynx, Electronic Larynx)

A handheld, battery-powered device that produces voice for people who have lost their larynx. The device is held against the neck or cheek and generates vibrations that travel through the throat tissues into the oral cavity, where the user shapes the vibration into speech using…

Electrolarynx(also: Artificial Larynx, Electric Larynx, EL Device)

A handheld battery-powered device that produces mechanical vibrations to generate speech for people who have lost their larynx (voice box), typically due to laryngeal cancer surgery. The device is held against the neck or cheek, where it transmits vibrations through the tissue…

Electromagnetic Actuation(also: EM Actuation)

A method of producing physical movement using electromagnetic fields generated by electric coils. In accessibility contexts, electromagnetic actuation is used to move tactile elements — such as magnetic markers or braille pins — to create dynamic tactile displays and interfaces…

Electromagnetic Tracking(also: Magnetic Tracking, 6-DOF Tracking)

Electromagnetic tracking is a position and orientation sensing technology that uses electromagnetic fields to determine the location and rotation of a sensor in three-dimensional space. Systems like the Polhemus tracker generate a low-frequency magnetic field from a stationary…

Electromyography(also: EMG, Electromyogram)

Electromyography (EMG) is a technique for measuring the electrical activity produced by muscles when they contract or are at rest. In accessibility and assistive technology, EMG sensors placed on the skin can detect muscle activations even when there is no visible movement,…

Electronic Assistive Technology(also: EAT, Electronic AT)

Computer-based devices and systems that enable people with severe disabilities to perform tasks they would otherwise be unable to accomplish, including communication, environmental control, mobility, and computer access. Electronic assistive technologies are often integrated…

Electronic Curb-Cut Effect(also: Digital Curb-Cut Effect, Curb-Cut Effect)

The phenomenon where accessibility features originally designed for people with disabilities end up benefiting a much wider population. Named after physical curb cuts in sidewalks — originally mandated for wheelchair users but widely used by people with strollers, delivery…

Electronic Textbook(also: E-Textbook, Digital Textbook, Interactive Textbook)

A digital version of an educational textbook that goes beyond simply reproducing printed content on screen by offering interactive features such as searchable text, bookmarking, embedded exercises and assessments, multimedia content, annotations, progress tracking, and adaptive…

Electronic Travel Aid(also: ETA)

An electronic device designed to help blind or visually impaired people navigate their environment by detecting obstacles and conveying spatial information through non-visual feedback such as audio cues, vibrations, or tactile signals. Electronic travel aids range from simple…

Electrooculogram(also: EOG, Electrooculography)

The electrooculogram (EOG) is a technique for measuring the electrical potential difference between the front and back of the eye using surface electrodes placed around the eyes. This corneal-retinal potential (CRP) varies linearly with eye rotation along both horizontal and…

Electropalatography(also: EPG, Dynamic Palatography, Palatography)

A technique for recording tongue-palate contact during speech using an artificial palate fitted with electrodes. When the tongue touches the palate, it completes a low-amperage electrical circuit that is detected and displayed visually in real time. In accessibility and deaf…

Electrotactile(also: Electrotactile Stimulation, Electrical Tactile Stimulation)

A form of tactile feedback that applies controlled electrical current to stimulate touch nerve endings in the skin, creating sensations of pressure, tingling, or texture. Electrotactile displays can achieve higher spatial resolution than vibrotactile systems because electrodes…

Electrotactile Feedback(also: Electrotactile, Electrical Tactile Stimulation)

A form of haptic feedback that uses controlled electrical current applied directly to the skin or through a thin insulating layer to generate tactile sensations. Unlike vibrotactile feedback (which uses mechanical vibration) or pressure feedback (which uses physical force),…

Element Detection(also: UI Element Detection, Widget Detection, Object Detection)

The task of automatically identifying the locations and types of user interface components (such as buttons, text fields, images, and checkboxes) from a screenshot using computer vision models. Element detection is important for accessibility because it can identify interactive…

ElevenLabs

A commercial AI voice platform that generates realistic synthetic speech and voice clones from text. ElevenLabs is used in accessibility contexts for producing narrated video voiceovers, audiobook-style readings, and personalized text-to-speech voices, and it has been adopted in…

Elicitation Study(also: Gesture Elicitation Study)

An elicitation study is a user research method in which participants are shown the effect of an action (called a referent) and asked to propose the input or gesture (called a sign) that should cause it. This approach generates user-defined interaction techniques rather than…

Eligibility Theatre

A term coined by Curtis et al. (2026) to describe the performance of visible, narrowly-framed disability that claimants are forced to stage in order to satisfy bureaucratic and algorithmic expectations of welfare and benefits systems. Applicants with invisible or communication…

Emacspeak(also: The Emacspeak Audio Desktop)

A free, open-source speech output system built on top of the Emacs text editor that provides complete auditory access to a computing environment for blind and visually impaired users. Created by T. V. Raman in 1994 and still actively maintained, Emacspeak pioneered the concept…

Email Anxiety(also: Inbox Anxiety)

Intense anxiety, dread, or avoidance behavior around checking, opening, and responding to emails, commonly experienced by people with ADHD. Email anxiety can involve physical symptoms like racing heart and nausea, fear of receiving negative feedback or reminders of missed…

Emancipatory Research(also: Emancipatory Disability Research)

A research paradigm that positions people with disabilities not merely as research subjects but as active agents who lead and control research about their own lives and experiences. Emerging from the disability rights movement and the social model of disability, emancipatory…

Embedded Description(also: Inline Description, Integrated Description)

A technique for making presentation content accessible where the speaker verbally describes relevant visual information on slides — including text, images, graphics, and other visual aids — as part of their narration during the presentation itself. Unlike audio descriptions…

Embedded System(also: Embedded Device, Embedded Computer)

A specialised computer system designed to perform a dedicated function within a larger device, typically operating with real-time constraints and limited resources. Unlike general-purpose computers, embedded systems are built into the products they control. In assistive…

Embodied Agent(also: Embodied Conversational Agent, Embodied AI)

An interactive system that is represented in physical or graphical form with a body, face, or avatar, allowing it to communicate with users through multiple modalities such as speech, gesture, gaze, and expression. Embodiment matters in accessibility contexts because physically…

Embodied Cognition(also: Embodiment)

A theory in cognitive science proposing that the mind is not an isolated entity but is deeply integrated with the body's sensorimotor systems. In other words, how we think, perceive, and make decisions is shaped by our physical bodies and their interactions with the environment.…

Embodied Communication(also: Embodied Interaction)

Communication that involves the whole body as a resource for meaning-making, including gestures, posture, facial expressions, gaze, touch, and physical movement through space. Embodied communication recognizes that meaning is not solely transmitted through words but is…

Embodied Conversational Agent(also: ECA, Virtual Agent, Animated Agent)

A computer-generated animated character designed to interact with human users using multiple simultaneous communication channels — typically speech, eye gaze, facial expression, head and body posture, and hand gestures. ECAs are used in tutoring systems, customer-service agents,…

Embodied Critique(also: Embodied Feedback, Body-Based Critique)

A method of expressing critical feedback through physical bodies and bodily actions rather than relying solely on spoken or written language. Embodied critique draws on disability cultures where communication frequently extends beyond verbal or textual modes, recognizing that…

Embodied Experience(also: Embodied Interaction, Embodiment (UX))

The dimension of user experience that arises from the body's sensory and kinaesthetic encounter with a system or environment — motion, vibration, balance, proprioception, ambient sound, and felt pace — rather than from explicit information channels. In autonomous transport,…

Embodied Expertise(also: Embodied Knowledge, Tactile Expertise)

Skilled knowledge that resides in the body through practiced physical routines, muscle memory, and sensory awareness rather than in explicit cognitive rules or visual information. In accessibility research, embodied expertise describes the sophisticated tactile and kinesthetic…

Embodied Exploration

An approach to virtual environment interaction in which the user builds understanding of a space by physically walking, turning, reaching, and sweeping rather than by teleporting or using controller-based locomotion. Embodied exploration is particularly important for blind and…

Embodied Harassment

Harassment in virtual reality environments that targets a user's avatar body or physical representation, such as invading personal space, mimicking movements, or physically interacting with avatar features without consent. In the context of disability, embodied harassment…

Embodied Ideation(also: Embodied Design Ideation)

A design method that engages participants in generating ideas through physical movement, bodily interaction, and hands-on exploration rather than purely verbal or written communication. In accessibility contexts, embodied ideation is particularly valuable for including…

Embodied Interaction(also: Embodied Cognition in HCI)

An approach to human-computer interaction that emphasizes the role of the physical body in how people engage with and understand technology. Embodied interaction recognizes that cognition is not purely mental but shaped by physical experience, movement, and sensory engagement.…

Embodied Knowledge(also: Embodied expertise, Lived knowledge)

Knowledge that is grounded in bodily experience rather than externally observable behaviour or abstract rule - the kind of knowing a person who stutters has about the tension before a block, a blind person has about which photo crops preserve meaning, or a Deaf signer has about…

Embodied Learning(also: Embodied Cognition, Kinesthetic Learning)

A learning approach that engages the whole body in the process of understanding, not just the mind. Embodied learning recognizes that physical movement, touch, spatial navigation, and bodily interaction with environments contribute fundamentally to how people construct…

Embodied Sketching

Embodied sketching is a participatory design method in which participants and designers physically act out interaction ideas with their bodies, props, and the surrounding space rather than only sketching them on paper or screen. It surfaces movement, social, and sensory…

Embodied Skill Learning(also: Motor Skill Learning)

A view of learning in which acquiring a skill - such as a sign language gesture, a musical performance, a sport movement, or a rehabilitation exercise - depends on coordinated bodily action rather than on memorising symbolic information. Embodied skill learning emphasises…

Embodied cognition(also: Embodied learning, Enactive cognition)

A theoretical framework proposing that cognitive processes are deeply shaped by the body's interactions with its physical environment — that thinking is not purely abstract but is grounded in sensory experience, motor action, and bodily engagement with materials. In…

Embodied participation(also: Embodied presence)

The experience of being physically present and actively engaged in a shared space through one's body or a technological proxy for it. In accessibility contexts, embodied participation refers to how technologies like telepresence robots can provide remote users with a physical…

Embodiment(also: Virtual Embodiment)

The sense of inhabiting and controlling a virtual body in VR, feeling that the avatar is an extension of oneself rather than a separate entity. Embodiment is fostered through synchronized tracking of physical movements to avatar movements, visual congruence between the user's…

Embossed Braille(also: Hard Copy Braille, Paper Braille)

Braille text produced by physically raising dots on paper or other materials, creating a tactile surface that can be read by touch. Embossed Braille is produced using Braille embossers (printers), slates and styluses, or Braille typewriters such as the Perkins Brailler. It…

Embossed Graphics(also: Embossed Tactile Graphics, Raised Graphics)

Tactile graphics produced by a braille embosser or similar device that creates raised dots and lines on heavy paper or card stock. Embossed graphics are one of the most common methods for producing tactile representations of visual information for blind and visually impaired…