Glossary

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Advanced Driver Assistance Systems(also: ADAS)

A family of in-vehicle technologies that partially automate driving tasks — adaptive cruise control, lane-keeping, automatic emergency braking, parking assistance, blind-spot monitoring — while a human driver retains overall control. ADAS are relevant to accessibility as steps…

Adventitious blindness(also: Acquired blindness, Late blindness, Acquired visual impairment)

Vision loss that occurs after a period of sighted experience, as opposed to congenital blindness (present from birth). People with adventitious blindness retain visual memories, mental imagery, and familiarity with visual concepts like color and spatial layout, which…

Adversarial Stakeholders

Individuals, institutions, or systems that disabled people depend on for access but that simultaneously pose threats of harm. Examples include healthcare providers who discriminate based on stigmatized identities, government agencies that condition benefits on compliance, or…

Advocacy Labor(also: Accessibility Advocacy Labor, Corrective Labor)

The unpaid effort that disabled people must expend to correct biased, ableist, or inaccessible technology outputs and advocate for better representations of disability. In the context of generative AI, advocacy labor includes correcting stereotypical portrayals of disabled…

Aesthetic Blindness

Aesthetic blindness is a myth and misconception rooted in ableism that assumes blind people cannot perceive, appreciate, or create beauty because beauty is rendered solely through visual means. This assumption has historically led to the exclusion of blind and low vision people…

Aesthetic Experience(also: Aesthetic Need, Aesthetic Accessibility)

The emotional, sensory, and imaginative enjoyment people derive from environments, art, media, and everyday scenes - distinct from functional or task-oriented information. Aesthetic accessibility argues that blind, low-vision, Deaf, and cognitively disabled users should have…

Aesthetic Feedback(also: Visual Aesthetic Feedback)

Information provided to a user about the aesthetic qualities of visual content, such as clarity, framing, color balance, mood, lighting, and overall style. For blind creators, aesthetic feedback from AI systems can describe subjective visual qualities that would otherwise be…

Affective Captions(also: Affective Captioning, Emotive Captions)

Captions that convey not only the spoken words but also the emotional qualities of speech — such as valence (positive vs. negative tone) and arousal (intensity) — typically through typographic modulations like font-color, font-weight, or font-size, and increasingly through…

Affective Computing(also: Emotion AI, Emotional AI)

A field of AI that attempts to detect, interpret, and simulate human emotions using technologies such as facial expression analysis, voice tone detection, physiological sensors, and behavioral patterns. Affective computing raises significant accessibility and ethics concerns…

Affective Congruency

The degree to which a system's sensory outputs, interactions, and feedback align emotionally with the user's current affective state and the emotional meaning the user attaches to the experience. Distinct from perceptual congruency, affective congruency concerns whether the…

Affective Engagement(also: Emotional Engagement)

The emotional connection and investment a user develops with a task, activity, or technology. In accessibility and therapeutic contexts, affective engagement goes beyond usability to encompass motivation, enjoyment, and emotional safety. Research shows that affective engagement…

Affective Haptics(also: Emotional Haptics)

A subfield of haptic interaction design concerned with using tactile and kinaesthetic feedback — vibration, pressure, temperature, squeezing, stroking, heartbeat-like pulsation — to communicate, evoke, or regulate emotion. Affective haptics draws on research showing that touch…

Affective Lability(also: Mood Lability, Emotional Lability)

A pattern of rapid, unpredictable shifts in emotional state, often involving intense fluctuations between positive and negative moods with minimal external provocation. Affective lability is commonly associated with ADHD, bipolar disorder, and borderline personality disorder,…

Affective Touch(also: Social Touch, Emotional Touch)

The emotional and social dimension of touch, distinct from discriminative touch that identifies object properties. Affective touch is mediated primarily by C-tactile (CT) afferents in hairy skin and plays a fundamental role in social bonding, emotional communication, and…

Affinity Diagram(also: Affinity Diagramming, KJ Method)

A collaborative analysis method where team members organise large amounts of data — such as user research findings, design ideas, or usability issues — by writing individual items on sticky notes and grouping them on a wall or board according to their natural relationships and…

Affinity Diagramming(also: Affinity Mapping, KJ Method)

A qualitative data analysis and design method where researchers or team members organize individual data points (observations, quotes, ideas) into groups based on natural relationships and themes. In accessibility research, affinity diagramming is commonly used to synthesize…

Affirmative Consent(also: Yes Means Yes)

A consent model that requires explicit, active agreement to an action - typically framed as 'yes means yes' rather than the absence of refusal. Originating in sexual-violence prevention and adopted in HCI work on consent technology, affirmative consent emphasises that silence,…

Affirmative Model of Disability(also: Affirmation Model)

A disability framework that goes beyond the social model by acknowledging disabled individuals's lived experiences and emphasizing their abilities, strengths, and unique perspectives rather than limitations. The affirmative model celebrates disability as a positive identity,…

Affordable Assistive Technology(also: Low-Cost AT, Frugal Assistive Technology)

Assistive devices and technologies designed to be financially accessible to people with disabilities in low-resource settings, where the cost of commercially available assistive technology from the Global North is often prohibitive. Affordable AT leverages local fabrication…

Affordance(also: Perceived affordance)

A property of an object or environment that suggests how it can be used, originally defined by psychologist James J. Gibson in 1977 as the actionable possibilities between an actor and their environment. In design, Donald Norman popularised the concept to describe how visual and…

Aftercare(also: Post-Interaction Care)

Reflective or supportive activity following an intimate, intense, or sensitive interaction, in which participants check in on each other's wellbeing, discuss the experience, and address any needs that arise. The concept is drawn into HCI through consent technology research as a…

Age-Friendly Design(also: Design for Aging, Senior-Friendly Design)

An approach to designing products, services, and environments that accommodates the needs and capabilities of older adults, including those experiencing age-related changes in vision, hearing, cognition, and motor skills. Age-friendly design overlaps significantly with…

Age-Related Accessibility(also: Aging and Accessibility, Older Adult Accessibility)

The design considerations and accommodations needed to ensure digital technology is usable by older adults who experience age-related changes in vision, hearing, cognition, and motor control. Common challenges include reduced visual acuity and contrast sensitivity, narrowed…

Age-Related Capability Decline(also: Age-Related Impairment, Dynamic Diversity)

The gradual reduction in sensory, motor, and cognitive capabilities that typically accompanies ageing, including declining visual acuity, hearing loss, reduced dexterity and fine motor control, and changes in memory and processing speed. Unlike many disabilities that are stable…

Age-Related Changes(also: Aging Effects, Age-Associated Decline)

Physical, sensory, and cognitive changes that occur naturally as people age, affecting how they interact with technology. Common changes include reduced visual acuity, hearing loss, decreased motor control, slower processing speed, and changes in working memory. However,…

Age-Related Decline(also: Age-Related Impairment, Age-Related Changes)

The gradual reduction in physical, sensory, and cognitive abilities that occurs as part of the natural aging process. Age-related declines that affect technology use include reduced visual acuity (difficulty reading small text and icons), decreased fine motor control (difficulty…

Age-Related Dexterity Changes(also: Motor Decline in Aging, Age-Related Motor Impairment)

The gradual decline in fine motor control, hand-eye coordination, and manual dexterity that commonly occurs with aging, affecting the ability to use input devices like mice, keyboards, and touchscreens. These changes are caused by factors including reduced spatial abilities,…

Age-Related Functional Limitations(also: Ageing-Related Accessibility Needs, Age-Related Impairments)

The gradual changes in sensory, motor, and cognitive abilities that commonly occur with ageing, including declining vision, hearing loss, reduced dexterity and fine motor control, and changes in memory and processing speed. These functional limitations often overlap…

Age-Related Impairment(also: Age-Related Decline, Aging-Related Disability)

Functional limitations that commonly develop with advancing age, often involving multiple interacting mild impairments rather than a single major disability. Age-related impairments may affect vision (presbyopia, reduced contrast sensitivity, cataracts), hearing (presbycusis),…

Age-Related Vision Loss(also: Age-Related Visual Impairment)

Vision impairment that occurs as a consequence of aging, representing the most common cause of blindness and low vision worldwide. Conditions include age-related macular degeneration, glaucoma, diabetic retinopathy, and cataracts. The prevalence of significant visual impairment…

Age-Sensitive Design(also: Age-Sensitive Creative AI Mediation)

A design stance that treats age-related physical, cognitive, and digital-literacy characteristics as first-class inputs to the system design process rather than as edge cases to be handled after the fact. For interactive and AI-supported tools, age-sensitive design typically…

Age-friendly design(also: Senior-friendly design, Gerontechnology design)

A design approach that specifically addresses the perceptual, cognitive, and motor changes associated with aging, including larger fonts, simplified interfaces, reduced jargon, higher contrast, and minimized demands on working memory and perceptual speed. Research shows that…

Age-related Differences(also: Age Effects, Generational Differences)

The systematic variations in technology use, learning strategies, and task performance that occur across different age groups. Research consistently shows older adults take 1.5 to 2 times longer than younger adults on technology tasks even when achieving equal accuracy, due to…

AgeTech(also: Age tech, Technology for older adults)

A broad category of technology designed to support older adults in aging well, living independently, and managing age-related health conditions. AgeTech spans smart-home monitoring, voice assistants, medication reminders, fall-detection wearables, social companion robots,…

Ageing in Place(also: Aging in Place)

The ability of older adults to live independently and safely in their own home and community for as long as possible, regardless of age, income, or ability level. Ageing in place is increasingly promoted as an alternative to institutional care, supported by technologies such as…

Ageism(also: Age Discrimination, Age Bias)

Stereotyping, prejudice, and discrimination against people based on their age, most commonly directed at older adults. Ageism manifests at individual, institutional, and societal levels through assumptions about cognitive decline, technology incompetence, resistance to change,…

Agency(also: User Agency, Sense of Agency)

The capacity to act, make choices, and exert control over one's own life and environment. In disability studies, agency is distinguished from independence — a person can have agency (the ability to make decisions and direct actions) while still relying on others for support,…

Agent Mode(also: AI agent mode)

An interaction mode in AI code assistants where the assistant autonomously decomposes a high-level request into subtasks, iteratively plans, executes, and observes — typically editing multiple files, running terminal commands, and self-correcting until goals are met. Agent mode…

Agential Realism

A theoretical framework developed by physicist-philosopher Karen Barad that rejects the idea of pre-existing, independent subjects and objects, arguing instead that phenomena emerge through specific "intra-actions" between apparatus and matter. Applied to accessibility research,…

Agentic AI(also: AI agents, autonomous AI agents)

Agentic AI refers to artificial intelligence systems that can plan, make decisions, and execute multi-step actions autonomously to achieve high-level goals, typically by interacting with software, tools, or environments on behalf of a user. Unlike single-turn AI assistants that…

Agentive Amplifier

A framing of technical artefacts, proposed by Oosterlaken and Van Den Hoven, as things that create possibilities a person would not otherwise have — extending, not replacing, the user's own agency. Under this view the ethical significance of a technology is judged by how it…

Aging(also: Ageing)

Aging is the biological, psychological, and social process of growing older, which in accessibility practice is associated with a predictable cluster of changes: declining near and low-contrast vision, hearing loss at higher frequencies, reduced fine motor precision, slower…

Aging and Accessibility(also: Age-Related Accessibility, Older Adults and Technology)

The intersection of age-related changes in vision, hearing, cognition, and motor skills with the design of accessible digital technologies. As people age, they commonly experience declining visual acuity, reduced contrast sensitivity, slower processing speed, decreased working…

Aging in Place(also: Ageing in Place, Aging-in-Place)

The ability to live safely and independently in one's own home and community as one ages, regardless of age, income, or ability level. Assistive technology, including voice assistants, smart home devices, and remote health monitoring, plays an increasingly important role in…

Aging in Place

The ability of older adults to live independently and safely in their own home and community as they age, supported by appropriate services and technology. In the context of accessibility, aging in place involves designing digital tools, smart home systems, and mobile…

Aging in Place(also: Aging at Home)

The ability to live in one's own home and community safely, independently, and comfortably regardless of age, income, or ability level. Aging in place is a preference for most older adults and involves adapting living environments, accessing supportive services, and using…

Aging in place(also: Ageing in place)

The ability to live in one's own home and community safely, independently, and comfortably regardless of age, income, or ability level. AI-assisted aging-in-place technologies include monitoring systems, fall detection, and health tracking, but raise complex accessibility and…

Agnosia

A neurological condition in which a person has difficulty recognising familiar objects, faces, places, sounds, or other sensory stimuli despite intact basic sensory function and general cognition. Specific subtypes include visual agnosia (difficulty recognising objects or…

Agrammatic Aphasia(also: Agrammatism, Non-fluent Aphasia)

A type of non-fluent aphasia characterised by difficulty with sentence structure and grammar, while word selection is relatively preserved. People with agrammatic aphasia typically produce short, effortful utterances that omit function words (such as articles, prepositions, and…

Agreement Rate(also: AR)

A statistical measure used in end-user gesture elicitation studies to quantify how much consensus participants show when proposing gestures or interactions for a given task (referent). Agreement rate ranges from 0 (no two proposals are equivalent) to 1 (all proposals are…