Glossary

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Active Aging(also: Active Ageing, Healthy Aging, Successful Aging)

A policy framework and paradigm promoted by the World Health Organization that emphasizes maintaining physical activity, social engagement, and independence in later life to improve health outcomes and quality of life. While the concept has influenced health policy and…

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…

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…

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 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…

Ambient assisted living(also: AAL, Smart home assistive living)

Technology systems embedded in the home environment — including sensors, microphones, and smart devices — that monitor and support older adults or people with disabilities to live independently and safely. AAL aims to detect emergencies like falls, remind about medications, and…

Anticipatory Grief(also: pre-death grief, anticipatory mourning)

Grief experienced before an expected loss, particularly common among caregivers of individuals with progressive neurodegenerative conditions such as Alzheimer's disease. Anticipatory grief encompasses mourning not only of the anticipated death, but also of the ongoing losses…

Assets-Based Design(also: Strengths-Based Design, Asset-Based Approach)

A design philosophy that focuses on the existing strengths, capabilities, resources, and strategies of users rather than defining them primarily by their deficits or limitations. In accessibility and aging contexts, assets-based design means building technology that integrates…

Assisted Living Technology(also: Assistive Living Technology, Ambient Assisted Living, AAL)

Technology systems designed to help people with disabilities, chronic conditions, or age-related limitations live more independently in their homes or residential facilities. This includes smart home automation, health monitoring, fall detection, medication reminders, and…

Assistive Robot(also: Personal Assistive Robot, Socially Assistive Robot, Caregiving Robot)

A robot designed to assist people with disabilities, older adults, or those with chronic conditions in performing daily activities or maintaining independence. Assistive robots may provide physical assistance (manipulation, mobility), cognitive support (reminders, step-by-step…

Biomedicalization of Aging(also: Medicalization of Aging)

The tendency, identified by critical gerontologists, to reduce the complexity of later life to problems of physical and cognitive decline requiring medical or technological intervention. Biomedicalization frames older adults as patients rather than citizens, and positions…

Biometric Authentication(also: Biometrics, Biometric Security, Behavioral Biometrics)

Security technology that uses unique biological or behavioral characteristics to verify identity, including fingerprints, facial recognition, iris scans, voice patterns, and handwritten signatures. Accessibility considerations are critical because many biometric systems assume…

Care Staff(also: Care Worker, Direct Care Worker, Personal Care Aide)

Individuals who provide day-to-day personal care and support to residents in care facilities, including assistance with eating, bathing, dressing, toileting, and mobility. Care staff are distinct from medical professionals such as nurses and doctors; they typically receive basic…

Care Technology(also: Care robots, Robots for care, Assistive care technology)

Technology designed to support caregiving activities in institutional or home settings, including robotic systems, monitoring devices, and digital tools that assist care workers and care recipients. Care technology encompasses a broad range of applications from documentation…

Caregiver(also: Family Caregiver, Informal Caregiver, Carer)

A person who provides unpaid assistance with daily activities, emotional support, and care coordination for a family member, friend, or neighbor who has a disability, chronic illness, or age-related needs. Caregivers face significant physical, emotional, financial, and time…

Caregiver Burden(also: Carer Burden, Caregiver Stress)

Caregiver burden refers to the physical, emotional, social, and financial strain experienced by individuals who provide ongoing care to a family member or partner with a disability, chronic illness, or age-related condition such as dementia. Caregivers often experience…

Caregiver Burnout(also: carer burnout, caregiver exhaustion)

A state of physical, emotional, and mental exhaustion that occurs when a caregiver does not get the support or respite they need, often resulting from the sustained demands of caring for a person with a chronic or progressive condition such as Alzheimer's disease. Symptoms…

Co-morbidity(also: Comorbidity, Co-occurring Conditions, Multiple Disabilities)

The simultaneous presence of two or more medical conditions or disabilities in a single individual. In accessibility contexts, co-morbidity is a critical design consideration because many users, particularly older adults, experience multiple impairments simultaneously — for…

Cognitive Aging(also: Age-Related Cognitive Decline)

Cognitive aging refers to the normal, gradual changes in cognitive function that occur as people grow older. These changes typically include declines in processing speed, working memory capacity, selective attention, and fluid intelligence (the ability to reason about novel…

Cognitive Decline(also: Cognitive Deterioration, Cognitive Aging)

A gradual reduction in cognitive abilities such as memory, attention, language, reasoning, and executive function that may occur as part of normal aging or as a symptom of neurological conditions such as mild cognitive impairment (MCI) or dementia. Cognitive decline exists on a…

Compassion Fatigue(also: secondary traumatic stress, empathy fatigue)

A state of emotional and physical exhaustion that results from the prolonged exposure to others' suffering, particularly in caregiving contexts. Unlike burnout, which develops gradually from chronic workplace stress, compassion fatigue can emerge rapidly and is characterized by…

Critical Gerontology

An interdisciplinary approach to the study of aging that critiques the dominant biomedical framing of later life and foregrounds structural, political, and cultural influences on older people's experiences. Critical gerontology rejects the "discourse of decline" in which aging…

Crystallized Intelligence(also: Gc)

Crystallized intelligence refers to the accumulated knowledge, skills, vocabulary, and general information a person acquires through experience and education over their lifetime. Unlike fluid intelligence, which declines with age, crystallized intelligence tends to remain stable…

Dementia

A group of progressive neurological conditions that affect memory, thinking, orientation, comprehension, language, and judgment. Alzheimer's disease is the most common form. Dementia significantly impacts how people interact with digital technology, often requiring simplified…

Dementia-Friendly(also: Dementia Friendly Community, Dementia Inclusive)

An approach to designing environments, services, programs, and communities that are accessible, supportive, and inclusive of people living with dementia. A dementia-friendly community enables people with dementia to participate in social life, access services, and maintain…

Design for Dynamic Diversity(also: D3, DDD)

A design paradigm proposed by Gregor, Newell, and Zajicek (2002) that explicitly accounts for the fact that human abilities are not static but change dynamically over time, particularly as people age. Unlike traditional approaches that design for a fixed "typical" user or treat…

Dialogue of Care(also: Care Dialogue, Care Communication)

The ongoing exchange of information, observations, and concerns between a person receiving care and their carers — whether professional, familial, or informal. In assistive technology and telecare contexts, the dialogue of care refers to the shared understanding that develops…

Digital Immigrant(also: Digital Non-Native)

A person who grew up before the widespread adoption of digital technology and has had to learn digital skills later in life, as opposed to a digital native who grew up immersed in technology. In accessibility research, older adults are often characterized as digital immigrants…

Digital Native

A person who grew up using digital technologies such as computers, the Internet, and mobile devices from an early age. Digital natives are presumed to have intuitive familiarity with digital interfaces and often learn new technologies through trial-and-error and exploration. The…

Digital Television(also: DTV, Digital TV, iTV)

Television broadcasting and receiving technology that uses digital signals rather than analogue, enabling additional features such as interactive services, electronic programme guides, on-demand content, and multiple channel packages. Digital television accessibility is a…

Digital divide(also: Digital gap, Digital inequality)

The disparity between individuals, households, or communities in access to, use of, and benefits from information and communication technologies. For older adults and people with disabilities, the digital divide encompasses not just access to hardware and internet connectivity,…

Driving Cessation(also: Driving Retirement, Giving Up Driving)

The process by which a person stops driving a motor vehicle, either voluntarily or due to age-related decline in cognitive, visual, or physical abilities, medical conditions, or legal restrictions. Driving cessation disproportionately affects older adults and has significant…

Enhanced Activities of Daily Living(also: EADLs, EADL (gerontology), Advanced Activities of Daily Living)

In gerontology and human-robot interaction research, the highest tier of everyday activities — higher-order social, recreational, and civic pursuits that enable full participation in society, such as using computers and the internet, volunteering, engaging in hobbies, pursuing…

Equal Error Rate(also: EER, Crossover Error Rate)

A metric used to evaluate biometric system performance, representing the point at which the false acceptance rate (wrongly accepting unauthorized users) equals the false rejection rate (wrongly rejecting authorized users). Lower EER values indicate better system accuracy. In…

Fall Detection(also: Automatic Fall Detection, Fall Alert System)

Technology that automatically identifies when a person has fallen and triggers an alert or emergency response. Fall detection systems typically use sensors such as accelerometers and gyroscopes in wearable devices (smartwatches, pendants), ambient sensors (radar, Wi-Fi), or…