Glossary

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Multi-Sensory Environment(also: MSE, Snoezelen, Multisensory Room)

A specially designed space that combines sensory stimuli — such as lighting, sound, textures, and aromas — to provide therapeutic, calming, or stimulating experiences for people with disabilities. Originally developed in the Netherlands under the name Snoezelen, multi-sensory…

Multi-Sensory Feedback(also: Multimodal Feedback, Cross-Modal Feedback)

The simultaneous or coordinated use of multiple sensory channels—such as audio, haptic, visual, and sometimes olfactory or thermal—to convey information to a user. Multi-sensory feedback is a key accessibility strategy because it ensures that information is not conveyed through…

Multi-touch Interaction(also: Multi-touch Input, Multi-touch Gestures)

An input method where a touchscreen or trackpad recognises two or more simultaneous points of contact, enabling gestures such as pinching, rotating, and swiping with multiple fingers. In accessibility contexts, multi-touch interaction is significant both as a challenge and an…

Multilingual AAC(also: Multilingual Communication Device)

Augmentative and alternative communication systems designed to support communication in multiple languages, reflecting the linguistic diversity of users and their communication partners. Multilingual AAC is particularly important in the Global South, where multilingualism is…

Multimodal(also: Multimodal Interaction, Multimodal Interface)

Relating to communication or interaction that uses multiple sensory channels or modes simultaneously, such as vision, hearing, touch, and speech. In accessibility, multimodal approaches are essential for making information available to people who cannot access one or more…

Multimodal AI(also: Multimodal Generative AI)

Artificial intelligence systems capable of processing and generating content across multiple modalities such as text, images, audio, and video. In accessibility contexts, multimodal AI is significant because a single tool can address diverse access needs — for example,…

Multimodal Alert System(also: Multi-Sensory Alert, Multimodal Notification)

A notification system that communicates alerts through multiple sensory channels simultaneously, such as combining audio, visual, and haptic signals. Multimodal alert systems are critical for accessibility because they ensure people with different sensory abilities can perceive…

Multimodal Assistive Technology(also: MAT, Multimodal AT)

Assistive technology that combines multiple sensory channels — such as audio, vibrotactile (vibration), visual, and tactile feedback — to convey information and enable interaction. By distributing information across different sensory modalities, multimodal assistive technologies…

Multimodal Communication(also: Multi-Modal Communication)

The use of multiple channels and resources simultaneously during interaction, including speech, gesture, gaze, facial expression, body movement, writing, drawing, and physical artifacts. All human communication is inherently multimodal, but this concept is especially significant…

Multimodal Cueing

Multimodal cueing is the simultaneous or selectable use of two or more sensory channels - typically visual, auditory, and somatosensory (vibrotactile) - to guide motor behaviour during rehabilitation or assistive interaction. The rationale is that different modalities engage…

Multimodal Feedback(also: Multi-Sensory Feedback)

The simultaneous or coordinated use of multiple sensory channels — such as auditory, tactile, and visual — to convey information to a user. In accessibility, multimodal feedback is essential for creating inclusive interfaces that do not rely on a single sense. Combining audio…

Multimodal Input(also: Multimodal Interaction, Multi-modal Input)

An interaction approach that allows users to communicate with computing devices or systems through multiple input channels — such as touch, voice, eye gaze, head movement, facial expressions, hand gestures, brain-computer interfaces, and biometrics — either simultaneously or…

Multimodal Instruction(also: Multimodal Feedback, Multimodal Learning)

An instructional approach that combines two or more sensory modalities - such as verbal narration, non-verbal sound, haptic or tactile feedback, and visual demonstration - to convey information. In accessibility, multimodal instruction is used to replace or supplement…

Multimodal Interface(also: Multimodal Interaction, Multi-Modal UI)

A multimodal interface is a system that communicates with users through multiple sensory channels simultaneously, such as speech, haptic feedback, sound, vibration, and visual output. In accessible navigation and assistive technology, multimodal interfaces are critical because…

Multimodal Large Language Model(also: MLLM, Vision-Language Model, VLM)

A deep learning model that can process and generate content across multiple types of input including text, images, audio, and video. In accessibility contexts, MLLMs like GPT-4o, Gemini, and Claude have become transformative tools for blind and low vision users, enabling…

Multimodal Map(also: Audio-Tactile Map, Interactive Tactile Map)

A map that conveys spatial information through multiple sensory channels simultaneously, typically combining tactile elements with audio output and sometimes visual or haptic feedback. Multimodal maps are designed to make geographic and spatial information accessible to people…

Multimodal Output(also: Multi-Modal Output, Cross-Modal Output)

The simultaneous presentation of information through multiple sensory channels or formats, such as audio, visual, tactile, and text-to-speech, allowing users to choose the modality or combination of modalities that best suits their abilities and preferences. In accessible…

Multimodal Text Editing(also: Multimodal Editing)

A text editing approach that combines multiple input modalities—such as gestures, voice commands, and touch—to enable more efficient and accessible text correction. For users with disabilities, multimodal editing can reduce reliance on any single input method, allowing each…

Multiple Disabilities(also: Multi-impairment, Multiple Impairments, Combined Disabilities)

The presence of two or more disabilities in the same individual, such as combined motor and visual impairments, or deafblindness. People with multiple disabilities often face compounded accessibility barriers because assistive technologies and accessibility features are…

Multiple Impairments(also: Multiple Disabilities, Complex Disabilities, Co-occurring Impairments)

The presence of two or more concurrent impairments — such as sensory, cognitive, physical, or neurological — in a single individual that together create complex accessibility needs not adequately addressed by solutions designed for any single impairment alone. Research shows…

Multisensory Interface(also: Multimodal Interface, Multi-Sensory Feedback)

An interface that communicates information through multiple sensory channels simultaneously, such as visual, auditory, and tactile (haptic) feedback. Multisensory interfaces are particularly valuable in accessibility because they reduce dependence on any single sense, allowing…

Multitouch Surface(also: Multi-Touch Interface, Multitouch Interface, MTS)

A multitouch surface is an input device that uses optical or capacitive sensors to detect and track multiple simultaneous finger contacts on a flat surface. Unlike conventional touchpads that rely on a single finger for functionality, multitouch surfaces can recognize complex…

Muscle Contraction(also: Voluntary Muscle Activation)

The deliberate tensing of a muscle group that generates an electrical signal (electromyographic or EMG signal) detectable by surface electrodes. In assistive technology, intentional muscle contractions serve as input signals for controlling devices when traditional input methods…

Muscle-Computer Interface(also: MCI (Muscle-Computer Interface), EMG Interface)

An input modality in which signals generated by muscle contractions — typically recorded via surface electromyography (sEMG) sensors worn on the forearm or other muscle group — are interpreted by a computer to recognise discrete gestures or continuous control signals. Coined by…

Music Braille(also: Braille Music, Braille Music Notation)

A tactile music notation system that uses combinations of braille dots to represent musical elements including pitch, duration, dynamics, tempo markings, and other performance instructions. Music braille allows blind and low-vision musicians to read musical scores through touch.…

Music Haptics(also: Musical Haptics, Haptic Music)

The use of touch-based feedback — including vibrations, textures, and force — to convey musical information such as pitch, tempo, timbre, articulation, dynamics, and rhythm. Music haptics draws on the fact that haptic receptors in the skin, muscles, and joints naturally relay…

Music Notation(also: Musical Notation, Sheet Music)

A system of written symbols used to represent musical sounds, including pitch, rhythm, dynamics, and other performance instructions. Standard visual music notation uses staff lines, notes, and other graphical symbols that are inherently visual. For blind and visually impaired…

Music Visualisation(also: Music Visualization, Sound Visualisation, Audio Visualisation)

The representation of musical or audio content through visual media such as drawings, animations, colour changes, or motion graphics. Music visualisation is an important accessibility strategy for deaf and hearing-impaired people, enabling them to perceive and engage with…

Mutual Support(also: Mutual support in HRI, Mutual assistance)

In accessibility and human-robot interaction research, a framing that moves beyond one-way robot-supports-user or user-supervises-robot models toward a bidirectional relationship in which each party compensates for the other's limitations. For a blind user travelling with an…

Myo Armband(also: Thalmic Myo)

A commercially available wearable gesture-recognition armband released by Thalmic Labs in 2014 and discontinued in 2018, containing eight dry sEMG electrodes sampling at 200 Hz plus a 9-axis IMU. Despite its discontinuation, the Myo remains widely used in accessibility and HCI…

Myoelectric Control

The use of electromyographic (EMG) signals from voluntary muscle contractions as control inputs for external devices, most commonly powered upper-limb prostheses but also exoskeletons, wheelchairs, and general computer input. Traditional myoelectric control uses direct mappings…

N-gram(also: Bigram, Trigram, Unigram)

A contiguous sequence of n items (typically words) from a text, used in language modeling to predict the probability of a word based on its predecessors. A unigram considers single words in isolation, a bigram considers pairs of consecutive words, and a trigram considers…

NFC(also: Near Field Communication)

A short-range wireless communication technology that enables data exchange between devices held within a few centimetres of each other. NFC is built into most modern smartphones and can read passive NFC tags embedded in objects. In accessibility applications, NFC tags can be…

NFC Tag(also: Near Field Communication Tag, NFC)

An NFC (Near Field Communication) tag is a small, unpowered chip that can transmit data to a compatible smartphone or device when held within a few centimeters. In accessibility contexts, NFC tags are used in museums, galleries, and public spaces to provide on-demand information…

NFC accessibility(also: NFC tags for accessibility)

The use of Near Field Communication (NFC) technology to make physical objects, materials, and environments accessible to people with disabilities. NFC tags can be embedded in physical cards, objects, or locations and triggered by tapping a smartphone or dedicated reader to…

NVDA(also: NonVisual Desktop Access)

A free, open-source screen reader for Windows developed by NV Access. NVDA provides speech and braille output, enabling blind and low-vision users to interact with the operating system, web browsers, and applications. Since its release in 2006, NVDA has become one of the most…

NVDA(also: NonVisual Desktop Access)

A free, open-source screen reader for Microsoft Windows developed by NV Access. NVDA enables people who are blind or have low vision to use computers by reading on-screen text aloud through a speech synthesizer or outputting to a refreshable Braille display. As open-source…

Narrative Route Description(also: Verbal Route Guidance, Turn-by-Turn Narrative)

A structured verbal representation of a travel route that guides users through sequential steps using spoken or text-based instructions. Effective narrative descriptions for blind travelers typically follow a consistent format: action to take, distance information, then landmark…

Narrator(also: Windows Narrator)

The built-in screen reader included with Microsoft Windows operating systems. Narrator reads aloud text on screen, describes notifications and interface elements, and allows users to navigate Windows and applications using keyboard commands. First introduced in Windows 2000 as a…

Natural Language Generation(also: NLG, Text Generation)

A subfield of artificial intelligence and computational linguistics focused on automatically producing human-readable text from structured data or other non-linguistic representations. In accessibility, natural language generation is used to create textual descriptions of visual…

Natural Language Interface(also: NLI, Natural Language User Interface)

A user interface that allows people to interact with technology using everyday language rather than specialized commands, menus, or graphical controls. Natural language interfaces can improve accessibility by reducing the learning curve for technology use, supporting users with…

Natural Language Processing(also: NLP, Computational Linguistics)

A branch of artificial intelligence that enables computers to understand, interpret, and generate human language. In accessibility, NLP powers voice-based assistive technologies, automatic captioning, text simplification for cognitive accessibility, and natural language query…

Natural Language Understanding(also: NLU, Intent Recognition, Language Understanding)

A branch of artificial intelligence that enables computers to interpret the meaning and intent behind human language input, rather than requiring exact predetermined phrases or commands. In accessibility contexts, NLU is valuable for voice-controlled interfaces because it allows…

Natural Speech Output(also: Recorded Speech, Digitized Speech)

Speech output produced from digital recordings of actual human speakers, as opposed to artificially generated synthetic speech. Natural speech output preserves the prosody, intonation, emotion, and vocal quality of the original speaker, making it generally more pleasant and…

Natural User Interface(also: NUI)

A user interface designed to feel intuitive and invisible, allowing users to interact with technology through natural behaviors such as gestures, voice, touch, or body movement rather than learned conventions like mouse clicks or keyboard commands. NUIs are particularly valuable…

NavCog(also: Navigational Cognitive Assistant)

A Bluetooth beacon-based navigation system developed at Carnegie Mellon University that provides indoor turn-by-turn navigation assistance and environmental information to blind and visually impaired users via smartphone. NavCog works by detecting BLE (Bluetooth Low Energy)…

NavTap

A navigational text-entry method designed for blind mobile phone users that reduces the cognitive load associated with inputting text without visual feedback. NavTap organizes the alphabet into five rows beginning with vowels and allows users to navigate between letters using…

Navigation

The task of moving through an environment to reach a destination, encompassing route planning, mode selection, real-time decision-making, and responding to obstacles. In accessibility research, navigation is often paired with wayfinding (the embodied, situated practice of…

Navigation Axis(also: Multi-Axial Navigation, Axis-Based Navigation)

A navigation axis is a concept from screen reader research describing a specific linear serialization of a subset of web page elements that represents one navigation strategy. Rather than forcing blind users through a single reading order (the DOM order), a multi-axial…

Navigation Robot(also: Guide Robot, Autonomous Navigation Robot)

A robotic system designed to guide users through physical spaces, providing wayfinding assistance and contextual information. In museum contexts, navigation robots can lead visually impaired visitors between exhibits, reduce the cognitive load of independent navigation, and…