Glossary

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Hand-Eye Coordination(also: Visual-Motor Coordination, Eye-Hand Coordination)

The ability to coordinate visual information with hand movements to perform tasks such as reaching, grasping, placing, and manipulating objects. For people with low vision, hand-eye coordination can be significantly affected by reduced visual acuity, contrast sensitivity, depth…

Hand-Eye Coordination(also: Visuomotor Coordination, Eye-Hand Coordination)

The ability of the visual system to coordinate information received through the eyes to control and guide hand movements in accomplishing tasks such as writing, catching a ball, or using a touchscreen. Research has shown strong correlations between hand-eye coordination,…

Hand-Object Interaction(also: Hand-Object Interactions, HOI)

The full range of physical actions people perform when grasping, touching, holding, manipulating, or gesturing toward objects with their hands. In accessibility research, hand-object interactions are studied as natural intent cues that can drive assistive technology: for blind…

Hand-Over-Hand Technique(also: Hand-Over-Hand Guidance, Hand-Over-Hand Training)

A training and communication method commonly used with individuals who are blind or have visual impairments, where a trainer places their hands over the learner's hands to physically guide them through the motions of a task. This technique allows the learner to feel the correct…

Hand-Under-Hand Technique(also: Hand-Under-Hand Guidance, Hand-Under-Hand Training)

A training and communication method used with individuals who are blind or have visual impairments, where the learner places their hands on top of the trainer's hands to feel the movements being demonstrated. Unlike hand-over-hand guidance where the trainer controls the…

Handicapping(also: Handicap System, Player Balancing)

A mechanism that asymmetrically adjusts game or contest conditions so competitors of differing ability have more equal chances to win or participate meaningfully. Long established in sports such as golf, horse racing, and archery, handicapping is distinct from matchmaking in…

Hands-Free Control(also: Hands-Free Interaction, Hands-Free Input)

Any method of operating a device or computer system that does not require the use of the hands or fingers. Hands-free control encompasses a range of input techniques including voice commands, eye tracking, head movements, sip-and-puff switches, foot controls, and EMG-based…

Hands-Free Interaction(also: Hands-Free Computing, No-Hands Input, Hands-free)

The ability to operate digital devices and interfaces without using the hands, typically through voice commands, eye tracking, head movements, foot controls, or brain-computer interfaces. Hands-free interaction is critical for users with upper limb motor impairments,…

Hands-Free Interface(also: Hands-Free Computing, Hands-Free Input)

A hands-free interface is a computer interaction system that does not require the use of hands or fingers, enabling users to control software through alternative input channels such as head movements, eye gaze, voice commands, foot pedals, or breath-controlled switches. These…

Handshape(also: Hand Configuration, Handform)

One of the five fundamental parameters of sign language phonology, referring to the specific configuration or shape of the hand(s) when producing a sign. Handshapes are a primary way signs are distinguished from one another and are commonly used as an organizational principle in…

Hapget(also: Haptically-Enhanced Widget)

A hapget (haptically-enhanced widget) is a user interface element that combines a 3D visual representation with haptic (touch) feedback, audio cues, and descriptive metadata to enable non-visual interaction. Introduced in the 3D HapticWebBrowser project, hapgets transform…

Haptic(also: Haptic feedback, Haptic interface)

Relating to the sense of touch as a means of interaction between a user and a device. Haptic interfaces include braille displays that raise and lower pins to represent text, vibration motors in mobile devices that provide tactile feedback, and specialised controllers that offer…

Haptic Communication(also: Social Haptics, Tactile Communication, Haptic Interaction)

A method of conveying information through touch-based signals, vibrations, or physical patterns on the body. Haptic communication is particularly important for individuals with deafblindness or other multisensory impairments, where visual and auditory channels are unavailable or…

Haptic Consent(also: Vibrotactile Consent)

A consent model in which the request for, agreement to, and revocation of consent are communicated through touch or vibration rather than speech. Haptic consent is motivated by accessibility: many neurodivergent people, Deaf and hard-of-hearing people, and people in high-emotion…

Haptic Controller(also: Haptic Interface, Tactile Controller)

An input device that uses touch-based interaction, typically through buttons, pads, or surfaces that can be pressed, tapped, or manipulated. In music technology, haptic controllers include devices like sample pads, drum machines, and synthesizer controllers that respond to…

Haptic Design(also: Vibrotactile Design, Haptic Authoring)

The practice of authoring haptic feedback - typically vibrations, forces, or temperature cues - so that it conveys intended meaning, emotion, or synchronicity with other media. Haptic design involves choosing signal parameters such as amplitude, frequency, timing, and spatial…

Haptic Device(also: Haptic Interface, Force-Feedback Device, Tactile Device)

A hardware device that provides tactile or force feedback to users, enabling them to feel virtual objects, textures, resistance, or vibrations. Haptic devices range from simple vibration motors in smartphones to sophisticated force-feedback systems like the Geomagic Touch…

Haptic Display(also: Tactile Display, Pin-Matrix Display, Refreshable Tactile Display)

A device that conveys information through the sense of touch by dynamically raising and lowering physical elements (typically pins) to create tactile patterns. In accessibility, haptic displays range from single-line refreshable Braille displays used with screen readers to large…

Haptic Experience Model(also: HX Model, HX)

A framework proposed by Kim and Schneider for evaluating user experience with haptic technologies along five perceptual-experiential dimensions: autotelics (the pleasantness of the sensation), realism (fidelity to the depicted phenomenon), harmony (fit with accompanying…

Haptic Exploration(also: Tactile Exploration, Touch Exploration)

The process of acquiring spatial and object information through systematic touch and hand movements. Haptic exploration involves active manipulation and movement across surfaces to perceive shape, size, texture, temperature, and spatial relationships. For people who are blind or…

Haptic Feedback(also: Tactile Feedback, Touch Feedback)

Information conveyed through the sense of touch, typically using vibrations, force, or texture changes to communicate data or system states to a user. In accessibility, haptic feedback provides non-visual, non-auditory confirmation of actions and can convey spatial information,…

Haptic Feedback(also: Tactile Feedback, Haptics)

Technology that communicates information through the sense of touch, using vibrations, pressure, or motion applied to the user's body. In accessibility, haptic feedback provides a non-visual, non-auditory channel for conveying alerts, navigation cues, or interface responses —…

Haptic Field of View(also: Tactile Field of View, Haptic Aperture)

The limited area that can be perceived through touch at any given moment, analogous to the visual field of view but much more restricted. While vision allows perception of an entire scene simultaneously, touch typically provides information only from the area directly under the…

Haptic Glove(also: Data Glove, Tactile Glove, Wearable Haptic Device)

A wearable device worn on the hand that provides tactile feedback through vibration motors, piezoelectric actuators, pin arrays, or other mechanisms embedded in the fingers and palm. In accessibility research, haptic gloves have been explored for several applications: enabling…

Haptic Graph(also: Haptic Chart, Force-feedback Graph)

A haptic graph is a non-visual rendering of a chart or graph — a bar chart, line graph, scatter plot, or mathematical function — that a blind or low-vision user explores by touch, typically through a force-feedback haptic device such as the PHANToM or a vibrotactile tablet.…

Haptic Graphics(also: Dynamic Tactile Graphics, Refreshable Haptic Graphics)

Graphical information presented through the sense of touch, typically on refreshable displays or touchscreen devices. Unlike static tactile graphics (embossed paper or thermoform), haptic graphics can change dynamically and often combine tactile feedback with audio cues. Modern…

Haptic Guiding(also: Force-Based Guiding, Haptic Navigation)

A collaborative interaction technique where one user physically guides another user's cursor or pointer through force feedback, allowing spatial information to be communicated through touch rather than verbal description. In inclusive group work, haptic guiding enables sighted…

Haptic Handle(also: Tactile handle)

A grip on a mobility or guidance device (robot, smart cane, haptic rein, etc.) that conveys information to the user through touch — typically via buttons, vibrotactile feedback, or physical coupling to the device's motion. On suitcase-shaped navigation robots for blind users, a…

Haptic Icon(also: Hapticon)

A short, structured vibrotactile or force pattern designed to carry meaning in the same way a graphical icon or audio earcon does, allowing users to recognize a category of information — an alert, material, identity, or state — through touch alone. The concept generalizes…

Haptic Input(also: Haptic Interaction, Touch Input)

Haptic input refers to interaction methods that use the sense of touch to communicate information between a user and a computer system. This includes devices such as data gloves, force-feedback controllers, and touch-sensitive surfaces that detect hand movements, gestures, and…

Haptic Interface(also: Haptic Device, Tactile Interface, Touch Interface)

An interface that communicates with users through the sense of touch, using vibrations, forces, or textures to convey information. Haptic interfaces can range from simple vibration motors in mobile devices to sophisticated force-feedback controllers and custom tactile displays.…

Haptic Magnetism(also: Force Attraction, Haptic Gravity)

A technique used in haptic interfaces where virtual attractive forces pull a haptic device (such as a stylus) toward nearby virtual objects, simulating a magnetic or gravitational effect. In accessible virtual environments, haptic magnetism helps blind users discover and reach…

Haptic Music Technology(also: Vibrotactile Music Systems, Haptic Music Interfaces)

Technologies that convey musical information through touch, typically using vibrotactile feedback to transmit sound properties such as rhythm, frequency, and amplitude to the body. Haptic music technology includes wearable devices like vibrotactile vests and jackets that allow…

Haptic Perception(also: Tactile Perception, Touch Perception)

The ability to perceive and interpret information through the sense of touch, including the detection of texture, shape, temperature, pressure, and vibration. Haptic perception is a primary information channel for blind and low vision people and is central to the use of…

Haptic Pointing Device(also: Force Feedback Mouse, Haptic Mouse, Force Feedback Pointing Device)

An input device that combines the pointing functionality of a mouse or stylus with the ability to generate physical forces that the user can feel through their hand. Unlike a standard mouse that provides no tactile information about screen content, a haptic pointing device can…

Haptic Rendering(also: Haptic display rendering)

The process of computing and outputting touch-based signals — forces, vibrations, textures, or friction — so that a user can perceive virtual or remote objects through the sense of touch. Haptic rendering covers kinesthetic rendering (force feedback via joysticks, exoskeletons,…

Haptic Technology(also: Haptics, Touch Technology)

Technology that creates tactile experiences through the application of forces, vibrations, or motions to the user, enabling interaction through the sense of touch. Haptic technologies range from simple vibration motors in smartphones to sophisticated force-feedback devices and…

Haptic Toolkit(also: Tactile Prototyping Toolkit)

A collection of physical materials designed to enable hands-on design and prototyping through touch rather than vision. In accessible design research, haptic toolkits are developed specifically for blind and low vision participants to create lo-fi prototypes of devices and…

Haptic User Interface(also: Haptic UI, Haptic Interface)

A user interface that communicates information through the sense of touch, enabling users to interact with virtual or digital objects by feeling their physical properties such as shape, texture, weight, temperature, and vibration. Haptic user interfaces typically employ…

Haptic Virtual Reality(also: Haptic VR, Feelable Virtual Environment)

Haptic virtual reality refers to virtual environments that incorporate touch-based feedback, allowing users to feel virtual textures, shapes, and objects through force-feedback devices. Unlike visual-only VR, haptic VR provides tactile and kinaesthetic information — resistance,…

Haptic Wearable(also: Haptic Wearable Device, Wearable Haptic Technology)

A body-worn electronic device that communicates information through touch sensations such as vibration, pressure, or temperature changes. In accessibility contexts, haptic wearables can serve as assistive technologies that convey information through tactile channels when visual…

Haptics(also: Haptic Technology, Haptic Feedback)

Technology that creates tactile sensations through vibrations, forces, or motions to simulate touch and physical interaction with digital content. In accessibility, haptics enables people who are blind or have low vision to perceive spatial information, navigate interfaces, and…

Hard of Hearing(also: HoH, HH)

A term describing people with hearing loss ranging from mild to severe who typically have some functional hearing, often with the assistance of hearing aids or other amplification devices. Unlike many Deaf individuals who identify with Deaf culture and use sign language, people…

Harm OCD(also: Harm Obsessions)

A subtype of OCD characterized by intrusive, unwanted thoughts about causing harm to oneself or others, despite having no desire or intention to act on these thoughts. People with harm OCD may experience distressing mental images of violence, fear that they might lose control…

Harm Reduction

An approach that prioritizes minimizing negative consequences of potentially risky behaviors rather than demanding complete abstinence or compliance with prescribed rules. In accessibility and disability contexts, harm reduction acknowledges that disabled people often face…

Hate Speech

Hate speech refers to expression that attacks, demeans, or calls for violence or discrimination against individuals or groups based on protected characteristics such as race, ethnicity, religion, national origin, gender, sexual orientation, or disability status. On digital…

Head Control(also: Head-Controlled Interface, Head Mouse, Head Pointer)

An alternative computer input device that translates head movements into cursor movements on screen, enabling people who cannot use their hands or arms to operate a computer. Head control systems typically use ultrasonic sensors, infrared tracking, or camera-based systems to…

Head Pointer(also: Head Mouse, Head Tracking Device)

An assistive technology input device that translates head movements into cursor movements on screen, allowing people who cannot use their hands or arms to control a computer. Head pointers can be physical devices (a stick or stylus mounted on a headband used to press keys) or…

Head Pointing(also: Head-Controlled Pointing, Head Mouse)

Head pointing is an alternative input method that maps head movements to cursor position on a computer screen, enabling hands-free mouse control. The user moves their head to direct the cursor, with the system translating head orientation or position into screen coordinates.…

Head Pose Estimation(also: Head Orientation Detection, Gaze Direction Estimation)

A computer vision technique that determines the orientation or direction a person's head is facing, typically classifying whether someone is looking towards or away from the camera. In accessibility contexts, head pose estimation can help blind users determine whether a passerby…