Glossary
Searchable terminology from accessibility, web standards, and related fields.
93 results found in Motor Accessibility.
- EyeDraw (Eye Draw)
- A software application developed at the University of Oregon that enables people with severe motor impairments, particularly children, to create freehand drawings using eye movements tracked by an eye…
- False Activation (Accidental Activation, Unintended Gesture)
- An interaction error in gesture-based systems where the system incorrectly interprets a user's resting hand position or unintentional movement as a deliberate input command. In virtual reality, false …
- Fitts' Law (Fitts Law)
- A predictive model of human movement that describes the time required to move to a target as a function of the target's size and distance from the starting point. Formulated by Paul Fitts in 1954, the…
- Form Factor (Device Form Factor, Handset Form Factor)
- Form factor refers to the overall physical size, shape, weight, and mechanical configuration of a device — for mobile phones this includes distinctions like candy-bar, clamshell (flip), slide-out keyb…
- Fractionation (Finger Fractionation, Finger Independence)
- The ability to move individual fingers independently of one another, a key measure of fine motor control assessed in stroke rehabilitation. After a stroke, patients often lose fractionation, meaning t…
- Freehand Gesture Interaction (Hand Tracking Interaction, Controller-Free Interaction)
- An input method for virtual and mixed reality systems that uses camera-based hand tracking to detect and interpret natural hand movements without requiring physical controllers. Freehand gestures such…
- Functional Near-Infrared Imaging (fNIR, fNIRS, Functional Near-Infrared Spectroscopy)
- A neuroimaging technique that measures brain activity by detecting changes in oxygenated blood volume using near-infrared light transmitted through the skull. In accessibility contexts, fNIR enables b…
- Gait (Walking Pattern, Locomotion Pattern)
- The pattern of movement during walking, characterized by measurable parameters including walking velocity, cadence (steps per minute), step length, stride length, step time, cycle time, and swing time…
- Gestural Interaction (Gesture-Based Interaction)
- A mode of human-computer interaction in which users control systems through movements of the body — hands, arms, head, eyes, or whole body — captured by sensors such as accelerometers, cameras, IMUs, …
- Gesture Interaction (Gesture-based interaction, Gestural interfaces)
- An input modality in which users control digital systems through hand, arm, or body movements detected by cameras, depth sensors, IMUs, or wearable devices rather than through traditional keyboards, p…
- Gesture Recognition Threshold (Activation Threshold, Gesture Detection Threshold)
- The predefined parameters that a gesture recognition system uses to determine whether a user's hand movement constitutes a valid gesture input. These thresholds specify requirements such as the exact …
- Ghost Cursor (Phantom Cursor, Proxy Cursor)
- A visual indicator displayed on screen that shows a potential cursor position, used in speech-based and alternative cursor movement systems. Multiple ghost cursors can be displayed simultaneously, typ…
- Goal Crossing (Crossing-Based Input, Crossing Interface)
- An input technique where users select targets by moving through a boundary line rather than clicking within a target area. Research shows goal crossing can improve input performance for people with mo…
- Gorilla Arm Syndrome (Gorilla Arm, Gorilla Arm Effect)
- Fatigue, pain, and discomfort in the arms and shoulders caused by prolonged use of interfaces that require sustained arm elevation without support. The term originates from early touchscreen computing…
- Grid-Based Cursor Control (Grid-Based Navigation, Grid Overlay Navigation)
- A hands-free cursor positioning technique that overlays a numbered grid on the screen, allowing users to select a cell by voice command or other input to recursively zoom into smaller screen regions u…
- Grid-Based Navigation (Grid Navigation, Grid Cursor Control)
- A speech-controlled cursor positioning technique that divides the screen into numbered regions, allowing users to select progressively smaller areas by speaking numbers until the cursor reaches the ta…
- Hands-Free Interface (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,…
- Head Control (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 typi…
- Head Pointing (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 t…
- Heisenberg Effect (Heisenberg Problem)
- In human-computer interaction, a spatial interaction problem where the act of making a selection disrupts the positional accuracy of the cursor or pointer. In virtual reality freehand gesture contexts…