Glossary

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Gait(also: 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. Gait analysis is important in accessibility and rehabilitation because many…

Gaze Interaction(also: Gaze-Based Interaction, Gaze Input, Eye Gaze Control)

Gaze interaction is a method of controlling computers and devices by tracking where a person is looking on the screen. Using eye-tracking technology, the system detects the user's point of gaze and translates it into cursor movement or selection actions, often combined with…

Gestural Interaction(also: 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, or depth sensors. Gestural interaction supports hands-free or low-force control…

Gesture Elicitation(also: User-Defined Gestures)

Gesture elicitation is a participatory design method where end users are asked to invent gestures for a set of device functions, rather than having gestures predetermined by designers or engineers. Participants are shown the effect of an action (such as zooming in) and asked to…

Gesture Interaction(also: 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, pointing devices, or touchscreens. Gesture interaction underpins many augmented…

Gesture Recognition Threshold(also: 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 finger positions, distances between fingertips, hand openness levels, and…

Gesture-based interaction(also: Gestural interface, Touchless interaction)

An interaction modality where users control technology through body movements, hand gestures, or postures detected by sensors such as depth cameras, rather than through traditional input devices like keyboards, mice, or touchscreens. Gesture-based interaction can benefit people…

Ghost Cursor(also: 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, typically aligned in a row or column, allowing users to quickly specify an…

Goal Crossing(also: 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 motor impairments by reducing the precision demands of target acquisition—users…

Gorilla Arm Syndrome(also: 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 and has become particularly relevant in virtual and mixed reality, where users…

Gravity Well(also: Target Attraction, Sticky Targets, Snap-to-Target)

An interaction filtering technique that warps the cursor space around interactive targets (such as buttons or links), creating attractive basins that pull the cursor toward the nearest target. This makes it easier for users with motor impairments to select small or distant…

Grid-Based Cursor Control(also: 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 until the desired target is reached. Grid-based approaches reduce the vocabulary…

Grid-Based Navigation(also: 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 target location. This alternative input method enables people with upper-body…

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