Glossary

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Paraplegia

A condition resulting from injury to the thoracic, lumbar, or sacral segments of the spinal cord, causing partial or complete loss of motor function and sensation in the legs, pelvis, and trunk while arm and hand function is preserved. People with paraplegia can typically use…

Parkinsonian Tremor(also: Rest Tremor, Parkinson Tremor)

Parkinsonian tremor is an involuntary, rhythmic shaking that occurs primarily at rest and is associated with Parkinson's disease. It is caused by the reciprocal activation of antagonistic muscle groups and typically has a frequency of 4-6 Hz with a harmonic frequency…

Peak Velocity

The maximum speed reached by a cursor or limb during a directed movement toward a target. In human-computer interaction research, peak velocity is a key metric for understanding pointing performance, typically occurring in the first quarter of a movement. Peak velocity decreases…

Pen Input(also: Stylus Input, Pen-Based Input)

An input method using a pen or stylus to interact with a computing device, typically through direct manipulation on a touchscreen or digitizer. Pen input offers advantages for users with certain motor impairments: compared to mice, pens allow users to leverage hand-eye…

Peripheral Neuropathy(also: Neuropathy)

Peripheral neuropathy is a condition resulting from damage to the peripheral nerves, which carry signals between the brain, spinal cord, and the rest of the body. Symptoms typically include numbness, tingling, weakness, and pain, most commonly in the hands and feet. For…

Pie Menu(also: Radial Menu, Circular Menu)

A pie menu is a circular or ring-shaped menu interface in which command options are arranged radially around a central point, allowing selection by moving the cursor or making a directional gesture toward the desired item. Unlike linear drop-down menus, pie menus leverage…

Point-and-Click(also: Point and Click, Click Target)

A fundamental interaction paradigm in graphical user interfaces where the user moves a cursor to a target on screen and activates it by pressing a button on a pointing device such as a mouse or trackpad. Point-and-click tasks are central to GUI-based computing but present…

Pointer Speed(also: Mouse Gain, Cursor Speed, Mouse Speed)

An operating system setting that controls how far the cursor moves on screen relative to physical movement of the mouse or pointing device. Higher pointer speed (gain) means less physical movement is required to traverse the screen, while lower speed provides finer control but…

Pointing(also: Pointing Performance, Mouse Pointing, Cursor Pointing)

The act of moving a cursor or pointer to indicate a specific location on screen, typically to select, activate, or interact with an interface element. Pointing is a fundamental computer interaction that can be challenging for individuals with motor impairments, tremors, limited…

Pointing Device(also: Pointer Device, Input Device)

Any hardware device used to control the movement of a cursor or pointer on a computer screen, enabling users to select, click, drag, and interact with interface elements. Common pointing devices include the mouse, trackball, trackpad, touchscreen, stylus, joystick, head-tracking…

Pointing Device Gain(also: Control-Display Gain, Mouse Sensitivity, Pointer Speed)

The ratio between the movement of a physical input device (such as a mouse or trackball) and the resulting movement of the cursor on screen, typically measured in pixels per inch of device movement. Higher gain means the cursor moves further for a given physical movement. In…

Predictive Cursor(also: Anticipatory Cursor, Offset Cursor)

A cursor display technique designed to compensate for the delays inherent in speech-based or other high-latency input methods. A predictive cursor shows an indicator ahead of the actual cursor position, offset by the estimated distance the cursor will travel during the input…

Programming Accessibility(also: Accessible Programming, Accessible IDE)

The practice of making software development tools, environments, and workflows usable by programmers with disabilities. Programming presents unique accessibility challenges beyond general computer use: code requires precise typing of special characters and symbols, specific…

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