Multimodal 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 sequentially. For people with motor impairments, multimodal input serves two key purposes: redundancy, where multiple methods can accomplish the same task (providing backup when one modality fails or physical abilities change), and variability, where different input methods handle different sub-tasks within a larger activity (e.g., using eye gaze to target an object and voice to issue a command). Multimodal input systems can adapt to diverse and changing physical abilities, environmental contexts, and social situations, supporting greater independence in activities of daily living.