Text Entry via Character Stroke Disambiguation for an Adolescent With Severe Motor Impairment and Cortical Visual Impairment

Brian Leung, Madeleine Yates, Pierre Duez, Tom Chau

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    This study proposed a single-switch text entry system by hierarchical scanning of character strokes for an 11-year-old girl with severe physical disabilities and low vision. She could only perceive magnified straight line segments and chords presented against high-contrast, colored backgrounds. In a descriptive case study, the participant used the proposed system in the community for 8 months. Assessment included theoretical evaluation of text entry performance and empirical evaluation of the participant's proficiency. The proposed system had a lower error-free text entry rate but comparable proneness to user error as a real-world implementation of row-column virtual scanning keyboard with character frequency layout. The participant's proficiency, in terms of mean number of single-switch activations and time to type one character, showed statistically significant improvements as the case study progressed. The proposed system feasibly addressed the participant's typing needs, in a context where traditional row-column scanning and codeword-based text entry systems were not successful.

    Original languageEnglish
    Pages (from-to)223-235
    Number of pages13
    JournalAssistive Technology
    Volume22
    Issue number4
    DOIs
    Publication statusPublished - Dec 2010

    Keywords

    • cerebral palsy
    • character stroke disambiguation
    • cortical visual impairment
    • single-switch scanning
    • text entry

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