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Using tactile features to help functionally blind individuals denominate banknotes.

Susan J Lederman1, Cheryl Hamilton

  • 1Department of Psychology, Queen's University, Kingston, ON, Canada. lederman@psyc.queensu.ca

Human Factors
|December 28, 2002
PubMed
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New Canadian banknotes will include raised texture features, enabling blind individuals to identify currency by touch. This tactile denomination system achieved high accuracy and efficiency in user testing.

Area of Science:

  • Human-Computer Interaction
  • Accessibility Design
  • Currency Engineering

Background:

  • Banknotes require clear denomination identification for all users.
  • Visually impaired individuals face challenges in independently identifying currency.
  • Existing currency lacks tactile features for denomination recognition.

Purpose of the Study:

  • To assess the feasibility of incorporating raised texture features and tactile denomination codes on Canadian banknotes.
  • To enable functionally blind individuals to independently denominate banknotes.
  • To evaluate the effectiveness of tactile features for currency identification.

Main Methods:

  • Conducted two experiments with sighted and functionally blind participants.
  • Tested 8 alternate tactile feature designs for banknote denomination.

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  • Measured accuracy (proportion of correct responses) and response time per banknote.

    • Main Results:

    • Sighted participants achieved over 97% accuracy with tactile features.
    • Functionally blind participants achieved over 92% accuracy.
    • Mean response times ranged from 11.4 to 13.1 seconds across experiments.

    Conclusions:

    • Raised texture features are a feasible and effective method for tactile banknote denomination.
    • The Bank of Canada selected a tactile design for the new banknote series.
    • This technology has potential applications in haptic displays for teleoperation and virtual environments.