Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users
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Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users

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Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users Presentation Transcript

  • Investigating the Effectivenessof Assistive Technologies onSituationally Impaired UsersDavid LucasHugo NicolauTiago GuerreiroJoaquim Jorge
  • Evolution …
  • On the move View slide
  • Always near us View slide
  • @ Home
  • @ Work
  • Outdoors
  • In car
  • @ Coffee shop
  • @ Subway
  • Many contexts CONTEXT
  • Leading to … SIID Situationally-Induced Impairments and Disabilities
  • VisualAttention
  • “Functionally Blind”
  • Technology transfer
  • Not quite the same
  • Yet, very similar
  • Text-entry
  • Screen Readers
  • VoiceOver
  • NavTouch [Guerreiro, 2008]
  • User Evaluation
  • 23 Participants
  • 18 ~ 37 years old
  • Touchscreen experience
  • Texting experience
  • Apparatus
  • Text-entry Methods QWERTY VoiceOver NavTouch
  • Visual Feedback NavTouchQWERTY
  • Mobility conditions seated corridor navigation
  • Five word sentences 97% correlation
  • Measurements and Design Words per Minute Error rate Minimum String Distance (MSD) Error Rate Preferred Walking speed
  • Text-entry speed 25 20 15 10 5 0 seated corridor navigation Qwerty VoiceOver NavTouch
  • Text-entry speed Text-entry sensitive to visually demanding conditions AT were inefficient regarding speed QWERTY the most sensitive (3.4 wpm)
  • Error Rate 18% 16% 14% 12% 10% 8% 6% 4% 2% 0% seated corridor navigation Qwerty VoiceOver NavTouch
  • Error Rate More deletions with QWERTY Fewer errors with Assistive Technologies?
  • Quality of Text 6% 5% 4% 3% 2% 1% 0% seated corridor navigation Qwerty VoiceOver NavTouch
  • Quality of Text NavTouch the most erroneous Audio feedback improves quality of text QWERTY the most sensitive
  • Walking Speed 80% 70% 60% 50% 40% 30% 20% 10% 0% corridor navigation Qwerty VoiceOver NavTouch
  • Walking Speed Navigation course was more demanding Users decreased walking speed ATs were ineffective, possibly due to cognitive load
  • Conclusion Users reduce walking speed due to visual demand QWERTY outperformed ATs ATs are cognitively demanding Audio is overlooked when visual feedback is available
  • Future workMore visually demandingconditions1-step selection methodsNo visual feedbackPlay with visual attributes
  • THE END.Tiago Guerreirotjvg@vimmi.inesc-id.pt