Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users
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Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users
- 1. Investigating the Effectiveness of Assistive Technologies on Situationally Impaired Users David Lucas Hugo Nicolau Tiago Guerreiro Joaquim Jorge
- 2. Evolution …
- 3. On the move
- 5. @ Home
- 6. @ Work
- 7. Outdoors
- 8. In car
- 10. @ Subway
- 11. Many contexts CONTEXT
- 12. Leading to … SIID Situationally-Induced Impairments and Disabilities
- 13. Visual Attention
- 16. Not quite the same
- 18. Text-entry
- 19. Screen Readers
- 20. VoiceOver
- 21. NavTouch [Guerreiro, 2008]
- 22. User Evaluation
- 23. 23 Participants
- 24. 18 ~ 37 years old
- 27. Apparatus
- 28. Text-entry Methods QWERTY VoiceOver NavTouch
- 29. Visual Feedback NavTouch QWERTY
- 30. Mobility conditions seated corridor navigation
- 31. Five word sentences 97% correlation
- 32. Measurements and Design Words per Minute Error rate Minimum String Distance (MSD) Error Rate Preferred Walking speed
- 33. Text-entry speed 25 20 15 10 5 0 seated corridor navigation Qwerty VoiceOver NavTouch
- 34. Text-entry speed Text-entry sensitive to visually demanding conditions AT were inefficient regarding speed QWERTY the most sensitive (3.4 wpm)
- 35. Error Rate 18% 16% 14% 12% 10% 8% 6% 4% 2% 0% seated corridor navigation Qwerty VoiceOver NavTouch
- 36. Error Rate More deletions with QWERTY Fewer errors with Assistive Technologies?
- 37. Quality of Text 6% 5% 4% 3% 2% 1% 0% seated corridor navigation Qwerty VoiceOver NavTouch
- 38. Quality of Text NavTouch the most erroneous Audio feedback improves quality of text QWERTY the most sensitive
- 39. Walking Speed 80% 70% 60% 50% 40% 30% 20% 10% 0% corridor navigation Qwerty VoiceOver NavTouch
- 40. Walking Speed Navigation course was more demanding Users decreased walking speed ATs were ineffective, possibly due to cognitive load
- 41. Conclusion Users reduce walking speed due to visual demand QWERTY outperformed ATs ATs are cognitively demanding Audio is overlooked when visual feedback is available
- 42. Future work More visually demanding conditions 1-step selection methods No visual feedback Play with visual attributes