Table 1 Selected qualitative feedback (pros and cons) from participants.
From: Validating an infrared thermal switch as a novel access technology
| Â | Infrared Thermal Switch | Chin Switch |
|---|---|---|
| Â | Flexibility: switch works even in spite of user body motion and head rotation (as long as user face is in camera's field of view) | Instantaneous activation |
Pros's | Non-contact | More sensitive switch |
| Â | Possible to activate the switch with closed eyes | Â |
| Â | Reduced detection sensitivity immediately after taking cold drink or food (this problem is alleviated with time) | Low detection sensitivity due to considerable head rotation or change of posture |
Con's | Reduced detection sensitivity if too much saliva in the mouth (this problem is alleviated with one swallow) | Too many false positives due to small head motion, talking or any activity that makes the chin touch the switch |
| Â | Prolonged periods of switch operation may cause fatigue or jaw pain | May cause infection if it enters user mouth May cause skin irritation |