In the second part, another 59 subjects, wearing eye-tracking devices, watched short video clips of the problem-solving exercise.

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"A developer needs to really understand the problems you're solving to exercise good judgment when coding the application, " says Mr. Bell.

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Ms. Crowe receives regular home visits from occupational and physical therapists, who work with her on puzzles, problem-solving games and exercise, including walking, stretching, leg exercises and light weights.

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Self-measurement used to be difficult and expensive but technologists have started solving these issues: leaders include FitBit and Zeo for sleep measurement, RunKeeper for exercise tracking and Withings for weight management.

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