From the strokes, he has complications with mobility, and a lower speed of cognitive processing, but no difficulty speaking.

CNN: Healing touch of family, friends aids recovery

For example, one day we might be able to design apps that allow people to probe their own cognitive abilities (processing speed, memory, decision-making, etc.) at any time during the day and track these abilities over the years, transmitting the results from their smartphones to a health care provider if desired.

CNN: How mobile tech can influence our brain

Researchers tested participants for their cognitive abilities by administering standardized tests of memory, information processing, and thought organization.

CNN: Study: Childhood cancer survivors less likely to marry