Obviously the studies aren't definitive, but if they were and multitasking caused me to be less intelligent and less able to focus due to "permanent physiological changes in the brain", I would consider my brain to be damaged regardless of whether it meets the literal medical definition of brain damage.
Obviously the studies aren't definitive, but if they were and multitasking caused me to be less intelligent and less able to focus due to "permanent physiological changes in the brain", I would consider my brain to be damaged regardless of whether it meets the literal medical definition of brain damage.