Our expert says:
Both. There are many different forms of head injury, which can cause differnt types of damage, temporary or permanent, to different areas of the brain --- and as different brain areas have different functions, the effects of such damage will vary. Then too our heads vary and some seem to withstand injury better than others --- some of us, for instance, have a thinner or more brittle skull ; and then the state of the brain itself, and whether it has been damaged before ( and then in what way ) will also affect the outcome. Complex.
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