There are no studies I have seen. A medical school professor who used to post his lectures online addressed these issues.

The anecdotal evidence suggests this to be a common issue. The medical industry is not completely behind this but the chiropractic and osteopath professions try to address these issues.

Common logical understandings of anatomy and physiology suggest this is the case. It is well known that excessive pressure in the brain can cause cognitive and memory problems. That is why the MMSE (Mini Mental Status Exam) is used to diagnose neurological condition.

A webinar put on by Headway Foundation addressed upper neck issues this past Thursday but I missed the presentation.

Why do you need to have such specific information?