Several clinical studies document a reduced local blood flow in the brains occipital lope after whiplash injury (that is the top rare end of the brain, above the cerebellum).
Should you or your medical doctor find it interesting to know more; here is a link to the abstract of the Linnman study at PubMed. The study was part of Linnmans WHIPLASH-PhD in Sweden. Today he is a brain scientist in the USA.
The Linnman study is performed by an expensive PET-scanning (positron emission tomography with (15)O labelled water), not a method that is used for more much more than scientific studies (due to high costs). However, it point to the issue of whiplash injury being invisible on the more commonly used CT and MRI scans. Question is a SPECT or a PET scan should be offered chronically ill whiplash patients help doctors document.
WHIPCON has chosen to present the study, as it is important documentation of mild traumatic brain injury as part of a whiplash injury. The Linnman study may help explain the post concussive symptoms in chronic whiplash patients observed by other scientists.