pgd wrote:
Are you baffled when diagnosed with autism or Asperger's or ADHD and find that the CT scan is normal, the MRI scan is normal, the EEG scan is normal, and all blood work is normal?
Not at all - standard brain scans can not detect left-handedness, sexual orientation, IQ, dyspraxia or aphonia, and they are all easily measured characteristics. As far as I know, standard brain scans can not even be used to determine gender. Brain scans are simply not, at present, an effective or useful method of examining these phenomena.
As far as I know, there are specialised tests that researchers claim are able to detect features of all of these, with varying levels of accuracy, so it is possible (actually very likely) that the technology will be available very soon. Whether it is ever preferable to functional diagnosis (by interview and observation) is the big question.
I would love a machine-based diagnosis of autistic spectrum disorder.