Dr. Gale Whiteneck, researcher at Craig Hospital, discusses his initial findings from a telephone survey of the general population seeking to find the prevalence of undiagnosed brain injuries.

That would be people who had a brain injury but never went to the hospital or doctor and might not exactly understand that they had a brain injury.

Dr. Whiteneck reviews the types of questions and procedures to comply with scientific expectations and validity.

So if they call you, what will you say?