Head knocks left, right and centre': Jockey's brain could unlock impact of a career on the track

Jockey Dale Spriggs rode close to 3,000 winners in a career spanning almost 40 years.

He estimates he suffered somewhere between 20 and 30 concussions, not just in races but during track-work and in the barriers.

"You are on a 500-kilo horse in a confined space," he told 7.30.

Please click here to read the rest of the article as it appears on the ABC News Website.

Article written by: Tracy Bowden