Ryan Gosling has explained how the psychical nature of filming his upcoming film First Man made him think he had caused brain damage.

Explaining how using a multi access trainer for hours at a time while filming caused him to suffer a head injury, an issue that was only picked up by his wife Eva Mendes who noticed a change in his personality. While Gosling began to discuss unusual subjects of conversation, Mendes suggested he should visit the hospital for a check up. What followed was a CT scan which uncovered that the actor had in fact suffered a minor concussion.

Watch Gosling explain the story while appearing on the Jimmy Kimmel show:

The new film will see Gosling once again team up with Oscar-winning director Damien Chazelle following their success with six-time Academy Award hit La La Land. According to a press release, First Man tells the riveting story of NASA’s mission to land a man on the moon, focusing on Neil Armstrong and the years 1961-1969.