Riding motorcycles helps keep drivers young by invigorating their brains, the scientist behind popular "Brain Training" computer software said Wednesday, citing a new scientific study.

"The driver's brain gets activated by riding motorbikes" in part because it requires heightened alertness, Ryuta Kawashima said after his research team and Yamaha Motor conducted a string of experiments involving middle-aged men.

"In a convenient and easy environment, the human mind and body get used to setting the hurdle low," he warned. "Our final conclusion is that riding motorcycles can lead to smart ageing."

Kawashima is the designer of "Brain Training" software, which incorporates quizzes and other games and is available on the Nintendo DS game console under the name "Brain Age" in North America.

A self-professed motorcycle fan, 49-year-old Kawashima cited a new study conducted jointly by Yamaha and Tohoku University, for which he works.