Ok Paul, I can't blame you for that.

Here's part of a text related to the JAS development (found on the net), which answers my question:

"One visible “fix” has been added to the aircraft, though. It consists of a small strake behind each canard surface, but their usefulness is restricted to angles of attack above the EFCS Manoeuvre Load Limitation Boundaries."

EFCS stands for Electronic Flight Control System.

The whole article may be found here:
http://www.mach-flyg.com/80jas.htm
The first part is written in Swedish but you'll find the English text by scrolling down the page a little bit.

Cheers