This image is a montage containing reduced size copies of the 15 images (indexed 0-14) used in the matrix pattern recognition test. The thumbnails are 20% of the original bitmap pixel resolution.

This resource can be downloaded or viewed using the link: matimg_real.png

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ctsu.ox.ac.uk/ukb/ukb/images/matimg_real.png