Example of screen format used for the online snap reaction test. This illustrates the display when a participant has correctly indicated that two symbols match.

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