A consistent but non-coincident visual pattern facilitates the learning of spatial relations among locations
Psychonomic Bulletin & Review (2014) - Comment
pubmed: 23843178  doi: 10.3758/s13423-013-0477-1  issn: 1531-5320  issn: 1069-9384 

Scott S. Katz, Michael F. Brown, Bradley R. Sturz