@article{Beeli.2007, author = {Beeli, Gian and Esslen, Michaela and J\"{a}ncke, Lutz}, year = {2007}, title = {Frequency Correlates in Grapheme-Color Synaesthesia}, pages = {788-792}, volume = {18}, number = {9}, issn = {0956-7976}, journal = {Psychological Science} }