In another study, Baron-Cohen and others at the Autism Research Centre tested Tammet's abilities in around 2005. Tammet was found to have synaesthesia, according to the "Test of Genuineness-Revised", which tests the subjects' consistency in reporting descriptions of their synaesthesia. He performed well on tests of short-term memory (with a digit-span of 11.5, where 6.5 is typical). Conversely, test results showed his memory for faces scored at the level expected of a 6- to 8-year-old child in this task. The authors of the study speculated that his savant memory could be a result of synaesthesia combined with Asperger syndrome, or it could be the result of mnemonic strategies.