Inclusion Criteria:  Have a diagnosis of primary progressive semantic aphasia according to the criteria of Gorno-Tempini et al (2011) (Appendix A) Being in the mild to moderate stage of dementia (MMSE score between 10 and 28) (Crum et al., 1993; Derouesné et al., 1999) Common French Being affiliated to a social security scheme Being over the age of 18 years old  Exclusion Criteria:  Have significant uncorrected visual and/or hearing impairment Have a history of brain injuries, major head trauma Have untreated psychiatric disorders Have significant motor and/or comprehension problems that make it impossible to take part in the study Chronical use of drugs and/or alcohol Under guardians or curators Severe depression (Beck's depression scale score > 9) (Beck & al., 1961)