Inclusion Criteria:  age ≥65 years; diagnosis of dementia moderate to severe Clinical Dementia Rating scale (CDR) ≥2; presence of agitation and/or aggressiveness; manual and visual abilities sufficient in order to interact with the doll.  Exclusion Criteria:  age <65 years; refuse to participate; mild forms of dementia (CDR<2); contraindication for DT as experience of mournful or traumatic events related to parental experience; life expectancy lower than 3 months; negative interaction with the doll.