title: Perception of emotions in mild cognitive impairment and Alzheimer's dementia: does intensity matter?
abstract: BACKGROUND
  To provide a review of the literature on the perception of emotion in Alzheimer's dementia (AD) and Mild cognitive impairment (MCI), and to evaluate if emotion intensity matters.
  
  
  METHODS
  A systematic literature search of PubMed database was carried out using combinations or truncated versions of the keywords "MCI", "Alzheimer", "emotion recognition", "facial emotion recognition", "social cognition" or "emotion perception". Twenty-eight articles were found to meet the inclusion criteria.
  
  
  RESULTS
  Overall, AD patients performed worse on emotion perception than MCI patients and healthy controls. Half of the studies found an emotion-specific deficit for MCI patients on the emotions anger, sadness and fear. However, studies taking emotion intensity into account are still scarce.
  
  
  CONCLUSIONS
  An emotion-intensity based approach may be more sensitive to detect subtle impairments in facial emotion recognition. Future studies need to take emotion intensity into account and also consider confounding factors such as overall cognition and mood.
authors.affiliation: Department of Medical Psychology, ZGT Hospital, Almelo, the Netherlands.
authors.forename: Maaike Waanders-Oude
authors.initials: MW
authors.lastname: Elferink
authors.affiliation: Department of Medical Psychology, ZGT Hospital, Almelo, the Netherlands.
authors.forename: Ilse
authors.initials: I
authors.lastname: van Tilborg
authors.affiliation: Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, the Netherlands; Department of Medical Psychology & Radboud Alzheimer Centre, Radboud University Medical Center, Nijmegen, the Netherlands.
authors.forename: Roy P C
authors.initials: RP
authors.lastname: Kessels
keywords: Dementia; Emotion perception; Face perception; Mild cognitive impairment; Social cognition