title: Neuroanatomical Correlates of Recognizing Face Expressions in Mild Stages of Alzheimer's Disease.
abstract: Early Alzheimer's disease can involve social disinvestment, possibly as a consequence of impairment of nonverbal communication skills. This study explores whether patients with Alzheimer's disease at the mild cognitive impairment or mild dementia stage have impaired recognition of emotions in facial expressions, and describes neuroanatomical correlates of emotion processing impairment. As part of the ongoing PACO study (personality, Alzheimer's disease and behaviour), 39 patients with Alzheimer's disease at the mild cognitive impairment or mild dementia stage and 39 matched controls completed tests involving discrimination of four basic emotions-happiness, fear, anger, and disgust-on photographs of faces. In patients, automatic volumetry of 83 brain regions was performed on structural magnetic resonance images using MAPER (multi-atlas propagation with enhanced registration). From the literature, we identified for each of the four basic emotions one brain region thought to be primarily associated with the function of recognizing that emotion. We hypothesized that the volume of each of these regions would be correlated with subjects' performance in recognizing the associated emotion. Patients showed deficits of basic emotion recognition, and these impairments were correlated with the volumes of the expected regions of interest. Unexpectedly, most of these correlations were negative: better emotional facial recognition was associated with lower brain volume. In particular, recognition of fear was negatively correlated with the volume of amygdala, disgust with pallidum, and happiness with fusiform gyrus. Recognition impairment in mild stages of Alzheimer's disease for a given emotion was thus associated with less visible atrophy of functionally responsible brain structures within the patient group. Possible explanations for this counterintuitive result include neuroinflammation, regional β-amyloid deposition, or transient overcompensation during early stages of Alzheimer's disease.
authors.affiliation: The Neurodis Foundation, CERMEP Imagerie du Vivant, Lyon, France.|Brain Dynamics and Cognition, Lyon Neuroscience Research Center, INSERM U1028, CNRS UMR 5292, Lyon, France.|Ecole Normale Supérieure de Lyon, Lyon, France.
authors.forename: Laurie-Anne
authors.initials: LA
authors.lastname: Sapey-Triomphe
authors.affiliation: The Neurodis Foundation, CERMEP Imagerie du Vivant, Lyon, France.|MedTech West at Sahlgrenska University Hospital, University of Gothenburg, Gothenburg, Sweden.|Division of Brain Sciences, Imperial College London, London, United Kingdom.
authors.forename: Rolf A
authors.initials: RA
authors.lastname: Heckemann
authors.affiliation: Clinical and Research Memory Center of Lyon, Hôpital des Charpennes, Hospices Civils de Lyon, Lyon, France.|Department of Medical Information and Research Evaluation, Hospices Civils de Lyon, Lyon, France.|University Lyon 1, F-69000, Lyon, France.
authors.forename: Nawele
authors.initials: N
authors.lastname: Boublay
authors.affiliation: Clinical and Research Memory Center of Lyon, Hôpital des Charpennes, Hospices Civils de Lyon, Lyon, France.|Centre Hospitalier Le Vinatier, Pôle Est, Bron, France.
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Dorey
authors.affiliation: Brain Dynamics and Cognition, Lyon Neuroscience Research Center, INSERM U1028, CNRS UMR 5292, Lyon, France.
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Hénaff
authors.affiliation: Clinical and Research Memory Center of Lyon, Hôpital des Charpennes, Hospices Civils de Lyon, Lyon, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Rouch
authors.affiliation: Brain Dynamics and Cognition, Lyon Neuroscience Research Center, INSERM U1028, CNRS UMR 5292, Lyon, France.|Centre Hospitalier Le Vinatier, Pôle Est, Bron, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Padovan
authors.affiliation: The Neurodis Foundation, CERMEP Imagerie du Vivant, Lyon, France.|Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom.
authors.forename: Alexander
authors.initials: A
authors.lastname: Hammers
authors.affiliation: Brain Dynamics and Cognition, Lyon Neuroscience Research Center, INSERM U1028, CNRS UMR 5292, Lyon, France.|Clinical and Research Memory Center of Lyon, Hôpital des Charpennes, Hospices Civils de Lyon, Lyon, France.|University Lyon 1, F-69000, Lyon, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Krolak-Salmon
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000473:pathology* / Q000503:physiopathology*; D001921:Brain / Q000473:pathology* / Q000503:physiopathology*; D016022:Case-Control Studies; D000066499:Facial Recognition; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009445:Neuroanatomy; D009483:Neuropsychological Tests; D010364:Pattern Recognition, Visual