2026-04-18T04:27:12Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1834202025-12-04T22:34:49Zcom_2072_1057col_2072_478917col_2072_478931

00925njm 22002777a 4500 dc Calvo, Manuel G. author Fernández-Martín, Andrés author Recio, Guillermo author Lundqvist, Daniel author 2022-02-22T13:46:32Z 2022-02-22T13:46:32Z 2018-10-26 2022-02-22T13:46:32Z Most experimental studies of facial expression processing have used static stimuli (photographs), yet facial expressions in daily life are generally dynamic. In its original photographic format, the Karolinska Directed Emotional Faces (KDEF) has been frequently utilized. In the current study, we validate a dynamic version of this database, the KDEF-dyn. To this end, we applied animation between neutral and emotional expressions (happy, sad, angry, fearful, disgusted, and surprised; 1,033-ms unfolding) to 40 KDEF models, with morphing software. Ninety-six human observers categorized the expressions of the resulting 240 video-clip stimuli, and automated face analysis assessed the evidence for 6 expressions and 20 facial action units (AUs) at 31 intensities. Low-level image properties (luminance, signal-to-noise ratio, etc.) and other purely perceptual factors (e.g., size, unfolding speed) were controlled. Human recognition performance (accuracy, efficiency, and confusions) patterns were consistent with prior research using static and other dynamic expressions. Automated assessment of expressions and AUs was sensitive to intensity manipulations. Significant correlations emerged between human observers' categorization and automated classification. The KDEF-dyn database aims to provide a balance between experimental control and ecological validity for research on emotional facial expression processing. The stimuli and the validation data are available to the scientific community. Expressió facial Reconeixement facial (Informàtica) Facial expression Human face recognition (Computer science) Human observers and automated assessment of dynamic emotional facial expressions: KDEF-dyn database validation