title: Valence activates motor fluency simulation and biases perceptual judgment.
abstract: The concept of motor fluency, defined as the positive marking associated with the easy realisation of a movement, is used to explain the various compatibility effects observed between emotional valence and lateral space. In this work, we propose that these effects arise from the motor fluency simulation induced by emotionally positive stimuli. In a perceptual line bisection task (Landmark task) we primed each trial with an emotionally positive word, negative word, neutral word or no word before asking participants to verbally indicate the side of the vertical mark on the horizontal line (Experiment 1) or to indicate the longest side of the line (Experiment 2). After positive words and for bisected lines, participants' responses were biased towards their dominant side for both right- and left-handers and similarly under the two different instructions. As movements of the dominant hand or in the dominant hemispace have been described as the most fluent lateral actions, this result supports our hypothesis that positive stimuli induce a mental simulation of fluent lateral movements. Furthermore, the replication of the effect under opposite instructions between the two experiments is in line with an explanation in terms of a bias in response selection rather than variations in perceptual content.
authors.affiliation: Laboratoire Dynamique des Capacités Humaines et des Conduites de Santé (Epsylon), EA 4556, Université Montpellier 3, Site St Charles, Route de Mende, 34199, Montpellier Cedex 5, France. audrey.milhau@gmail.com.
authors.forename: Audrey
authors.initials: A
authors.lastname: Milhau
authors.affiliation: Centre de Recherches sur le Sport et le Mouvement (CeRSM), EA 2931, Université Paris Ouest-Nanterre-La Défense, Nanterre, France.
authors.forename: Thibaut
authors.initials: T
authors.lastname: Brouillet
authors.affiliation: Centre de Recherches sur le Sport et le Mouvement (CeRSM), EA 2931, Université Paris Ouest-Nanterre-La Défense, Nanterre, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Dru
authors.affiliation: Cognitive and Affective Sciences Laboratory (SCALab), UMR CNRS 9193, Université de Lille, Villeneuve d'Ascq, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Coello
authors.affiliation: Laboratoire Dynamique des Capacités Humaines et des Conduites de Santé (Epsylon), EA 4556, Université Montpellier 3, Site St Charles, Route de Mende, 34199, Montpellier Cedex 5, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Brouillet
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015982:Bias; D003210:Concept Formation / Q000502:physiology*; D004644:Emotions / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007600:Judgment / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*