Please cite this article in press as: Heredia, L., et al. Mindfulness-based stress reduction training program increases psycho- logical well-being, and emotional regulation, but not attentional performance. A pilot study. Mindfulness & Compassion (2017), http://dx.doi.org/10.1016/j.mincom.2017.07.001 ARTICLE IN PRESS +Model MINCOM-27; No. of Pages 8 Mindfulness & Compassion (2017) xxx, xxx---xxx www.elsevier.es/mindcomp SPECIAL ARTICLE Mindfulness-based stress reduction training program increases psychological well-being, and emotional regulation, but not attentional performance. A pilot study Luis Heredia a,b , Laia Gasol c , David Ventura a , Paloma Vicens a,b , Margarita Torrente a,b,* a Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Rovira i Virgili University, Reus, Spain b CRAMC (Research Center for Behavior Assessment), Department of Psychology, Rovira i Virgili University, Tarragona, Spain c Department of Psychology, School of Educational Sciences and Psychology, Rovira i Virgili University, Tarragona, Spain Received 29 June 2017; accepted 5 July 2017 JEL CLASSIFICATION I31 KEYWORDS Mindfulness training; Psychological well-being; Attention; Emotional regulation; Empathy Abstract Recently, several studies have suggested that mindfulness-based training programs are beneficial for well-being and emotional regulation. In this article an assessment is pre- sented on the effects of a Mindfulness-Based Stress Reduction Training Program on the extent of mindfulness, psychological well-being, empathy levels, emotional regulation and neuropsychol- ogical functions. Results showed that the trained group significantly increased their observation and non-judgment of inner experience variables. The trained group also improved in subjec- tive psychological wellness, and emotional regulation, but not in attentional performance. The relationships between the results obtained are discussed, and a new method is proposed for assessing the capacity for emotional regulation. Further studies are necessary using larger samples. © 2017 Mindfulness & Compassion. Published by Elsevier Espa˜ na, S.L.U. All rights reserved. CÓDIGOS JEL I31 PALABRAS CLAVE Atención plena; Bienestar psicológico; Atención; Un programa reducido de entrenamiento basado en mindfulness incrementa el bienestar psicológico y la regulación emocional, pero no el rendimiento en atención. Un estudio preliminar Resumen En la actualidad disponemos de muchos estudios que demuestran que los programas de entrenamiento basados en Mindfulness producen beneficios sobre el bienestar psicológico y la capacidad de regulación emocional. En este estudio se analizaron los efectos producidos por un entrenamiento breve sobre los niveles de Mindfulness, el bienestar psicológico percibido, los niveles de empatía, la capacidad de regulación emocional y el rendimiento neuropsicológico. * Corresponding author. E-mail address: margarita.torrente@urv.cat (M. Torrente). http://dx.doi.org/10.1016/j.mincom.2017.07.001 2445-4079/© 2017 Mindfulness & Compassion. Published by Elsevier Espa˜ na, S.L.U. All rights reserved.