Effects of an app-based brief gratitude practice on positive and negative daily affect during the COVID-19 pandemic. Lin S, Shen S, Ivcevic Z, et al. Effects of an app-based brief gratitude practice on positive and negative daily affect during the COVID-19 pandemic. Acta psychologica. 2025;260:105579. doi:10.1016/j.actpsy.2025.105579 Read more