Effects of positive affect and positive emotions on executive functions: a systematic review and meta-analysis

Positive emotions (PEs) impact cognitive processes, including executive functions (EFs; i.e. inhibition, working memory, cognitive flexibility). However, previous reviews and meta-analyses report contradicting results. Thus, this review takes a novel approach to overcome conflicting findings by clearly conceptualising PE induction and by providing a detailed description of the tasks used to assess EFs, as well as by exclusively focusing on EFs. A systematic literature review and meta-analysis was performed. Study inclusion criteria required that subjects were healthy individuals over 18 years, PEs were induced in a controlled laboratory setting, a baseline measurement and a control condition was required, and finally, EFs were measured as a dependent variable using valid measurement instruments. The literature search was performed on PRIMUS, including relevant databases such as ERIC, MEDLINE, Psych ARTICLES, Psych INFO or SocINDEX. From a total of 6,661 identified articles, only 13, which featured 20 experimental studies, were included. Results show that the overall induction of PEs successfully caused an increase in valence and/or positive emotions. However, no significant effects of PE on EFs were detected (d = -0.051, p = .405). Reasons and future research will be discussed.