Are We Sailing in the Right Direction for Deeper Insights Into Acceptance? Evidence From a Systematic Review of Research in Laboratory Settings.

This systematic review aims to review and update the current state of research on the acceptance strategy for a healthy population in a laboratory setting. Using a previously defined search strategy, the PsycInfo, PubMed, and Web of Science databases were searched from 1961 to May 2020 for articles on this topic. Twenty-five high-quality articles, involving a total of 2265 participants, met inclusion criteria. According to these results, acceptance is a strategy with promising outcomes for handling pain in healthy populations, although its superiority over other strategies to reduce negative affect, anger, and other pain variables is unclear. The instructions and outcome variables vary widely between studies, and few studies compare acceptance with mindfulness. We discuss these findings and provide information to guide future researchers for designing fine-grained investigations that can address the gaps in this area.