Emotional concordance refers to dynamic coordination of two or more components of the emotion system in response to environmental demands. Concordance can occur within a person (e.g., sympathetic arousal with a fearful expression) and between persons (e.g., similar emotional expressions in couples). This introduction to the 2021 special issue examines current models and methods of concordance. First, we highlight how emotion researchers have begun to focus on concordance across a range of populations and contexts. Second, we note concordance research benefits from examination of multiple emotion systems simultaneously (within- and/or between-persons), resulting in a multivariate time series. Finally, we describe recent efforts to understand the functional (e.g., health-related) consequences of concordance. The articles in this special issue collectively point toward exciting new directions in examining whether and when concordance occurs, and how it varies by individual differences, context, and measures.

情绪协调是指响应环境需求而动态调整情绪系统中两个或多个组成部分的过程。一致性可以发生在一个人内部（例如，对恐惧表达的同情唤醒）和人与人之间（例如，夫妻中类似的情感表达）。《 2021年特刊》的引言探讨了当前的协调模型和方法。首先，我们重点介绍情绪研究人员如何开始关注一系列人群和环境下的协调一致。其次，我们注意到一致性研究受益于同时检查多个情感系统（人与人之间和/或人与人之间），从而产生了一个多元时间序列。最后，我们描述了最近为了解协调的功能性后果（例如与健康相关的后果）而做出的努力。