The impact of affective information on working memory: A pair of meta-analytic reviews of behavioral and neuroimaging evidence
Everyday life is defined by goal states that are continuously reprioritized based on available, often affective information. To pursue these goals, individuals need to process and maintain goal-relevant information, while ignoring potentially salient information that distracts resources from these goals. Empirically, this ability has typically been operationalized as working memory (WM) capacity. Interestingly, however, until recently there have been few concerted research efforts to investigate the impact of information’s affective salience on WM capacity. In the present review we address this question by exploring the potential differential impact of affective compared to neutral information on WM, and the underlying neural substrates. One hundred and sixty-five individual studies were included in the meta-analysis (N = 7433). Results showed negligible to small (d ̂ = –.07 – .20) effects of affective information on behavioral measures of WM in healthy individuals (n = 4936) that varied as a function of valence and task-relevance. For all behavioral results heterogeneity analyses were significant, demonstrating the need to identify further task-specific factors and individual differences that moderate affective WM. At the neural level (33 studies; n = 683), processing affective versus neutral material during WM tasks was associated with more frequent recruitment of the vlPFC, the amygdala and the temporo-occipital cortex. In contrast to healthy individuals, across behavioral studies those suffering from mental health problems (n = 2041) showed an impairment of WM accuracy (d ̂ = –0.21) in the presence of affective material. These findings highlight the importance of integrating behavioral and neural levels of analysis. Finally, these findings suggest that affective WM capacity may be a transdiagnostic mechanism associated with poor mental health.