Evidence across multiple psychological and neurophysiological studies indicates that negative affect and emotional valence impair cognitive processing efficiency by imposing extraneous cognitive load and diverting neural resources away from primary tasks.
The retrieved papers consistently demonstrate that negative affect, emotional valence, or stress negatively impact cognitive load and efficiency by diverting attentional resources and increasing extraneous load. Papers [0], [1], [8], and [10] provide direct empirical support for this relationship using behavioral, neurophysiological, and self-report measures. None of the papers refute the claim.