Recently there has been considerable theoretical and empirical work attempting to identify specific cognitive dimensions that shape the emotional response. However, this work has almost universally neglected an important theoretical distinction between two types of cognition relevant to emotion: knowledge and appraisal. Knowledge has to do with the facts of an adaptational encounter, whereas appraisal defines the personal significance of an encounter for well-being. In the shaping of an emotion, knowledge is a distal variable which requires an additional process of appraisal to produce an emotion; appraisal is a proximal variable which directly influences whether an emotion will be generated, and if so, its kind and intensity.

In this article we examine the distinctions between knowledge and appraisal that are relevant to the emotion process, and how the failure to consider them muddies theoretical and empirical work. We examine a number of putative appraisal dimensions prominent in current theoretical systems, examine why they often constitute knowledge rather than appraisal, and discuss some of the appraisal dimensions in the emotion process. In addition, the major techniques used to study the cognition-emotion relationship are examined and their potential for providing evidence of appraisal rather than knowledge is evaluated.