Interpersonal Relations, Heider argued that social perception follows many of the same rules of physical object perception, and that the organization found in object perception is also found in social perception. Because biases in object perception sometimes lead to errors (e.g., optical illusions), one might expect to find that biases in social perception likewise lead to errors (e.g., underestimating the role social factors and overestimating the effect of personality and attitudes on behavior). Heider also argued that perceptual organization follows the rule of psychological balance. Although tedious to spell out in completeness, the idea is that positive and negative sentiments need to be represented in ways that minimize ambivalence and maximize a simple, straightforward effective representation of the person. He writes "To conceive of a person as having positive and negative traits requires a more sophisticated view; it requires a differentiation of the representation of the person into subparts that are of unlike value (1958, p. 182)." But the most influential idea in The Psychology of Interpersonal Relations is the notion of how people see the causes of behavior, and the explanations they make for it—what Heider called "attributions". Attribution theory (as one part of the larger and more complex Heiderian account of social perception) describes how people come to explain (make attributions about) the behavior of others and themselves. Behavior is attributed to a disposition (e.g., personality traits, motives, attitudes), or behavior can be attributed to situations (e.g., external pressures, social norms, peer pressure, accidents of the environment, acts of God, random chance, etc.) Heider first made the argument that people tend to overweight internal, dispositional causes over external causes—this later became known as the fundamental attribution error (Ross, 1977) or correspondence bias (Fiske & Taylor, 1991; Jones, 1979, 1990). Although he published little else, he kept voluminous notebooks which contained his reflections on psychology. These were subsequently edited in six volumes by Marijana Benesh-Weiner, a former student of Heider, who worked with Heider in organizing the collection for publication.(Heider & Benesh-Weiner, 1987a, 1987b, 1988, 1989a, 1989b, 1990). The Cognition-Emotion Linkage Although Fritz Heider’s notebooks do not contain a specific theory on emotions, his notes do contain evidence of his beliefs on a cognition-emotion link and a fundamental logic that underlies all experiences of emotional states. Heider also points out that emotions may influence or alter cognitive states among some people. Heider also offered many definitions of emotional states