Michelle N. Shiota, Ekman's theory of basic emotions, in Harold L. Miller (a cura di), The Sage encyclopedia of theory in psychology, Thousand Oaks, CA, Sage Publications, 2016, pp. 248–50., DOI:10.4135/9781483346274.n85, ISBN 978-1452256719.
«Some aspects of Ekman's approach to basic emotions are commonly misunderstood. Three misinterpretations are especially common. The first and most widespread is that Ekman posits exactly six basic emotions. Although his original facial-expression research examined six emotions, Ekman has often written that evidence may eventually be found for several more and has suggested as many as 15 likely candidates.»
