Abstract

In his still-authoritative history of science essay, Kuhn showed that scientific discoveries commence with awareness of anomaly that researchers initially struggle to notice. Kuhn drew on a psychological study to illustrate the problem. Bruner and Postman asked people to name playing cards on brief exposure. Most cards were normal, but some were anomalous, such as a red six of spades and a black four of hearts. On brief exposure all participants fitted the anomalous cards unhesitatingly into their existing cognitive scheme, identifying them as, for example, a six of spades or a four of hearts. With longer exposures subjects began to hesitate: ‘That’s a six of...