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Many elements of culture made their first appearance in the UpperPaleolithic. Previous hypotheses put forth to explain this unprecedented burstof creativity are found wanting. Examination of the psychological basis ofcreativity leads to the suggestion that it resulted from the onset ofcontextual focus: the capacity to focus or defocus attention in response to thesituation, thereby shifting between analytic and associative modes of thought.New ideas germinate in a defocused state in which one is receptive to thepossible relevance of many dimensions of a situation. They are refined in afocused state, conducive to filtering out irrelevant dimensions and condensingrelevant ones.

Contextual Focus: A Cognitive Explanation for the Cultural Revolution of the Middle/Upper Paleolithic