Cohen, Stotland and Wolfe (1955), in their work on individual differences in cognitive motivation, identified a ""need for cognition"" which they defined as "the individual's need to organize his experience meaningfully", the "need to structure relevant situations in meaningful, integrated ways", and "need to understand and make reasonable the experiential world" (p. 291). They argued that, if this "need" were frustrated, it would generate "feelings of tension and deprivation" that would instigate "active efforts to structure the situation and increase understanding" (p. 291), though the particular situations arousing and satisfying the need may vary (p. 291). Cohen argued that even in structured situations, people high in NFC see ambiguity and strive for higher standards of cognitive clarity.