 By the 1910s,  behaviorism  (which focused simply on the relationship between outward stimuli and behavioral response) had declared war on introspective psychology, portraying it as bogged down in irresolvable disputes between differing introspective “experts”, and also rebuking the introspectivists’ passive taxonomizing of experience, recommending that psychology focus instead on socially useful paradigms for modifying behavior (e.g., Watson 1913). In the 1920s and 1930s, introspective studies were increasingly marginalized. Although strict behaviorism declined in the 1960s and 1970s, its main replacement, cognitivist  functionalism  (which treats functionally defined internal cognitive processes as central to psychological inquiry), generally continued to share behaviorism’s disdain of introspective methods.