'Psychologists, and especially psychiatric practitioners, of course experienced a far more ambiguous relation to introspection and indeed intuition as investigative modes. But even here discussion decreasingly focused on the personal experience of those who instigated lines of inquiry, and increasingly appealed to self-reports of experiment participants selected for their observational acuity alongside technical recording or measurement of bodily response (e.g. Engstrom 2003, Ch. 5; Green 2010). Investigators working in the growing number of laboratories devoted explicitly to experimental psychology appealed to tools such as the Hipp chronoscope and various forms of tachistoscope to legitimate their claims to be conducting scientifically rigorous investigations (Carroy and Schmidgen 2002, 6-11, 19-20, 26; Benschop 1998).'