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 To give a sense of the size of the field, the number of citations produced by the search terms “Adolescen*+Brain” in the Web of Science database was 6 in 1990, more than 200 in 2000, approximately 900 in 2010, and more than 1100 in 2012.
 It should be noted that outside the field of neuroscientific imagery, the validity of Ekman and Friesen’s POFA set as well as the theory of the universality of the basic emotions remain controversial, see Russell 1994, Russell and Fernández-Dols 1997, Leys 2010 and Rosenwein 2010.
 I develop this argument at length in my doctoral thesis (Gumy 2015).
 See, for example, Löwy 1995 and Gardey 2005.
 Historiography generally places the juncture of photography and the study of the emotions in the late nineteenth century with the work of Guillaume-Benjamin Duchenne-de-Boulogne in France and Charles Darwin in England. Ekman presents the Pictures of Facial Affect published in 1976 as the culmination of years of research in the footsteps of those philosophers, research whose purpose stated a posteriori was to end the controversy surrounding Darwin and the theory of the universality of the emotions (Ekman, Friesen and Tomkins 1971, Ekman 1998). On this point, see Prodger 1998a and 1998b.
 While Ekman and Friesen’s POFA set is the most well known, other more recent sets have come to light, for example Tottenham et al. 2009.
 For a critical development of this point, see Leys 2010, p. 84-89.