Glossary entry (derived from question below)
English term or phrase:
have lost favor in the last quarter of the 20th century
French translation:
sont tombées en désuétude dans le dernier quart du XXème siècle
English term
Greece
LEGAL, EU, CORPORATE TRANSLATIONS
Native in: Greek 
Works in: French to Greek, Greek to French, English to Greek, and 3 more.
have lost favor in the last quarter of the 20th century
The psychoanalytic focus on the symbolic meaning of obsessions and compulsions has given way to an emphasis on the form of the symptoms: recurrent, distressing and senseless forced thoughts and actions. The content of symptoms may reveal more about what is most important to or feared by an individual (e.g., moral rectitude, children in harm?s way) than why that particular individual developed OCD. Alternatively, the content (e.g., grooming and hoarding) may be related to the activation of fixed action patterns (i.e., innate complex behavioral subroutines) mediated by the brain areas involved in OCD.
Non-PRO (1): Francis Marche
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Proposed translations
France
Specialty: Biology, Chemistry, Medicine
Native in: English 
, French
Works in: English to French, French to English
sont tombées en désuétude dans le dernier quart du XXème siècle
sont en perte de vitesse
ont perdu des adeptes
......
au cours du dernier quart du 20ème siècle
Ceci dit, on dirait que ce texte date de la fin du 20ème siècle. Si on le disait aujourd'hui, on dirait plutôt "étaient en perte de vitesse". Je n'ai pas le texte devant les yeux mais il faudra faire attention à cet élément-là
se sont essoufflées
ont perdu de leur superbe au cours des 25 dernières années du 20ème siècle
n'ont plus la cote
ont perdu de leur popularité à partir du milieu des années soixante-dix
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