Fabe discusses the scene of Antoine’s interview with the psychiatrist as an example of the documentary techniques that are used in The 400 Blows. She points out that not only the visual effect of this scene shows the documentary quality, but the use of sound also adds further to the documentary effect.On one hand, for the visual effect, Fabe states that Truffaut’s use of jump cuts, or deliberately jerky edits, in this scene is often used in documentary films to indicate that parts of the interview have been elided and that the audience is seeing only the significant parts. In addition, to strengthen the natural aura of direct cinema, Truffaut directed the actor Jean-Pierre Leaud to improvise his answers to the psychiatrist’s questions rather than having him speak from a script, which leads to the perfect and natural performance of this important scene. We can see not only the autobiographical chronicle of Truffaut, but a hint of the story of Leaud through this non-planned out acting.On the other hand, she focuses on the questioning of the psychiatrist in this scene. Fabe points out that the psychiatrist never appears on the screen, in which only her questions are heard. The psychiatrist’s presence as an interrogating voice without a body not only perfectly captures the cool impersonality of the system in which Antoine has been abandoned, but is also a common technique seen in documentaries which further demonstrate the documentary effect of this film.