Throughout a lengthy interview covering a wide range of topics, both neutral and emotionally significant, a patient's face, voice, and gestures remain flat and unchanging, showing no more feeling in response to distressing content than to mundane content. Before revealing the answer: is this dissociation of affect?

No, this is more consistent with affect blunting than dissociation of affect. Dissociation of affect differs from affect blunting, a morbid expression of emotion in which the capacity for emotional response is generally reduced across the board, rather than selectively separated from particular content, whereas here the flattened response is uniform across neutral and emotionally significant material alike, which is the defining pattern of affect blunting rather than a selective separation confined to specific charged content.