Which symptom reflects decreased emotional expression in schizophrenia?

Affective flattening is considered the correct answer as it refers specifically to a reduction in the emotional expression of a person, particularly evident in individuals with schizophrenia. This symptom may manifest as a lack of facial expressions, diminished eye contact, reduced gestures, and a monotone voice. Individuals exhibiting affective flattening may appear emotionally unresponsive or disinterested, which can significantly impair communication and social interaction.

In contrast, while alogia refers to poverty of speech and may also impact communication, it does not directly indicate the presence or absence of emotional expression per se. Anhedonia relates to the reduced ability to experience pleasure or interest in activities, but again, it does not specifically highlight emotional expression. Asociality is characterized by a lack of interest in social interactions; while it can coexist with affective flattening, it does not describe emotional expression itself, making affective flattening the most accurate symptom reflecting decreased emotional expression in schizophrenia.