Final answer:
Lydia's schizophrenia symptoms, including a monotone voice and immobile face, are described as having a flat affect. The term 'flat' is the correct answer, referencing a diminished emotional expression associated with schizophrenia.
Step-by-step explanation:
In addition to her delusions and disorganized thinking, Lydia's schizophrenia was marked by a flat affect; that is, a monotone voice, immobile face, and no signs of expression. The correct answer is d. flat. This term is used to describe schizophrenia symptoms related to a diminished emotional expression. People with a flat affect may not show the signs of emotion that one would expect in response to certain situations. For instance, their face may be immobile, and their voice might lack variation in tone. Neuroleptic drugs, used in treating schizophrenia, can reduce such symptoms although they may also produce side effects that can affect a patient's overall responsiveness and expression.