Final answer:
The patient showing altered speech, behavior, and a lack of emotion is likely suffering from disorganized schizophrenia. This subtype of schizophrenia includes disorganized thinking and a flat emotional affect, treated with antipsychotic medications.
Step-by-step explanation:
A patient who suffers from altered speech and behavior, and often does not show emotion, may be exhibiting signs of disorganized schizophrenia. Disorganized schizophrenia, which is one of several types of schizophrenia, is characterized by disorganized thinking, speech, and behavior, as well as a lack of emotional expression. The symptoms of schizophrenia broadly include issues differentiating reality from imagination, inappropriate emotional responses, and difficulty with social interactions. Such symptoms are thought to be linked to malfunctioning dopaminergic neurons and issues with glutamate signaling, and are typically managed with antipsychotic medications that block dopamine receptors.