Final answer:
Hearing, seeing, or feeling things that are not there are known as hallucinations, which are commonly associated with schizophrenia, which is treated with antipsychotic medications.
Step-by-step explanation:
The experience of hearing, seeing, or feeling things that are not there is known as hallucinations. This phenomenon can occur as a symptom in various conditions but is notably associated with the mental disorder schizophrenia. Schizophrenia is characterized by symptoms such as hallucinations, delusions, emotional irregularities, difficulty in thinking, and social challenges. The treatment for schizophrenia generally includes antipsychotic medications that work by blocking dopamine receptors, which can lead to a reduction in symptoms, although these medications are not a cure and must be continued throughout the patient's life.