Final answer:
The term for perception without external stimulus confused with reality is 'Hallucination'. Hallucinations are different from both illusions and delusions; they originate in the brain without any actual sensory input.
Step-by-step explanation:
The correct term for a perception in the absence of external sensory stimulation that is confused with reality is A) Hallucination. A hallucination is a false sensory experience that can involve any of the senses and is perceived as real when, in fact, no actual external stimulus is causing the perception.
The key to understanding hallucinations is knowing that they are distinct from reality and occur without any external trigger. Unlike illusions, which are misinterpretations of real sensory stimuli, hallucinations arise entirely from within the brain. For instance, people may hear voices when no one is speaking or see objects that aren't present. This phenomenon can occur in various circumstances, such as during a trance state, certain mental health disorders, or due to substance use. It is important to distinguish hallucinations from delusions, which are strongly held false beliefs, and from apparitions, which are ghostly figures that supposedly appear to people.