hallucination (psychology), Dreams, Britannica Online Encyclopedia, The first stages of sleep appear to be dream-free. During this phase, measurements taken by an ...
Britannica online encyclopedia article on hallucination (psychology), the experience of perceiving objects or events that do not have an external source, such as hearing one’s ...
Watch high-res video (MP4) This link lets you watch a higher-quality version of this ... to Charles Bonnett syndrome -- when visually impaired people experience lucid hallucinations.