Component controllability is the rare experience of gaining partial or complete conscious control over the details, content, and intensity of other currently occurring subjective effects. This occurs in a manner which is extremely similar to the level of control experienced by well-practised lucid dreamers during an ordinary dream. For example, this state could give a person the ability to manually manipulate and direct their current visual effects by allowing them to will specific components into occurring, stopping, increasing, decreasing or changing their behaviour. It could also allow the person to manipulate their cognitive or physical state by letting them select and control the presence and intensity of potentially any combination of specific components present within the subjective effect index. However, it is worth noting that it's questionable whether or not this experience is reflective of genuine control over the effects observed as it may simply be a delusion that gives one the feeling and perception of control. Component controllability is a very rare experience that most commonly induced under the influence of heavy dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.