All were over forty years of age, intelligent, well-adjusted, and creative. They were also a highly motivated group, for they had either sought out mystical experiences in previous meditative or spiritual disciplines or had long maintained a major interest in integral levels of consciousness in general. During their first, sensory level on LSD, these few mature subjects showed an especially rich array of psychedelic phenomena. However, they then barely skimmed over the second and third level of experiences. As a result, they arrived rather quickly at the threshold of the fourth, integral level of experience.
Some small segments appear authentic.
In contrast, the subject driven by psychedelics is self-propelled into a sustained roller coaster ride, exposed to a heavy barrage of pressing perceptual, affective, and other mental phenomena. The drug experience lasts much longer. Some psychedelic subjects remain in their affect-charged experience at the integral level for from fifteen minutes up to two hours or more. After this encounter, they don't wish to return to another psychedelic experience in the near future. The drug experience transforms less frequently, and to a lesser degree.