When meditating or practicing yoga people can control their mental states, and manipulate their brain waves producing a memory-triggering creative theta state. Mental phenomena such as hypnagogic imagery, creative thoughts, integrative experiences, and spontaneous memories may be brought with theta state. In theta state, the physical body is deeply relaxed but mind is extremely alert and lucid. Inspiration or insight appears while in theta state of mind. Alpha frequencies are higher than theta, and less than beta.
Alpha produces relaxation.
The meditative state can also be named alpha and theta state. At first mind goes empty, and then the feeling is replaced by creative imagination or day dreaming. Inner healing of the physical body is accelerated in alpha and theta state. And healing by bio-energy can be done while the healer and healee appear to be in this state. This is extremely beneficial to reach a higher level of mental powers and reorientation toward life.