It seems that many people say that hypnosis and meditation are very similar. But what are their key differences (both in a soft and hard way)?
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I believe this question is impossible to "answer" because the inherent premises in the question are based on the assumption that there are two discrete dichotomous phenomena, "hypnotism," and "meditation," which can somehow be meaningfully "defined," and, then, "compared."
Both "hypnosis" and "meditation" are figuratively vast conceptual collages of imprecise multiple-meanings, observations of what appear to be "special" states of human awareness, and consciousness, admixtures from what in "western science" is termed "psychology" with an equally vast mix of practices, lumped-together as "spiritual," from the world's religions, etc.
From the viewpoint of epiphenomenal philosophy ... wikipedia entry ..., and from some modern, western, theorists of human consciousness as grounded in our biological, neurological, reality, both hypnosis and meditation can be regarded as secondary phenomena: in the sense that they are culturally defined and shaped modes of thought, behavior, and experience, in a "continuum of consciousness," which, over time, are conserved, institutionalized, even valorised into being perceived as "sacred."
In Vipassana meditation, in the Theravadan Buddhist tradition (Sanskrit "sthaviravada," "teachings of the elders") one way the "anti-goal" of meditation could be defined is: it is a practice meant as a vehicle for the de-hypnosis of the "illusory personal, small, self," leading to a direct experience of the "real, undifferentiated, trans-personal Self."
But, in that tradition, in its "purest" form, meditation is not a "goal in itself," and meditation is not a "means to an end" of achieving "altered states of consciousness."
But, there are countless other types, schools, philosophies, of "meditation," with very different conceptual underpinnings, some "secular," some "formally religious," and a wide range of behavioral practices associated with them.
On the "grossest" level, you might say we observe, when we see what appears to be hypnosis of one person by another, a loss of conscious, and subconscious, control of self from the person hypnotized to the hypnotist. But, then: there's stage hypnosis, self-hypnosis, so-called therapeutic hypnosis for behavior modification (such as giving up smoking, etc.).
While we typically associate meditation with acts of what we define, in western psychological terms, as individual "self-control," and "discipline," there are traditions in which group practices (rituals) leading to mass ecstasy are considered meditation (Sufi Zhikr ?).
From one perspective, "cultural identity," itself, can be considered a cohesive set of internalized hypnotic states of mind: continually reinforced from within, and without, the self, and modified in biological development throughout the life-cycle ... I am not referring, here, to the movie-series, "The Matrix" :) !
Main difference is that the meditation is self-induced and with full self-awareness, whereas hypnosis is usually induced by another person (unless is self-hypnosis which is self-induced) and the person is in state of trance, amnesia or unconscious.
Hypnosis is defined by the U.S government as "the bypass of the critical factor of the conscious mind and the establishment of acceptable selective thinking.". Hypnosis can help you in various ways and is a calm state of altered-consciousness that allows a person to recall memories or be guided to change a behavior (in example to help someone stop smoking).
While meditation is a practice in which an individual trains the mind or induces a mode of consciousness. An ordinary person may be consider meditation as a prayer or total stillness, but the goal of meditation is to focus and quiet your mind, eventually reaching a higher level of awareness and inner calm.
According to some beliefs or movements, the meditation from ancient times is the method of communication with other realms/planes of existence (Sephiroth) and entities (higher self, astral beings, dead relatives, demons, aliens, ascended masters, angels, God, etc.), astral travel, remote viewing, clairvoyance or altering your body (Reiki, activating chakras, 3rd eye or DNA activation) or time-space reality (psychokinesis, telekinesis, teleportation, opening portals) and many more.
Whereas hypnosis was introduced to European society in 18th century and it is sometimes described as black magic and dangerous for our body and spirit, because the person is just the victim on stage with implanted suggestion by hypnotist. If it's done incorrectly, the victim suffers nightmares and aberrant behaviour.