So, what does it exactly mean? I have had friends, who are also Buddhist, say that they have also had these, and that it most likely is your past life. Although I have heard this many times before, I am not actually sure what this means. And, if it is my past life, I am not sure I like having a spear in my stomach.
I would dismiss any notion like past lives and such. It's really cerebral baggage that only distracts and creates diversions same as the experiences people talk and relate about.
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Makyo is a wisp of the mind and as meditation "deepens" by which thoughts quiet down, it's nature starts to be uncovered, through which mayko manifests naturally with diminishement of unhindered thoughts or "chatter" as it were. It's nature is that by which counting breaths to develop focus gives away to shikantaza by which mayko plays in typically after counting the breath is mastered.
Usually that's where problems come in if a person gives substance or meaning to the experiences and as a result, attaches emotion or meaning when in fact it remains insubstantial by which you count breaths repeatably upon interruption of thoughts and subsequent meditation for which counting is no longer required, and acknowledged and allowed to let go and dissipate. Same as repeating the count of breaths.
That's why typically it's recommended by people to seek assistance by a teacher during this time as it can be difficult to understand what's going on whenever mayko arises, unless your aware of it's harmless and unsubstantial nature, by which teachers blow it off and tell you not to get wound up or involved with the experiences themselves.
Its just along the lines of "blowing the dust away" and clarity illuminates through what was once obscure.
It's why we meditate. :0]