Sahasrara, “located” above the crown, is about the right to know. It is about consciousness: both intellect and spirituality, including self-knowledge. Most chakra-talking people lose me at this chakra (if they didn’t already), as “spirituality” is often interpreted as being in touch with deities or “higher powers.” Additionally, nearly everything I read about this chakra either contradicts something else I’ve read, or overlaps with the other chakras to such an extent that it’s hardly useful.
The piece, though, about thought and understanding – this makes sense to me. When I think of the moments in which people put their hands on their heads – myself included – they are moments of disbelief. I see this at baseball and football games. I see it during arguments between intimates, or from parents whose child is doing or saying something unfathomable. Placing the hands on the heads seems to me to be the last straw, the thing we do when we have no idea what else to do; we simply cannot fully understand what is happening. I think of the crown chakra as being about the pursuit of intellectual understanding, at any and all levels.
Sometimes this is deficient, reflecting a sort of cognitive sluggishness, a disinclination or doubt in one’s ability to know or understand. Rigid belief systems, being closed off to new information, intellectual apathy (or what I call a commitment to “it is what it is” type of philosophy), and difficulties learning would all, then, be related to an underdeveloped seventh chakra.
An excess of energy in the crown chakra may be related to: hypersensitivity to stimulation, cognitive processing problems, hyper-spirituality (leaping from one spiritual system or belief to another, seeing the mundane only in mystical terms), being easily confused, and disconnection with the physical world. (It seems to me that an overactive crown chakra looks a lot like an underactive root chakra, which also makes a good deal of sense.)
Physical and mental symptoms include many of the same as imbalance in Ajna: depression, headaches (particularly at the top of the head), learning disabilities and mental and neurological disorders, including Alzheimer’s and schizophrenia. Balance in the seventh chakra brings wisdom, connectedness, spiritual insight, mindfulness and inner calm.