The question often comes up just exactly how does a seer see into the spirit realm? There are at least two different types of seers with respect to perceiving activity in the spirit realm, and how they see things in the spirit differ.
Some seers see very clearly
For some seers, something is literally hitting their retina and their optic nerves are literally transferring this information to part of their brain, which literally interprets it visually. They see very clearly things in the spirit realm. There is some brain chemistry activity going on related to this very clear ability to see things.
Biochemical reactions may be at play.
When seers take certain antidepressants or anti-migraine drugs, the brain chemistry changes in such a way that sometimes the seer ability is shut completely off. And yet, when these same people abstain from these medications, about two weeks later, the seer ability appears to switch back on.
I suspect the brain chemistry related to pineal gland in these types of seers that differ from non-seers, allowing their brains to interpret quantum wave patterns triggered by activity in the spirit realm that are reaching their retinas.
It’s like having a special antennae up that somehow pics up quantum vibrations that are emitted by spiritual activity.
Some seers see less clearly?
For other types of seers, their brains are picking up some sort of impression from the spirit realm, which it interprets visually, but the activity is probably not hitting their retinas, or at least not as clearly as the above type.
The impressions in the brain may come in a waking state or in a sleeping state (in which case, the impressions are dreams). They are able to perceive things physically, without some sort of lightwaves hitting their retinas, or if something does hit their retinas, it’s very faint, but their brains are still able to tune in to it, sometimes with practice, to detect the impression isn’t natural.
The Pineal Gland and the Spirit Realm
The ability to perceive into the supernatural realm may be related to brain chemistry surrounding the pineal gland. See this page for more thoughts on that.
Children and Seeing
A startingly large number of children can see into the spirit realm. This ability tends to fade over time. I suspect the children have their spiritual eyes blunted by the culture that rejects things of the spirit as “an overactive imagination.” I think their ability to perceive is also blunted by unnatural food (GMOs, processed carbs, too much sugar, etc.) and unnatural activity (starring at television programming for many hours a week, every week of the year, every year of their lives).
Frankly, humans weren’t designed to function well on unnatural foods and by sitting in front of television for most of their waking lives. It’s no wonder children’s ability to perceive in the spirit realm is poisoned out of them.
Most seers cannot control this ability. For some, it comes and goes. For others, it’s always apparent. If a dog suddenly runs into your line of sight, you will see it. You cannot help it. Maybe you don’t notice the dog because your mind is on something else, but you’ll still see it. Perhaps later, if someone ask if you saw a dog running around, you may recall what you saw.
Similarly, some seers can tune out what they see, but many cannot. They cannot help it.
Hormones and Sight
Hormones have a role to play in seeing into the spirit realm. I know many young children who could see clearly in the spirit realm early in their life, only to have the ability fade until puberty hits.
And then BAM, the ability is back. Hormones have flooded the brain to release sex hormones that impact sexual development (also related to the pineal gland), perhaps purging the body of prohibitive pollutants, and thus activating glands in new and sensitive ways, triggering the ability to pick up on things in the spirit realm.
Holy Spirit and Sight
Other people don’t receive the ability until they are filled with the Holy Spirit or have some other supernatural encounter.
One subset of this group find that the ability comes and goes, depending on how God is moving. Sometimes when the Holy Spirit is moving (as in a worship service), the veil between the physical realm and the spiritual realm is thin, and these people can see spiritual activity quite clearly.
Another subset finds the ability comes when the Holy Spirit took up residence in them and the ability never really goes away. For whatever reason that only God can truly explain, their brains were altered (healed?) by their salvation experience, and their ability to see was given (or did it return?)