“Seth material” search engine (Jane Roberts)

All in all, the intellect plays some part, but the intuitional qualities are most important. There are chemical changes, also, that occur with the physical body when projections happen, and electromagnetic variations. These vary according to the form in which the projection occurs.

The projected form does make some impression upon the physical system. It is possible for it to be detected. It is a kind of pseudo-image, materialistically speaking, but it has definite electromagnetic reality and chemical properties. Animals have sensed such apparitions. They react to the chemical properties and build up to the [perception of] the image from these.

Now, there are also electromagnetic changes [during projections] that can be perceived with instruments. Certain electrical fields will make themselves known under these conditions. The fields have always existed, but they will become apparent to physical instruments only when they are being crossed — in other words, at the very act of projection.