Our ego-consciousness is centered not in our head but in our heart

More radiant than the Sun,
Purer than the snow,
Finer than the ether,
Is the Self,
The Spirit in my heart.
This Self am I.
I am this Self.

An excerpt from
Wonders of the World, Ordeals of the Soul, Revelations of the Spirit. Lecture 9 of 10.

Rudolf Steiner, Munich, August 26, 1911:

Now we are in a position to carry to completion what we have already said about the brain. If we go farther and consider the human being clairvoyantly in respect of other regions of his being, we find something most remarkable. Whereas the etheric and astral elements mount upward as far as his brain, where the astral part is arrested and the etheric part protrudes beyond as a kind of corona, we see that the ego-part of man has been arrested earlier as a kind of inner aura in the region of the heart. The true inner ego-aura is already arrested in the region of the heart, it only presses upward as far as the heart, and there unites with a part of the outer aura, unites with the corresponding part of the macrocosmic aura. Two elements in fact are entwined in the heart: the element which enters from the cosmos, and the ego-aura which mounts up from below, but is dammed back in the heart. Just as the astral aura is arrested in the brain, so is the ego-aura held back in the heart, where it makes contact with an element of ego-aura coming from without. Hence the fact is that the real ego-consciousness of man does not take place in the brain. What I have said about the man of Atlantis, that his ego was drawn into him, must be thought of more explicitly as an incoming of the external cosmic ego, which since the time of Atlantis has advanced as far as the heart, where it has united with another stream which comes up from below and reaches the heart. Thus the heart is organically the place where through the instrument of the blood the real ego of man as it manifests in our consciousness comes into being.

Source: https://martyrion.blogspot.com/2020/05/alpha-and-omega-atman-brahman.html