As explained in the main article (Mapping the Brain: The Missing Dimension), the human spirit (or spirit in man) imparts human intellect to our physical brains. It is by far the main factor in making people vastly more intelligent than animals. Yet this spiritual aspect of human existence is nothing like the immortal soul concept widely introduced into Western philosophy by the adoption of teachings of ancient Greek mythmakers.
The spirit in man is not animate of itself. It is not a spirit entity that consciously lives on when we die. As a number of scriptural passages show, this human spirit has no consciousness after death (see Psalms 6:5 Psalms 6:5For in death there is no remembrance of you: in the grave who shall give you thanks?
American King James Version×; Ecclesiastes 9:5 Ecclesiastes 9:5For the living know that they shall die: but the dead know not any thing, neither have they any more a reward; for the memory of them is forgotten.
American King James Version×, Ecclesiastes 9:10 Ecclesiastes 9:10Whatever your hand finds to do, do it with your might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, where you go.
American King James Version×). We have no awareness of anything at all after we die. Then at a future time in the resurrection, God will place our individual spirits within new bodies, restoring us back to conscious life.
The first resurrection to eternal spirit life, comprehensively described in 1 Corinthians 15, is that of truly converted Christians at the second coming of Jesus Christ (1 Thessalonians 4:13-17 1 Thessalonians 4:13-17  But I would not have you to be ignorant, brothers, concerning them which are asleep, that you sorrow not, even as others which have no hope.
 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him.
 For this we say to you by the word of the Lord, that we which are alive and remain to the coming of the Lord shall not prevent them which are asleep.
 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
American King James Version×; Philippians 3:20-21 Philippians 3:20-21  For our conversation is in heaven; from where also we look for the Savior, the Lord Jesus Christ:  Who shall change our vile body, that it may be fashioned like to his glorious body, according to the working whereby he is able even to subdue all things to himself.
American King James Version×). Then a thousand years later, a second resurrection happens to those who never really knew or heard of Jesus Christ or had no real opportunity for spiritual conversion during their lifetimes. It will be a wonderful opportunity to obtain everlasting life in God’s Kingdom, joining those who are already in God’s spirit-composed family.
To understand these matters in much more biblical detail, read the Bible study aids What Happens After Death? and Heaven and Hell: What Does the Bible Really Teach? The error of the immortal soul concept—and the fact that the "soul" can and does die (Ezekiel 18:4 Ezekiel 18:4Behold, all souls are mine; as the soul of the father, so also the soul of the son is mine: the soul that sins, it shall die.
American King James Version×, Ezekiel 18:20 Ezekiel 18:20The soul that sins, it shall die. The son shall not bear the iniquity of the father, neither shall the father bear the iniquity of the son: the righteousness of the righteous shall be on him, and the wickedness of the wicked shall be on him.
American King James Version×)—is covered in both publications.
[Read the article: Mapping the Brain: The Missing Dimension]