Although inspired by the doctrines of the Pythagorics and orphism, Plato could be taken by the founder of rational psychology. It should be noted, however, that his thinking changes considerably over time and often resorts to myths and explanations that are simply probable. Plato thought, therefore, that discovering what the soul is like was a divine task and too extensive. Man, the only thing he could aspire to is to talk about similarities.
The psychology developed by Plato has an intentionality:
Ethics: To prove the need to control the instinctive needs of the body and ensure a future retribution to the practitioner of justice, against the immoralism of some sophists.
Gnoseological: Establishing the possibility of knowing the Ideas.
The Rational Soul
Immortal, intelligent, of a “divine” nature and physically located in the brain.
The unspeakable soul
Mortal, source of noble passions and physically located in the thorax.
The Appetitive Soul
Mortal, source of unspeakable passions located in the abdomen.
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The theory of the soul could also be interpreted as dualistic in the sense that one part of it is immortal and another, linked to the body, is mortal.