Jung first met Freud in Vienna in 1907. Main Ideas Collective Unconscious Unconsciously, human beings possess the collective experiences of all human beings before them. Active in our dreams and fantasies, the collective unconscious is woven into our biology. Archetypes Symbolic representations of key human experiences. Introverts are described as being shy, hesitant, and prefer to watch the world than actively participate.
Extroverts are confident, outgoing and seek as much stimulation in as many ways as possible.
Modern psychology still uses these terms today.