Psychological Type Theory
Jung's first observations revolved around two ways people engage with the world.
Extraversion does not mean exaggerated, Introversion does not mean shy. The terms describe where our mental energy flows, and are also referred to as an "attitude".
Jung continued, stating that our brain activity is mainly engaged in one of two things: taking in information (a process he called Perception), or making decisions based on the information we have taken in (which he called a Judging process). These two processes are also referred to as the cognitive or mental functions.
Jung describes two forms of taking in information: Sensation (aka Sensing) 'S' or Intuition 'N'.
Sensing does not mean sensitive, Intuiting does not mean intuitive. The terms describe how we use our brains to take in information.
Jung described two forms of decision-making: Thinking 'T' or Feeling 'F'.
Thinking does not mean rational, Feeling does not mean emotional. The terms describe how we use our brains to make decisions.
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