The correct answer is Sigmund Freud
According to Freud's psychoanalytic theory, all psychic energy is generated by libido. Freud suggested that our mental states are influenced by two competing forces: cathexis and anti-cathexis.
Cathexis has been described as an investment of mental energy in a person, an idea or an object. If you are hungry, for example, you can create a mental image of a delicious meal that you want. In other cases, the ego may use some energy from the id to seek activities that are related to the activity in order to disperse some of the excess energy from the id. If you can't really look for food to appease your hunger, you can instead flip through a cookbook or browse through a recipe blog.
Anti-cathexis involves the ego blocking the id's socially unacceptable needs. Suppressing urges and desires is a common form of anti-cathexis, but it involves a significant investment of energy.
