its not really a matter of who "discovered" the instinct theory but who PROPOSED the instinct theory is what i think your question is asking in which case i believe the answer--if my memory serves me right-- is William McDougall
Instinct theory is a theory that looks at motivation of people and animals. In instinct theory, behavior is motivated by instinct, which is ingrained in animals to help them survive.
Instinct theory is a belief in psychology that instinct provides humans with the motivation to do certain actions and behave in a specific manner. Instinct theory was good at explaining why, for example, babies root onto their mother's nipple for milk. However, it didn't have much credence when it came to explaining our other behaviors. Instinct theory has been supplemented by drive-reduction theory, and arousal theory, both of which also try to explain motivation.
The concept of instinct in motivation theory was replaced by the concept of drive theory. Drive theory suggests that internal physiological needs create a state of tension or arousal that motivates individuals to act in ways that reduce this tension and restore homeostasis.
Instinct Theory - 2004 was released on: USA: 18 June 2004 (Triggerstreet.com Online Film Festival)
The cast of Instinct Theory - 2004 includes: LeeAnne Hutchison as Woman Adam Rothenberg as Man
Drive theory of motivation pays the least attention to individual differences in behavior, as it focuses on basic biological needs and drives that motivate behavior in a universal manner. This theory suggests that individuals are primarily driven by physiological needs, such as hunger or thirst, and that these drives push them to take action to reduce these needs.
Albert Einstein discovered the theory of relativity
Albert Einstein discovered the theory of relativity
referred to as biological determinism. It suggests that an individual's actions and traits are largely influenced by their biology, such as genes or neurological makeup, rather than environmental or social factors. This perspective has been criticized for oversimplifying human behavior and neglecting the impact of culture and individual experiences.
keep oneself safe
The theory of ghosts was discovered on the 6/6/6 of your mother.
instinct approaches to motivation are most apparent in the theory of evolutionary psychology, which suggests that motivations are driven by survival and reproduction instincts that have evolved over time.