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pregnenolone
Pregnenolone is a steroid hormone, present in insects and crustaceans, as well as all vertebrate animals. It exists in the brain of humans where it regulates synaptic plasticity. Synaptic plasticity is important for learning and memory formation.
The process of synaptic plasticity involves the formation, strengthening and weakening of connections between neurons. The human brain has about 100 billion neurons that communicate with each other via synapses.
The main purpose of learning and memory is to build a model of the world inside your head. Neural plasticity allows you to update this model with new information.
The human brain has no ability to directly process sensory data. The visual cortex of the brain will never see or hear anything in your entire life. Your senses have to be converted into a form that the brain can use.
The human brain can be compared to a computer. The real world is like the internet.
A person's behavior is conditioned by the rewards he receives and the punishments that are imposed on him. Punishments can be physical or psychological.