According to Sechenov's argument, both animals and humans have an innate reflex that is consistent with existing anatomical reflex routes and has full functional capabilities at birth.

For example, babies are born with the ability to suck milk and swallow, retract their fingers immediately when touching hot things, their pupils will shrink when they suddenly see bright light, they will secrete saliva at the entrance of food, etc.

These are innate instincts of humans and animals that do not require any training and can be maintained forever.

Pavlov called this type of innate reflex "unconditioned reflex".

In addition to "unconditioned reflexes", Pavlov discovered another type of reflex, namely acquired reflexes.

This acquired reflex develops only during ontogeny.

For example, as long as you put meat in front of a dog without letting it eat it, the dog will drool.

Pavlov believed that this was because when dogs ate meat many times in the past, they first saw the shape of the meat and smelled the smell of the meat. Then, when the meat entered the mouth, the taste organs tasted the meat and then

Causes unconditioned reflex salivation.

The stimulation of the visual, olfactory, and taste organs is transmitted to the center, forming three excitatory foci in different areas of the dog's cerebral cortex.

Over time, the connection between these three excitement points gradually strengthened and consolidated, so that once the shape and smell of meat appeared in front of the dog, it would trigger the reflex of salivation just as if the meat had been eaten in the mouth.

This type of reflex is acquired, and Pavlov called it "conditioned reflex".

This is the physiological process of so-called "psychological" secretion.

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