@emiliya As I understand it sociopaths are that way all the time. Part of their brain is missing. It's a genetic defect involving runaway serotonin production in the womb that damages brain tissue. You end up with arias of the brain that are just gone. You can't feel guilt, shame, empathy or even taste and smell correctly. Emotions are blunted over all so that it takes intense experiences to even feel alive. In some ways sociopaths resemble AI more than a human being.

@HobNoblin Sociopath is psychopath. Forensic psychologists and psychiatrists use the word psychopath. Sociopath is the word that laymen use. Media and everyday people use it to describe those they find unpalatable. It is easier for them to use sociopath instead of psychopath. The former is vague, and they can get away with using it.

“You can't feel guilt, shame, empathy or even taste and smell correctly.”

Smell? Taste? Psychopaths can smell and taste. The problem is not the absence of emotions you list. It is about priorities and what matters to the psychopath. Other people are able to care about boundaries and hurting others. The psychopath is less able to care. They have needs that need to be fulfilled. There is no missing part of the brain of a psychopath. It is a functioning brain with all the parts, but there is reduced activity and differences in the structure to do with emotion regulation and impulse. The amygdala and prefrontal cortex are compromised.

@emiliya Yes the prefrontal cortex and amygdala are smaller and sluggish, they don't react like they would in a normal person. The article I'm looking at says their corpus colosseum is abnormal too. The two sides of their brain can't communicate like they should. Your profile says you're from Russia, is that true?