And where did you get the idea that the psychopath does not experience them? Maybe just his joy, love and shame are different from yours?
But if we assume that this is really so, then why are you trying to "reveal" the psychopath?
You probably don't mean "psychopath", but "sociopath". In this case, there is no need to specifically check, but when you notice that this person shows the ability to defiantly step over your corpse, then this is him. But, I think, there is nothing to be afraid of, such qualities are shown, for example, by almost all adolescents, due to self-affirmation or from unwillingness to experience deep emotional pain on their own skin (as a protective mechanism). The main thing is not loaded.
Another interesting point is that people with a tendency to sociopathy, well, or sociopaths, consciously or unconsciously, choose vulnerable and addicted people as a couple. This is how divine training works). So if it smells like sociopathy, it's time to think about your personal detachment, independence. About your personal ethical principles and fundamental moral, your personal norms, until they are hacked.
If you do not have these principles, then they will begin to appear later, after the sociopath creates a situation of "at least endure the saints." That way, you can say thank you to the sociopath! And who will be the winner here is still a big question. But this adventure is not easy. Does everyone need this experience?
I'm certainly not a psychologist, but I can give you some advice. A person always reacts to both external and internal factors. A person easily betrays his inner state through facial expressions. There is a wonderful book - Paul Ekman "The Theory of Lies". Paul Ekman reveals the meaning of human facial expressions. If you are lazy, then there is an option in the series - "Lie to me if you can".
You are describing a very specific, rather Hollywood understanding of psychopathy.
The term is actually ambiguous, rather outdated, now they say about personality disorder.
Well, the manifestations of hysterical, paranoid, schizoid, asthenic, etc. psychopathies will, of course, differ. I would find it difficult to diagnose the Hollywood type of "psychopath". Some combination of hysterical traits: charming, manipulative, extremely egocentric - and from paranoid desire for some kind of psychopathic villainous goal)) - But both types of psychopaths will be much more diverse and lively. Well, the root, diagnostic trait of a psychopath, at the level of the definition of a concept, is social maladjustment. And the Hollywood psychopath is quite socially embedded.
In addition, just a Hollywood creature can perfectly imitate feelings and interest in people.
I think the legend is still based on the hysteroid: charm, manipulativeness; the famous hysterical triad - deceit, demonstrativeness, theatricality; high egocentrism.
Well, take a closer look at the charms) True, usually you will still find all this at the level of personality drawing or accentuation - that is, within the boundaries of the norm. If you want to understand whether this is not a psychopathy -
there are criteria (called the "Gannushkin-Kerbikov Criteria for Psychopathies") that allow you to assess the severity of character and decide whether this is still the norm or is already a pathology:
A character can be considered pathological, that is, regarded as psychopathy, if it is relatively stable over time, that is, it changes little during life .
The second sign is the totality of character manifestations : with psychopathies, the same character traits are found everywhere: at home, at work, and on vacation, and among acquaintances and among strangers, in short, in all circumstances. If a person, for example, is alone at home, and “in public” is another, accentuations are not always and not everywhere, then this is not a pathology, not a psychopathy.
Finally, the third and, perhaps, the most important symptom of psychopathy is social maladjustment . The latter lies in the fact that a person constantly has life difficulties, and these difficulties are experienced either by himself, or by the people around him, or by both. If character traits do not interfere with satisfactory social adaptation, especially if they even contribute to adaptation, this is accentuation, not psychopathy.