Which term refers to a cluster of traits characterized by high impulsivity, egocentricity, lack of empathy and deficits in emotional expression?

The answer is "Callous-unemotional traits".

Callous-unemotional traits are described by an absence of sympathy, a dismissal for others' emotions and shallow or insufficient effect, for example, an absence of regret or blame. Neuroanatomical corresponds of callous-unemotional traits have been shown in clinical examples (i. e., youths with troublesome conduct issue). In any case, it is obscure whether unfeeling apathetic characteristics are related with neuroanatomical associates inside regulating populaces without clinical dimensions of aggression or antisocial behavior.