Final answer:
The Eysencks' third personality dimension, psychoticism versus superego control, has received less attention than the original dimensions of extroversion/introversion and neuroticism/stability in the study of personality psychology.
Step-by-step explanation:
Psychologists Hans and Sybil Eysenck proposed a personality model initially based on two specific dimensions: extroversion/introversion and neuroticism/stability. However, they later introduced a third dimension: psychoticism versus superego control. While extroversion/introversion and neuroticism/stability received considerable attention and integration into various personality theories, the psychoticism versus superego control dimension has received less attention than the others. This later addition attempts to describe a range where individuals high on psychoticism tend to show traits like being independent thinkers, cold, nonconformists, impulsive, and sometimes antisocial, in contrast to those high on superego control who show traits of high impulse control, altruism, empathy, and conventional behavior.