Eysenck is to do with psychology not maths and he developed the ideas of personality types of extroversion introversion and neuroticism think again...

An infant's temperament refers most directly to its emotional excitability. Temperament refers to aspects of a person's personality, like extroversion or introversion, in psychology.

An ambiversion is a personality trait where a person shows balanced characteristics of both extroversion and introversion.

where a subject's energy is taken from and where a subject puts their attention

where a subject's energy is taken from and where a subject puts their attention