Ego Functions
Ego functions, described by Hartmann as the inborn apparatuses
of autonomy in the beginning of life, are those of synthesis,
integration, regulation, organization, anticipation, tension,
decision making, delay, drive taming, identification, intelligence,
intention, judgment, language, memory, motility, neutralization,
object comprehension, object relations, perception, productivity,
reality testing, self-preservation, speech, symbolization, thinking
and volition. The ego functions also include defense. (The Pearl
Beyond Price, pg 128)

Of course in object relations theory much more
than establishing the self-image is involved in ego development;
it involves an integration of the various developmental achievements
and the various so-called ego functions such as perception, memory,
thinking, synthesis, defense and so on. (The Pearl Beyond Price)

The ego functions develop out of the innate endowment
of the organism, the apparatuses of primary autonomy, which are
necessary for adaptation, and hence for survival and growth.
These functions, including that of defense, contribute to the
maturation of the organism. These functions, in their turn, are
developed and integrated as part of the development of object
relations in the context of interacting with the primary caretakers,
mostly the mother. (The Pearl Beyond Price)