More on the 7th and 8th functions from http://socion.info/miscmodelofthepsyche.html

ID Block The ID block primarily controls instinctual impulses. As a child, a person remains under the primary influence of the ID. However, Because of their nature, the functions within the ID Block cannot compete against the functions within the EGO block. Though they are typically very strong, the influence of the functions within the EGO Block may cause a person to disregard them and in result, feel that they are exceptionally weak and useless. An adult person may never really know that they have them as strength; some may even deny their very existence. However, a person is more likely to disregard the 8th function than they are to disregard the 7th function. Theoretically, This may result in that a person could have a conscious idea of the effects of their 1st function, and can discern the introverted and extroverted aspects of the function and their strengths with little effort. Yet the 2nd requires some effort, and may cloak the strengths of the 8th; it may never fully function in result. A person under strong influence of this block may appear irresponsible, uncaring, selfish, conceited, and arrogant.

Strong, Subconscious, Accepting - 7th function - the seventh function manifests itself as an instrument of instinctual aggression, intended to serve and protect the basic interest of an individual. A person wants, and wants immediately. In result, a person under the influence of this function may subconsciously reproduce and model behaviors that appear arrogant, haughty, conceited, selfish, or inconsiderate in relation to the function involved.

Strong, Subconscious, Producing - 8th function - Without the suppression of the second function, this function needs guidance, as it must use a concrete means to manage itself. When unrestrained, a person may realize this function chaotically and without self-control, appearing indulgent and uncanny. People under the influence of the 8th function may have no direction and no productive aims or goals besides the self-gratification of the manifested function involved.