ANS / CNS
There is a fair amount of debate about whether the trained knee-jerk response of the ideogram comes from the Autonomic Nervious System (ANS) or the Central Nervous System (CNS). Both systems carry out various automatic functions within the body. As far as the viewer is concerned, the trained knee-jerk response which produces the ideogram is simply the body responding to some target knowledge which is located within the subconscious mind. The viewer needs to worry about training accuracy into the response, rather than worrying about which internal system is doing the job.