Using analogy-based concept 'sign-machine' to improve LD sign system

To design learning-design curriculum and LDPSS, one biggest obstacle is:

sign-system for LD fail to communicate theories effectively.  

A sign should have full m-mode (enactive-mode, iconic-mode, symbolic-mode)
But, some signs of learning-activity often miss iconic-mode root.

Educational psychology (or theories of learning) is the fundamental course for instructional design. It is difficult to illustrate concepts/rules about learning-activity in images.

Why?

Because we don't have the image of our internal thinking-&-memory activity
Current technology cannot help us locate and see how a sign-in-mind be formed and used. 

The production team of the movie Inside Out consulted from psychologists about the looks of memory, they got the answer: "we really don't know".

I propose to use sign-machine as a starting-point to build some analogy-based physical models for internal-thinking-activity.

Sign-machine is an analogy-based concept.

• A sign-machine is in a person's mind, can do tasks such as recognizing patterns, doing decisions, doing action etc. 
• According to educational semiotics theory, learning is a dynamic process of creating and interpreting sign/sign-system. 
• Sign-machine is a way to visualize how a sign-in-mind is formed, developed, used, modified and connected to other signs-in-mind.