# HG changeset patch
# User Robert McIntyre <rlm@mit.edu>
# Date 1398644722 14400
# Node ID 8a5abd51cd4f172381e1e82bf2a1864ec055370b
# Parent  39ee58fef9d8936886cd4f31cb0d3df9fd781a57
add example / discussion per Winston's request.

diff -r 39ee58fef9d8 -r 8a5abd51cd4f thesis/cortex.org
--- a/thesis/cortex.org	Sun Apr 27 10:17:45 2014 -0400
+++ b/thesis/cortex.org	Sun Apr 27 20:25:22 2014 -0400
@@ -2816,7 +2816,7 @@
    /empathy/ function will provide a bridge to use the body centered
    action predicates on video-like streams of information.
    
-** Empathy is the process of tracing though \Phi-space 
+** Empathy is the process of building paths in \Phi-space
 
    Here is the core of a basic empathy algorithm, starting with an
    experience vector:
@@ -2845,10 +2845,54 @@
 
    Finally, to infer sensory data, I select the longest consecutive
    chain of experiences that threads through the sets of similar
-   experiences. Consecutive experience means that the experiences
-   appear next to each other in the experience vector.
-
+   experiences, starting with the current moment as a root and going
+   backwards. Consecutive experience means that the experiences appear
+   next to each other in the experience vector.
+
+   A stream of proprioceptive input might be:
    
+   #+BEGIN_EXAMPLE
+   [ flat, flat, flat, flat, flat, flat, lift-head ]
+   #+END_EXAMPLE
+
+   The worm's previous experience of lying on the ground and lifting
+   its head generates possible interpretations for each frame: 
+
+   #+BEGIN_EXAMPLE
+   [ flat, flat, flat, flat, flat, flat, flat, lift-head ]
+      1     1     1     1     1     1     1     4     
+      2     2     2     2     2     2     2   
+      3     3     3     3     3     3     3
+      7     7     7     7     7     7     7
+      8     8     8     8     8     8     8
+      9     9     9     9     9     9     9
+   #+END_EXAMPLE
+   
+   These interpretations suggest a new path through phi space:
+   
+   #+BEGIN_EXAMPLE
+   [ flat, flat, flat, flat, flat, flat, flat, lift-head ]
+      6     7     8     9     1     2     3     4
+   #+END_EXAMPLE
+
+   The new path through \Phi-space is synthesized from two actual
+   paths that the creature actually experiences, the "1-2-3-4" chain
+   and the "6-7-8-9" chain. The "1-2-3-4" chain is necessary because
+   it ends with the worm lifting its head. It originated from a short
+   training session where the worm rested on the floor for a brief
+   while and then raised its head. The "6-7-8-9" chain is part of a
+   longer chain of inactivity where the worm simply rested on the
+   floor without moving. It is preferred over a "1-2-3" chain (which
+   also describes inactivity) because it is longer. The main ideas
+   again:
+   
+   - Imagined \Phi-space paths are synthesized by looping and mixing
+     previous experiences.
+
+   - Longer experience paths (less edits) are preferred.
+
+   - The present is more important than the past --- more recent
+     events take precedence in interpretation.
 
    This algorithm has three advantages: