Figure 9.
Detailed tracks of the feed forward synapse to the cortical cell during the learning process. The shaded area delimits the region wherein the connection is inhibitory. The synapse changing sign signifies that the B1 connections have to change to those in B2 in Figure 5. (A) A synapse that if briefly positive in two instances but ends up negative. (B) A synapse that is positive for most of the learning process but ends up slightly negative. (C) A synapse that starts out positive but very soon becomes negative and remains so. (D) A synapse that decreases in strength but is always positive.