Connections between neurons are said (by Wikipedia) to be strengthened as part of learning - can they also be weakened (below the original level)?
I understand the concept of the connections strengthening. After reading the article Ants Swarm Like Brains Think, my understanding is that positive feedback (I forget the words that I should use for positive vs negative action potentials) should strengthen the connection, and negative feedback should weaken it.
I'm interested to know whether neural connections can weaken below their original connection strength.
I'm curious about this so as to grasp the way that the human brain (or even simply the ant brain) learns good and bad. If I'm not completely wrong about what I'm asking, then I think I get it pretty well: The things that are good (like finding food) trigger positive feedback among the associated neuron groups, and the things that are bad (like pain or danger) trigger negative feedback in the associated neurons, and that's basically how brains learn good from bad.