Inhibitory Synapses and Neurons and Competition Between CAs

• It's also important to note that synapse can also be inhibitory.
• When a neuron fires, it can make it less likely that the post-synaptic neuron will fire.
• Some neurons are considered inhibitory so that all post-synaptic neurons are inhibitted when the pre-synaptic neuron fires.
• The evidence seems to point to the pre-post-synaptic neuron pair being relevant so that a neuron can be both excitatory and inhbitory but only by pair.
• We typically model inhibition with synaptic weights being negative.
• Note that this means CAs, which consist of neurons, can compete with each other.
• As CA1 becomes active (ignites), it can inhibit CA2. CA2 can inhibit CA1 also, and they are thus in a competition.
• This (perhaps with global inhibition) can be used to make winner take all networks.