In horse racing, these definitions may differ: For example, in the British Isles, Thoroughbred horse racing defines colts and fillies as less than five years old. However, Australian Thoroughbred racing defines colts and fillies as less than four years old.
For the general concept of brain plasticity, see neuroplasticity. In neuroscience, synaptic plasticity is the ability of synapses to strengthen or weaken over time, in response to increases or decreases in their activity. Plastic change also results from the alteration of the number of neurotransmitter receptors located on a synapse.
Synapse. Neurons do not quite touch. The synapse (or synaptic cleft) is the small gap (about 20nm) between the pre-synaptic terminal button and the post-synaptic neuron (and, more closely, the pre-synaptic membrane and the post-synaptic membrane).Neurotransmitters cross this gap and either excite or inhibit the post-sypnaptic neuron.ynapse. Neurons do not quite touch. The synapse (or synaptic cleft) is the small gap (about 20nm) between the pre-synaptic terminal button and the post-synaptic neuron (and, more closely, the pre-synaptic membrane and the post-synaptic membrane).