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.
Supplement. A biological synapse involving neurons can be: (1) Chemical synapse: the junction between neurons such that the nerve impulse is transmitted from a neuron to another neuron or to a muscle cell or gland cell.(2) Electrical synapse: the gap junction between two apposed neurons that allows faster nerve transmission.Recently, a biological synapse not involving a neuron is found to exist. The junction between a lymphocyte and an antigen-presenting cell is referred to as immunological synapse. biological synapse involving neurons can be: (1) Chemical synapse: the junction between neurons such that the nerve impulse is transmitted from a neuron to another neuron or to a muscle cell or gland cell. (2) Electrical synapse: the gap junction between two apposed neurons that allows faster nerve transmission.