The next stages of brain development are more dependent on interactions with the environment, unlike induction, proliferation, and migration, which occur internally throughout foetal development. Following birth and beyond, activities like listening to a voice, responding to a toy, and even the reaction generated by ambient temperature all result in the formation of new connections between neurons.Dendrites—extensions of the cell body that receive signals from other neurons—and axons—extensions from the neuron that can transport messages to other neurons—are two ways neurons become associated.