Neuroscientist Jaak Panskepp argues that of seven core instincts in the human brain (anger, fear, panic-grief, maternal care, pleasure/lust, play, and seeking), seeking is the most important. All mammals have this seeking system, says Panskepp, wherein dopamine, a neurotransmitter linked to reward and pleasure, is also involved in coordinating planning activities. This means animals are rewarded for exploring their surroundings and seeking new information for survival. It can also explain why, if rats are given access to a lever that causes them to receive an electric shock, they will repeatedly electrocute themselves.