anxious: (n. anxiety) A feeling of dread over some potential or upcoming situation, usually one over which someone feels they have little control.
behavior: The way something, often a person or other organism, acts towards others, or conducts itself.
cell: (in biology) The smallest structural and functional unit of an organism. Typically too small to see with the unaided eye, it consists of a watery fluid surrounded by a membrane or wall. Depending on their size, animals are made of anywhere from thousands to trillions of cells.
circuit: A network that transmits electrical signals. In the body, nerve cells create circuits that relay electrical signals to the brain. In electronics, wires typically route those signals to activate some mechanical, computational or other function.
depression: (in medicine) A mental illness characterized by persistent sadness and apathy. Although these feelings can be triggered by events, such as the death of a loved one or the move to a new city, that isn’t typically considered an “illness” — unless the symptoms are prolonged and harm an individual’s ability to perform normal daily tasks (such as working, sleeping or interacting with others). People suffering from depression often feel they lack the energy needed to get anything done. They may have difficulty concentrating on things or showing an interest in normal events. Many times, these feelings seem to be triggered by nothing; they can appear out of nowhere.
disorder: (in medicine) A condition where the body does not work appropriately, leading to what might be viewed as an illness. This term can sometimes be used interchangeably with disease.
focus: (in behavior) To look or concentrate intently on some particular point or thing.
midbrain: An area of the brain located at the top of the brain stem, in the roughly the center of the head. Areas of the midbrain play important roles in sleep, motivation, movement, body temperature and more.
neuron: The main cell type of the…
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