Glossary H

Hyperactive refers to the display of an unusually high level of energy and an inability to remain still or quiet.

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Hyperactive/Impulsive is a form of ADHD in which people show both hyperactive and Impulsive behavior, but are able to pay

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Hyperactivity refers to a term that describes a higher than normal level of activity. This may apply to behavior, and an organ can also be described as hyperactive if it is more active than usual.

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Hyperacusis refers to excessive auditory sensitivity

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Hyperarousal refers to a response to exposure to violence and trauma including low threshold for startle response, increases in heart rate, sleep disturbance, anxiety, and motor hyperactivity.

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Hyperbaric chamber is chamber where the absolute pressure is increased above atmospheric pressure.

Hypercomplex (end-stopped) cell refers to a cell of the visual cortex that responds best to stimuli of a precisely limited type, anywhere in a large receptive field, with a strong inhibitory field at one end of its field

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Hyperdensity is defined as increased density of brain tissue that typically signals an abnormal density such as seen in tumor or bleeding.