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Attention Deficit Hyperactivity Disorder (ADHD) Attention Deficit Hyperactivity Disorder (ADHD) is one of the most common childhood disorders, characterized by inattentiveness, hyperactivity,…

Addiction Addiction is defined as a psychological and/or physiological dependency on a particular substance or event. Common addictions include illegal drugs, alcohol, tobacco,…

Achromatopsia Achromatopsia is a form of visual agnosia which results in the loss of color vision. The acquired form of this disorder…

Absolute Threshold The minimum amount of stimulation required to trigger a reaction or produce a sensation. The absolute threshold is measured across…

Abnormal Abnormal is a term that refers to something that deviates from what is considered normal or typical. In the context of…