Category: Y

A theory of color vision that assumes three types of cones, usually assumed to be maximally responsive to red, green, and blue. The theory that color vision depends on three different sets of retinal fibers responsible for perception of red, green, and violet. The loss of red, green, or violet as color perceptive elements in…

That segment of the life cycle from ages 18 to 22.  

An experimental method in which the control subject receives the same treatment as the experimental subject on the same schedule. Usually, the two subjects are run at the same time and the experimental subject’s reactions control the events presented to the control subject.  

An alkaloid from the bark of an African tree that is thought by some to have aphrodisiac properties. Yohimbine is an extract from from the bark of Pausinystalia yohimbe tree. Yohimbine is considered the active ingredient of this extract. This chemical has reported functional properties as an alpha-2-antagonist. When alpha-2 receptors are blocked, lipolysis of…

An instrument used in opium smoking.  

A drowsy but restless state during a drug withdrawal period.  

A craving or desire for drugs or foods.  

In sexology, a vaginal infection caused by Candida albicans, often transmitted sexually. A common vaginal infection usually caused by an overgrowth of the Candida fungus that is commonly present in the vagina. Symptoms include intense itching, burning, and redness in the vaginal area. A thick cottage cheese-like discharge is frequently present. Some women with yeast…

One of the two opposing forces in eastern philosophy associated with the earth, heat, brightness, activity, and masculinity.