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The publisher's final edited version of this article is available at Neurosci Biobehav Rev See other articles in PMC that cite the published article. Abstract Adolescence is a transitional period between childhood and adulthood that encompasses vast changes within brain systems that parallel some, but not all, behavioral changes. Elevations in emotional reactivity and reward processing follow an inverted U shape in terms of onset and remission, with the peak occurring during adolescence. However, cognitive processing follows a more linear course of development. This review will focus on changes within key structures and will highlight the relationships between brain changes and behavior, with evidence spanning from functional magnetic resonance imaging fMRI in humans to molecular studies of receptor and signaling factors in animals.
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Veterinary use[ edit ] A breeding mount with a built-in artificial vagina used to collect semen from horses for use in artificial insemination Artificial vaginas are widely used by farms in cattle artificial insemination programs and semen collection centers for collecting animal sperm and its further application. An artificial vagina designed for collecting semen will imitate some or all of the anatomical features and behaviors of an animal's vagina. There are several types of collecting apparatus, but the general design uses a tube with a normally sterile inner liner and hard outer shell. The walls of the tube may be hollow and filled with warm water to mimic a natural body temperature for better results, and may contain a filter to separate the semen. Human use[ edit ] Artificial vagina An artificial vagina, masturbation aid, masturbator, or pocket pussy is designed to simulate the sensation of sexual intercourse on the erect penis and to induce orgasm and ejaculation.
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