Importance Neurochemical studies in human aggression point to a modulatory role for a variety of central neurotransmitters. Some of these neurotransmitters play an inhibitory role, while others play a facilitatory role modulating aggression.

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Importance Delayed-onset posttraumatic stress disorder (PTSD) accounts for approximately 25% of PTSD cases. Current models do not adequately explain the delayed increases in PTSD symptoms after trauma exposure. Objective To test the roles of initial psychiatric reactions, mild traumatic brain injury (MTBI), and ongoing stressors on delayed-onset PTSD

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Abstract: Objective: Erectile dysfunction (ED), defined as the inability to achieve or maintain an erection sufficient for satisfactory sexual performance, is the most common sexual problem in men. ED arises when there is disruption of the complex interplay between vascular, neurologic, hormonal and psychologic factors necessary for normal erectile function. It may have a significant effect on quality of life and portend undetected cardiovascular disease.

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