Serotonin regulates a wide variety of brain functions and behaviors. Here, we synthesize
previous findings that serotonin regulates executive function, sensory gating, and social …

Emotion is normally regulated in the human brain by a complex circuit consisting of the
orbital frontal cortex, amygdala, anterior cingulate cortex, and several other interconnected …

An essential component of the human diet, L-tryptophan is critical in a number of metabolic
functions and has been widely used in numerous research and clinical trials. This review …

Crime rates have risen steadily in nearly all countries that keep accurate records (Rutter,
Giller, & Hagell, 1998). More dramatic has been the increase in violent crime by young …

In human and non-human animals the steroid hormones cortisol and testosterone are
involved in social aggression and recent studies suggest that these steroids might jointly …

Evidence from diverse literatures supports the viewpoint that two modes of self-regulation
exist, a lower-order system that responds quickly to associative cues of the moment and a …

—Martin Luther King Jr.(1929–1968) There is little doubt that aggression was an adaptive
behavior for many of our ancient ancestors who lived in small groups. Males used …

Background and rationale The term 'action inhibition'encapsulates the ability to prevent any
form of planned physical response. Growing evidence suggests that different 'stages' or …

Alterations in brain tryptophan levels cause changes in brain serotonin synthesis, and this
has been used to study the implication of altered serotonin levels in humans. In the acute …

Research indicates that individual differences in human personality can be summarized by
three to five independent dimensions (1). Status on each of these dimensions is stable over …