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Virtual games, such as World of Warcraft, The Sims, and Second Life, are played by thousands every day, allowing people, worldwide, to connect and share information. In fact, the virtual "worlds" that can be created in these games are now being used to make money (through buying and selling virtual objects), to form partnerships and friendships, and even to conduct business; it is easy to see how many become engrossed in this alternative life.

Part 1 of this article, discussed a general approach to treating psychiatric emergencies in patients with bipolar and related disorders, as well as the assessment and management of agitation and impulsive aggression. Part 2 focuses on psychosis, suicidality, and specific treatments relevant to patients in emergency settings who are agitated or have bipolar disorder.

Many of the things that we busy ourselves with have no apparent utility. Blogging, playing games, and collecting come to mind. To declare that we are compelled to do these things may be too strong, but we do pursue these activities with little deliberation and without concern as to their usefulness. The ubiquity of these pursuits suggests that these activities or their variants helped humans survive at some point and that they now rest on innate brain programs.

Marijuana is the most commonly used illicit drug in the United States and worldwide. Initiation of use typically occurs during adolescence. The most recent epidemiological data indicate that in the United States, 42% of high school seniors have tried marijuana, 18% have used it in the past 30 days, and 5% use it daily.

Almost one third of US mental health care costs (approximately $50 billion) go toward the treatment of anxiety disorders. Conventional pharmacological treatments for anxiety are often beneficial but have limited efficacy.

One consequence of the "graying" of the world's population is that psychiatrists, along with all health care professionals, will increasingly be providing services to older adults. In the United States, the first set of people belonging to the baby boom generation turned 60 in 2005, and the number of people older than 60 will soonoutnumber children for the first time in recorded history.

The degree of asphyxia is best ascertained by measuring the amount of fetal acidosis determined by umbilical arterial blood. An umbilical arterial pH of less than 7.0 is seen in about 0.3% of deliveries.1 It indicates a severity of acidosis that places the fetus at risk for permanent neurological damage because of asphyxia. However, the outcome of infants with umbilical cord pH of less than 7.0 who required neonatal intensive care is relatively good. Eighty-one percent can be expected have a normal examination at discharge.

Near the top of your wish list might be a way to selectively turn on or off individual wires in the black box, because it would allow you to falsify causal linkages, associating observable changes in robotic behavior with your manipulations.

All of us have heard the phrase "between a rock and a hard place," and many of us have been in the situation that the idiom describes. However, few of us (other than English professors) likely know the origin of the saying and even fewer of us know how it applies to clinical psychiatry. Delving into these seemingly unrelated queries will be the subject of this month's column.

In 20 years of dealing with severe schizophrenia in her sister and daughter, it occurred to psychologist Joyce Burland, PhD, that she "had never been given any instruction on how to be helpful to them," so in 1991, she wrote up a highly structured course with a standardized curriculum and training guide.

In part 1 of this essay, I argued that individual freedom is not only compatible with determinism but dependent on it. I also argued that freedom is not an "either/or" condition. Rather, actions may be more or less free, and therefore, more or less "responsible," depending on a number of contingent factors, yielding various degrees of freedom. Psychiatrists, I suggested, can be most helpful in so far as we can describe, study, and categorize these degrees of freedom and the psychopathological conditions that undermine them. In part 2, I elaborate on the "naturalistic" model of freedom and autonomy and suggest how it may be applied to psychiatric disorders and medico-legal determinations of culpability.

The American Academy of Child and Adolescent Psychiatry recently published a practice parameter with evidence-based guidelines for the assessment and treatment of children and adolescents with attention-deficit/hyperactivity disorder (ADHD). Recommendations for the best treatment practices were made based on empirical evidence and clinical consensus, and the strength of these recommendations was based on the extent and degree of these variables. This column will provide a summary of the parameter.

A recent 4-year study linked apathy to a hastened decline in persons with Alzheimer disease (AD). Another recent study found that persons with mild cognitive impairment (MCI) were more likely to convert to AD a year later if they also had apathy.

Short of mass screening of the elderly using a neuropsychological test or some yet-to-be-determined biomarker, persons with cognitive disorders come to the attention of the health care system only when symptoms are recognized. Occasionally, physicians identify cognitive deficit on routine examination or when they notice patients having trouble following instructions (eg, taking medications properly)

In 1993, Charles Grob, MD, professor of psychiatry and pediatrics at the University of California, Los Angeles (UCLA) School of Medicine, and a research team were invited to study the physical and psychological effects of ayahuasca, a plant mixture that produces psychedelic effects.