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A photograph shows several key members of the United States military accompanied by a crowd as they stand facing toward a wreath. All hold their right arms in salute or placed across their chests.
A wreath is laid in memoriam to victims of the Washington Navy Yard shooting. (credit: modification of work by D. Myles Cullen, US Department of Defense)

On Monday, September 16, 2013, a gunman killed 12 people as the workday began at the Washington Navy Yard in Washington, DC. Aaron Alexis, 34, had a troubled history: he thought that he was being controlled by radio waves, and a month earlier, he had complained of noises coming from the linen closet in his military housing. He called the police to complain about voices in his head and being under surveillance by “shadowy forces” (Thomas, Levine, Date,&Cloherty, 2013).

While Alexis’s actions cannot be excused, it is clear that he had some form of mental illness. Mental illness is not necessarily a cause of violence; it is far more likely that the mentally ill will be victims rather than perpetrators of violence (Stuart, 2003). If, however, Alexis had received the help he needed, this tragedy might have been averted.

This chapter will clarify what psychological disorders are, how they are diagnosed and classified, their symptoms, and insights into their causes.

References

Abela, J. R.,&Hankin, B. L. (2011). Rumination as a vulnerability factor to depression during the transition from early to middle adolescence: A multiwave longitudinal study. Journal of Abnormal Psychology, 120 , 259–271.

Abramowitz, J. S.,&Siqueland, L. (2013). Obsessive-compulsive disorder. In L. G. Castonguay&T. F. Oltmanns (Eds.), Psychopathology: From science to clinical practice (pp. 143–171). New York, NY: Guilford Press.

Abramson, L. Y., Metalsky, G. I.,&Alloy, L. B. (1989). Hopelessness depression: A theory- based subtype of depression. Psychological Review, 96 , 358–372.

Afifi, T. O., Mather, A., Boman, J., Fleisher, W., Enns, M. W., MacMillan, H.,&Sareen, J. (2010). Childhood adversity and personality disorder: Results from a nationally representative population-based survey. Journal of Psychiatric Research, 45 , 814–822.

Agerbo, E., Nordentoft, M.,&Mortensen, P. B. (2002). Familial, psychiatric, and socioeconomic risk factors for suicide in young people: Nested case-control study. British Medical Journal, 325 , 74–77.

Aghukwa, C. N. (2012). Care seeking and beliefs about the cause of mental illness among Nigerian psychiatric patients and their families. Psychiatric Services, 63 , 616–618.

Aikins, D. E.,&Craske, M. G. (2001). Cognitive theories of generalized anxiety disorder. Psychiatric Clinics of North America, 24 , 57–74.

Akinbami, L. J., Liu, X., Pastor, P.,&Reuben, C. A. (2011, August). Attention deficit hyperactivity disorder among children aged 5–17 years in the United States, 1998–2009 (NCHS data brief No. 70). Hyattsville, MD: National Center for Health Statistics. Retrieved from http://www.cdc.gov/nchs/data/databriefs/db70.pdf

Alden, L. E.,&Bieling, P. (1998). Interpersonal consequences in the pursuit of safety. Behaviour Research and Therapy, 36 , 53–64.

Alegria, A. A., Blanco, C., Petry, N. M., Skodol, A. E., Liu, S. M.,&Grant, B. (2013). Sex differences in antisocial personality disorder: Results from the National Epidemiological Survey on Alcohol and Related Conditions. Personality Disorders: Theory, Research, and Treatment, 4 , 214–222.

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
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cm
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
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2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
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progressive wave
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A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Source:  OpenStax, Chapter 13: psychological disorders sw. OpenStax CNX. Jun 08, 2015 Download for free at https://legacy.cnx.org/content/col11811/1.1
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