Mood disorders can also be called affective disorders They involve a prolonged and fundamental disturbance of mood and emotions Phobic disorders: A phobia is an extreme irrational fear of some specific object or situation.
DSM-IV-TR identifies three categories of phobia Agoraphobia (without history of panic disorder) Most common (60% of all phobias) Occurs predominantly in women Commonly defined as fear of open spaces Mitchel (1982) – agoraphobia is a form of separation anxiety
Social phobia Intense and excessive fear of being observed by other people E.g eating or drinking in public or talking to the other member of sex Specific phobia Most phobias fall in this category Are very specific Generally less disruptive than agoraphobia Can develop at any point in life
Case study 1: 3-year-old girl suddenly developed recurrent bronchitis Got worse when she attended nursery Trouble was traced to slippers of a boy in the same class Every time the girl saw them she began to retch and cough – became upset Even mention of “Popeye” induced coughing Following behavior therapy, the girl recovered
Case study 2: Obsession without the compulsion Sutherland, 1976 Example of obsession occurring without compulsive behavior is sexual jealousy – extreme case described by Stuart Sutherland (1976): Sutherland was happily married for several years when his wife suddenly revealed she’d been having an affair (but had no wish to end their marriage) At first was able to accept situation Then found that the increased honest actually improved their marriage After asking his wife for further details, he became obsessed – vivid images of his wife in moments of sexual passion with her lover…etc. He had to leave his teaching and research duties After several months of therapy he managed to reduce his obsession sufficiently enough to return to work
Case study 3: Rauch et al. (1994) Simulated OCD symptoms by presenting patients with stimuli especially selected for them E.g. glove contaminated with household rubbish This produced increased blood flow in the PFC and certain regions of the basal ganglia OCD patients have a smaller putamen than controls (Rosenberg et al. 1997)
Major characteristics of PTSD: Increased arousal Persistent defenses of avoidance and repression Intrusions Based on Gelder et al., 1999
Claridge & Davis (2003) suggest mood disorders and anxiety have much in common: Occur more frequently than other types of disorders Symptoms are more continuous than normal personality Considerably symptom overlap between them (e.g. focus on negative and threatening events and stimuli) It has been proposed that there should be a new DSM category – mixed anxiety disorder (MAD)
Claridge & Davis claim there are atleast two distinct forms of depression: Melancholic type Characterized by profound anhedonia Associated with apathy, inactivity, excessive sleeping and severely depressed mood Agitated type Characterized by difficulty in recovering from emotionally stressful events and obvious signs of anxiety and restlessness
What are body rhythms? Body rhythms are biological processes that show cyclical variation over time…ranging from hours to years and reflect the influence of the earths rotation upon us… its living inhabitants, along with plants and animals. There are three rhythms that we will focus our attention upon throughout this module. Circadian Infradian, and ultradian biological rhythms.
Body rhythms cont… Circadian rhythms: (circa = approx & diem = day) go over 24hrs. Humans demonstrate a series of changes including temperature heart respiration and metabolism over this period. We (psychologists) are most interested in the sleep-wake cycle. Ultradian rhythms: (Meaning less than one day) Sleep is a good example of an ultradian rhythm, as you sleep you pass through differing stages of sleep (e.g. light and deep sleep lasting about 90 minutes.)
Body rhythms cont… Infradian rhythm: (meaning more than 1 day). An example of a infradian rhythm would be a womans menstrual cycle which lasts for 28 days. A circannial cycle occurs yearly/annually. An example of this would be non human animals hibernation and waking patterns.
Research studies into Circadian rhythms. Siffre (1975) Spent 6 months inside a cave and found that his natural Circadian rhythm was just over 24hrs, but would sometimes change to 48hrs. There were no zeitgebers such as natural light or sounds. He had no idea what time it was, although he did have contact with outside world via telephone. He had food and drink and so on. His behaviour such as when he slept/woke and when he ate his meals was monitored. From this study it was concluded our internal clock must have a 25 hr cycle and that our zeitgebers must reset the clock to our usual 24-hr day.
Research studies into infradian rhythms. Monthly cycles...the function of this cycle is to regulate ovulation.
Research studies into infradian rhythms. Seasonal Affective Disorder (SAD). Research has shown that the hormone melatonin is secreted when it is dark...the more darkness...the more melatonin. This leads to severe disruption in mood.
Evaluation of studies into infradianrhythms. Menstrual cycles can also be disrupted by other factors as well as hormones...research has shown that when a several women live in a house together and they are not taking oral contraceptives they tend to fall in line with each other and menstruate at the same time this be possibly due to pheromones being released chemically and giving a scent. SAD a greater understanding of this condition has lead to successful therapies such as phototherapy- very strong lights to increase the level of melatonin.
The role of Endogenous pacemakers &Exogenous Zeitgebers. The main pacemaker for endogenous (internal) rhythms is the suprachiasmatic nucleus (SCN). This is a small group of cells located in the area of the brain called the hypothalamus. Its called the SCN because it lies just above the optic chiasm, therefore it can receive information directly from the eye and the rhythm can be rest by the amount of light entering the eye.
The consequences of disruptingBiological rhythms. When external cues change we have to re-adjust our internal clock……. JET LAG SHIFT WORK.