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Mental Illness
Schizophrenia
Features of Schizophrenia (Positive Symptoms)
• Positive symptoms– Psychosis
• Hallucinations– Auditory– Visual– Olfactory, somatic
• Delusions– Grandeur– Persecution
Features of Schizophrenia
• Positive symptoms (continued)– Disorganized thought
• Speech• Neologism• Word salad
Features of Schizophrenia
• Positive symptoms (continued)– Disorganized behavior
• Poor grooming• Meals• Inappropriate clothing
Features of Schizophrenia (Negative Symptoms)
• Negative symptoms– Withdrawal– Flat affect (no facial expressions)– Talk little– Lack of motivation
Possible associations
• Blame the mother!
• Prenatal infection
• Genetics
• Brain structure
• Dopamine theory
1. Of course it’s that crappy mother’s fault!
• “Refrigerator mother”
• Notes
2. Viral Infection
• Mom caught the flu during second trimester of pregnancy (months 4-6)
• Also, people with schizophrenia more likely to be born during winter-spring mom was in second trimester during peak of flu season
3. Genetics
• 1% of general population
• Risk of developing schizophrenia appears to be associated with how closely you are related to a person with schizophrenia
• Stress-diathesis model
Figure 15.18 Family relationships and the risk of developing schizophrenia Klein/Thorne: Biological Psychology© 2007 by Worth Publishers
4. Brain Structure
Figure 15.15 MRI scans of the brains of twins discordant for schizophrenia Klein/Thorne: Biological Psychology© 2007 by Worth Publishers
4. Brain Structure
• Larger ventricles
• Decreased activity in prefrontal cortex– Hypofrontality (negative symptoms)
5. Dopamine Hypothesis
• Excessive dopamine activity associated with positive symptoms of schizophrenia
• Drugs that decrease symptoms– Dopamine antagonists
• Drugs that cause schizophrenia-like experiences– Increase activity of dopamine in brain– Amphetamine and cocaine
5. Dopamine Hypothesis
• One of the first medications for schizophrenia– Chlorpromazine– This is an antagonist of dopamine: prevents
dopamine from binding to receptors
– Tardive dyskinesia
Figure 15.12 The synaptic effect of chlorpromazine Klein/Thorne: Biological Psychology© 2007 by Worth Publishers
Mood Disorders
Depression
Depression
• For 2 weeks or more, almost every day• Feelings of sadness• Things are not interesting or fun anymore• Changes in appetite and weight• Problems with sleep• Lethargic/fidgety• Lack of energy• Problems with thinking and concentration• Thoughts of death and suicide
Associated with …
• Life events
• Genetics
• Hormones
• Brain abnormalities
1. Life events
• Too much bad stuff or too little good stuff?
• Learned helplessness
2. Genetics
• Concordance rate for monozygotic (identical) twins: 48%
• Dizygotic twins: 23%
• Adoption studies: account for flaws in other genetic studies
3. Hormones
• Embedded in broader social context:– Post-partum depression– Pre-menstrual dysphoric disorder (PMDD)
4. Hypercortisolism
• Cortisol – stress hormone– Secreted by the adrenal cortex
• Dexamethasone suppression test (DST)– Synthetic hormone that suppresses cortisol in
non-depressed people
How to treat depression
1) Psychotherapy (won’t have time to discuss)
2) Medication
3) Electroconvulsive therapy
2. Medications
• Tricyclics (TCA)– Prevent reuptake of norepinephrine and
serotonin
• Monoamine oxidase inhibitors (MAOI)– Prevent degradation of norepinephrine and
serotonin
• Selective serotonin reuptake inhibitors (SSRI)
Figure 15.5 The synaptic effects of three types of antidepressant drugs Klein/Thorne: Biological Psychology© 2007 by Worth Publishers
2. Medications – Safety
• TCA– Can be dangerous for people with heart
problems
• MAOI– Dangerous if eat food high in tyramine
(cheese, wine, pickles); causes dangerous increase in blood pressure
• SSRI– Fewer and less dangerous side effects
3. Electroconvulsive Therapy (ECT)• Who is it used for?
• How is it done?
• How does it work?
• What are the side effects?
Figure 15.6 Use of electroconvulsive therapy (ECT) to treat major depression Klein/Thorne: Biological Psychology© 2007 by Worth Publishers
Obsessive-Compulsive Disorder
OCD
• Obsession– Thoughts, ideas, images
• Contamination• Something bad happening
• Compulsion– Repetitive behaviors to reduce anxiety caused
by obsession• Clean• Check• Count
OCD
• Time consuming
• Distress, impairment
• Awareness that obsessions and compulsions are excessive
• Stressful trigger
• Genetic component?– Runs in families
• Brain injury or infection– Basal ganglia, frontal lobe, thalamus– Unable to “shut off”
OCD treatments
• Exposure and response prevention
• SSRI
• Surgery: sever connections between frontal lobe and caudate nucleus (in basal ganglia)
Is there such as thing as mental illness?