Download - 1 Chapter 16 Schizophrenia
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Chapter 16
Schizophrenia
http://www.npr.org/programs/atc/features/2002/aug/schizophrenia/
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Schizophrenia
A serious mental disorder characterized by disordered thoughts, delusions, hallucinations, and mood disturbance.
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Schizophrenia
Positive SymptomsDelusionsHallucinationsDisorganized behavior
Negative SymptomsSocial withdrawalMood disturbanceReduced motivation
John Nash
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Schizophrenia May Have Several Outcomes
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Genetics and Schizophrenia Concordance rate in identical twins is 50%. Adoption studies support a strong genetic role. As many as 70 genes may be involved.
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A Possible Genetic MarkerA majority of patients and 45% of their relatives show abnormal intrusions of saccades in smooth pursuit tasks.
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Treatment of Schizophrenia
No effective treatments prior to about 1950 Discovery of chlorpromazine (Thorazine)
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SchizophreniaPositive symptoms
Dopamine hypothesis:Overactivity of dopamine in
mesolimbic pathway (VTA to nucleus accumbens and amygdala)
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SchizophreniaHow are positive symptoms related to
dopamine?
Hypothesis: Mesolimbic system important for reinforcement of behavior We all have irrational thoughts, but usually brush them aside But if mesolimbic system was active when the thought
occurred, we might take it more seriously, leading to delusions
Confirming piece of evidence: schizophrenics often report euphoria at onset of positive symptoms
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Hypothesis cont.: Disordered thinking?
System so active that it does not discriminate between thoughts, making it hard to follow a logical sequence
Terrifying element of delusions?Strong dopaminergic projection to amygdala
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Dopamine HypothesisEvidence for excessive dopamine
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Dopamine and Schizophrenia Dopamine agonists
(cocaine, amphetamine) produce symptoms of psychosis.
Dopamine antagonists reduce psychotic behavior.
Patients may have abnormalities involving dopamine autoreceptors.
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SchizophreniaPositive Symptoms
Chlorpromazine: A “typical neuroleptic” A dopamine receptor blocker for D2 receptors
Clozapine: An “atypical neuroleptic” An antipsychotic drug that blocks D4 receptors
in the nucleus accumbens
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Long-term Use of Typical Neuroleptics Often Produce Serious Side Effects
Tardive dyskinesia involves tremors and involuntary movements.
Supersensitivity: increased sensitivity of neurotransmitter receptors (D2) to dopamine
Due to side effects, about 50% now use atypical neuroleptics like clozapine.
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Dopamine HypothesisEvidence for increase in D3 receptors
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Problems With a Excessive Dopamine Hypothesis 25% of patients do not respond to dopamine
antagonists. Atypical antipsychotic medications (clozapine) act
primarily on neurotransmitters other than dopamine.
Drugs change dopamine activity immediately, but patient may not improve for weeks.
PCP produces symptoms similar to schizophrenia by blocking the NMDA glutamate receptor.
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SchizophreniaNegative symptoms
Brain damage:Many of the negative symptoms are
also seen in people with brain damage
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Search for Brain AbnormalitiesEvidence for changes in ventricular size
Courtesy D.R. Weinberger, NIMH, St. Elizabeth’s Hospital, Washington, D.C.
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Schizophrenia and the Hippocampus
Cell bodies in a control participant are arranged neatly.
Cell bodies in a participant diagnosed with schizophrenia appear relatively disorganized.
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Search for Brain AbnormalitiesLoss of gray matter with age
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Search for Brain AbnormalitiesLoss of gray matter with age
Cause of delay of onset??
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The Hypofrontality Hypothesis Lower frontal lobe
activity may account for the negative symptoms of schizophrenia.
During rest (top) and an effortful cognitive test (bottom), patients with schizophrenia show less frontal lobe activity.
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How are positive & negative symptoms related?
VTA
PrefrontalCortex
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DopamineHypoactivity(too little DA)
GABA neurons
Dopamine hyperactivity(too much DA)
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Possible Causes of Brain AbnormalitiesSeasonal Effect
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Possible Causes of Brain AbnormalitiesSeasonal Effect – Flu in 2nd trimester
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Possible Causes of the Brain Abnormalities
Latitude effect: The increased incidence of schizophrenia in
people born far from the equator.Nutritional deficiency
Hunger Winter studyThiamine deficiencyVitamin D deficiency (latitude effect?)
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Possible Causes of the Brain Abnormalities
Father’s AgeLate 20s 1:121 people schizophrenic50s 1:47 people schizophrenic
Why?Maybe problem with spermatocytes
Produce sperm Must replicate every 16 days Possible copying errors
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Possible Causes of the Brain Abnormalities
Rh incompatibility Mother Rh neg, 1st baby Rh pos, 2nd baby Rh pos (antibodies attack)
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Schizophrenia
Early warning signs for children with abnormal prenatal development]\:
Children who developed schizophrenia displayed more negative affect in their facial expression and were more likely to show abnormal movements.
Children who developed schizophrenia also displayed poor social adjustment and did more poorly in school than their peers.