Schizophrenia: Biological Explanations (Brain Structure)
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1
Which three structural abnormalities are discussed?
Enlarged ventricles; reversed cerebral asymmetry; cortical atrophy.
2
What overall biological explanation do these abnormalities support?
Differences in brain structure may affect neuronal activity & cognitive functioning = a biological explanation of schizophrenia.
3
What are ventricles?
Cavities in brain that produce & transport cerebrospinal fluid (CSF).
4
What functions of CSF are given in the notes?
Protection; buoyancy & chemical stability in central nervous system (CNS). Handwritten notes also identify waste removal & nutrient delivery.
5
How many ventricles are present & where are the left / right ventricles described?
4 ventricles. Left & right ventricles extend into frontal; occipital & temporal lobes.
6
Where are the remaining two ventricles described in the slide?
One between left & right thalamus; one between pons & medulla oblongata.
7
How may ventricular enlargement affect brain functioning?
Enlarged ventricles -> reduced neuronal activity in specific brain regions -> impaired language & other schizophrenia symptoms.
8
What language-related example is given for enlarged ventricles?
Enlargement in left temporal region may create added pressure on language-related areas identified as Wernicke's / Broca's areas -> impaired language processing / proficiency -> symptoms such as alogia.
9
How is hydrocephalus described in the handwritten notes?
Increased pressure on brain; used in the explanation linking ventricular enlargement to pressure on language areas.
10
What method & participants did Weinberger (1979) use?
CAT scans comparing 58 individuals with chronic schizophrenia & 56 control participants.
11
What did Weinberger (1979) report?
Ventricles larger in chronic schizophrenia group than control group.
12
What method & findings are given for Andreasen (1988)?
MRI scans: individuals with schizophrenia had ventricles 20-50% larger than controls.
13
What do the ventricular studies illustrate in these notes?
Abnormally enlarged ventricles occur in some individuals with schizophrenia = empirical evidence for structural abnormalities.
14
What is reversed cerebral asymmetry as described in the notes?
Right hemisphere larger than left in individuals with schizophrenia; opposite to pattern described for neurotypical brains.
15
How is left-hemisphere damage / deterioration linked to symptoms?
Damage / deterioration to left hemisphere -> disruption of normal language functioning.
16
What did Luchins et al. (1979) compare?
CAT scans of differently handed individuals with schizophrenia.
17
What did Luchins et al. (1979) find & in which participants?
Increased reversals in frontal & occipital lobes; found only in individuals with schizophrenia who had no other atrophies.
18
What is cortical atrophy?
Degenerative loss of neurons / cortical tissue in cerebral cortex; may be localised or general.
19
What effect of localised cortical atrophy is given in the notes?
Localised atrophy affects cognitive functions associated with affected cerebral cortex.
20
What happens to sulci in cortical atrophy?
Grooves (sulci) widen as cortical tissue is lost.
21
What prevalence of cortical atrophy is given in the PDF?
Printed slide = 20-35% of people with chronic schizophrenia; handwritten version = 29-35%. Both figures appear in the source.
22
What method & finding are given for Vita et al. (1988)?
CAT scans: 33% of individuals with schizophrenia showed moderate to severe cortical atrophy.
23
What additional relationships did Vita et al. (1988) identify?
Relationships between atrophy; gender & ventricular enlargement.
24
How does the table compare ventricular size?
Neurotypical = typically less than 10 mm wide; schizophrenia = enlarged ventricles.
25
How does the table compare neuron numbers?
Neurotypical = approximately 86 billion neurons; schizophrenia = reduced neurons.
26
How does the table compare hemispheric asymmetry?
Neurotypical = left hemisphere typically larger than right; schizophrenia = reversed cerebral asymmetry; right larger than left.
27
How does the table compare sulci?
Neurotypical = smaller grooves; schizophrenia = larger sulci across cerebral cortex.
28
Which four evaluation issues are covered?
Lack of replicability / consistency; difficulty establishing cause & effect; lack of diagnostic specificity & sufficiently advanced scanning; neurodegenerative vs neurodevelopmental explanations.
29
Which studies support the four evaluation issues respectively?
McCarley et al. (1999); Lyon et al. (1981); Roy et al. (1998); Mathalon (2003).
30
What is the replicability criticism of structural brain research?
Structural abnormalities are not consistently reproduced across studies or all individuals diagnosed with schizophrenia = lack of replicability & consistency. Brain differences therefore cannot automatically be treated as universal indicators of schizophrenia.
31
What claim is attributed to McCarley et al. (1999)?
Enlarged ventricles = most reliable physical indicator in schizophrenia. However; structural abnormalities were not consistently found across all affected individuals.
32
Which patient variables did McCarley highlight & why do they matter?
Age; sex / gender & symptom severity influence prevalence & pattern of brain damage. Individual differences help explain why findings vary across samples -> brain changes are not universal to every person with schizophrenia.
33
What methodological conclusion follows from inconsistent structural findings?
Researchers must account for individual participant variables instead of assuming a universal structural pattern. More precise detection techniques are needed for subtle anatomical / physiological differences -> inconsistency limits assigning schizophrenia's origins to brain structure alone.
34
Why is cause & effect difficult to establish for structural abnormalities?
Unclear whether abnormalities cause schizophrenia or arise as a byproduct of living with it. Environmental factors & treatment history can alter brain tissue over time -> structural differences may follow the condition rather than explain its origin.
35
What finding is attributed to Lyon et al. (1981)?
Higher doses of antipsychotic medication correlated with decreased brain tissue density.
36
How does Lyon's finding challenge a causal structural explanation?
Observed abnormalities may reflect long-term medication effects or illness progression. Reduced brain tissue density / cortical atrophy may therefore be a treatment effect or artifact rather than schizophrenia's primary aetiology.
37
What conclusion follows from the cause-or-effect criticism?
Brain scans showing structural abnormalities do not establish those abnormalities as original causes. Medication; environmental influences & illness progression complicate interpretation -> cause & consequence remain difficult to distinguish.
38
What does lack of diagnostic specificity mean for structural abnormalities?
Reduced brain volume & enlarged ventricles are not exclusive to schizophrenia = similar structural findings may occur in other disorders.
39
What finding is attributed to Roy et al. (1998)?
Similar structural anomalies present in bipolar disorder & schizoaffective disorder; these conditions also share overlapping symptom profiles.
40
How do neuroimaging limitations affect interpretation?
Current neuroimaging technology is described as insufficiently sophisticated to isolate subtle differences distinguishing these disorders. Shared abnormalities & overlapping symptoms make it difficult to identify which condition a structural pattern indicates.
41
What conclusion follows for diagnosing schizophrenia?
Structural scans alone cannot provide a refined / definitive differential diagnosis. Lack of specificity & limited detection of subtle differences restrict their value in distinguishing schizophrenia from bipolar or schizoaffective disorder.
42
What is the neurodevelopmental vs neurodegenerative debate?
Unclear whether schizophrenia originates in early neurodevelopmental factors or neurodegenerative processes involving progressive brain tissue loss after onset = uncertainty about how structural differences arise & develop.
43
Which neurodevelopmental & neurodegenerative processes are described?
Neurodevelopmental = exposure to noxious agents in utero; during childhood or adolescence. Neurodegenerative = progressive post-onset brain tissue loss.
44
What model did Mathalon (2003) propose?
Dual-process model: schizophrenia = combination of early neurodevelopmental vulnerability & subsequent neurodegenerative decline.
45
How does Mathalon's model challenge a purely structural account?
Schizophrenia may involve both early vulnerability & later degeneration -> complex; evolving neurobiological process. Viewing it through a purely static structural lens oversimplifies this process = reductionist in nature; structural differences alone do not capture its development over time.
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