Psych 2101 Flashcards
- What is a mental disorder?
A mental disorder is characterized by a clinically significant disturbance in an individual’s cognition, emotional regulation, or behaviour. It is usually associated with distress or impairment in important areas of functioning.
- What is classification?
Classification is “the act or process of dividing things into groups according to their type”(Cambridge dictionary)
Mental disorders, however, are classified by symptoms that meet specific “diagnostic criteria”.
- Why should we classify mental disorders?
Most medical disorders are classified by results of biological testing. * Ex. Diabetes and fasting glucose + glucose tolerance test
Mental disorders are classified by observable behaviours (signs) and self-reported feelings and thoughts (symptoms).
Who is emil kraepelin? (Defined 15 categories of mental disorders based on common patterns of symptoms, Most famous for the “Krapeliniandichotomy”: dementia praecox (schizophrenia) vs manic depression)
Why should mental disorders be classified at all?
It’s debatable, but there are some good reasons:
* Provides a common vocabulary across psychologists, psychiatrists, GPs, social workers, governments, etc.
* Provides a guide for treatment
* Can be used in legal settings → see if they are fit to stand trial or lesser sentencing
Some disadvantages:
* Stigma
* Changes self-concept (e.g., being “abnormal”)
* Insurance problems
- How do we classify mental disorders?
categorical approach
dimensional approach
transdiagnostic approach
what is the categorical approach
The categorical approach
Based on DSM-V or ICD-11 criteria
Diagnostic categories include disorders, subtypes, and changes overtime
There are 22 diagnostic categories in the dsm5
Limitations of the categorical approach
Including a disorder in the DSM or ICD makes people believe that the disorder is real
* A real category, different from others. → isolates people
* Ignores overlap between disorders.
* People classified with the same disorder may have few symptoms in common.
(eg internert gaming disorder)
Example of categories not matching reality → a platypus
what is the dimensional approach
The dimensional approach
* Not yes or no (i.e., you’ve got it or you don’t), but how much?
* Each i* Most mental disorders can be described along a number of symptom dimensions individual receives a score on several different ‘dimensions’ of psychopathology. This includes emotional symptoms (fear), cognitive symptoms (fear of losing control/dying/derealisation), and physical symptoms (sweating)
Example
* Hallucinations and delusions are distributed continuously in the population.
* Subclinical psychotic experiences (8%)
* Subclinical psychotic symptoms which are associated with a degree of distress and help-seeking behaviour but do not necessarily amount to clinical psychotic disorder (prevalence
around 4%).
* Psychotic disorder (3%)
Beck Depression Inventory is a dimensional approach
Minnesota Multiphasic Personality Inventory (MMPI)
First developed in 1943, updated in 1989, 2008, and 2018
* 10 ‘dimensions’ (clinical scales) of psychopathology along which people differ e.g., hypochondriasis (HS), depression (D), paranoia (PA), psychasthenia (PT), hypomania (MA), psychopathic deviate (PD) etc.
* Individual’s score on each dimension is compared to population norms
Millon Clinical Multiaxial Inventory
>20 dimensions
With loads of dimensions can defeat the purpose of the easy classification mechanism → plus no common communication between each group
Limitations of the Dimensional Approach
* No common vocabulary
* Unwieldly
* Implications for treatment?
* Knowing severity of disorder may not impact treatment plan.
* E.g., what’s the best way to treat someone who is high on hypochondriasis, but low on depression, but high on social introversion, but low on paranoia etc….
* Does a consistent pattern map on to a specific diagnostic category?
what is the transdiagnostic approach
The transdiagnostic approach
Very new approach (last 10 years)
National Institute of Mental Health’s (USA) Research Domain Criteria
Launched in 2009
Characteristics of RDoC:
* Holistic approach
* Understanding interaction between brain development, social factors, and lifespan to identify multiple dimensions that may produce mental illness.
* Study of biological processes and behavior that are part of interpersonal and sociocultural milieu
* From genes and cells to human behaviour
Not for immediate clinical use
Will take many years of research before it will influence classification
draw the RDoC diagram
draw the RDoC diagram
domains
- negative valence
- positive valence
- cognitive symptoms
- systems for social processes
- arousal/regulatory systems
-sensorimotor systems
environment:
circuits:
neural systems –> genes, moleculles, cells
behavioural dimensions –> physiology, behaviour, self reports
neurodevelopment
what is negative valence
- acute threat fear
- potential threat anxiety
- sustained threat
- loss
-frustrative non reward
what is positive valence
approach motivation
- reward valuation
- effort valuation
- expectancy
-action selection
initial responsiveness to reward
sustained responsiveness to reward
reward learning
habit
what is cognition?
attention
perception
- visual
-auditory
-olfactory
declarative memory
language behaviour
cognitive control
- goal selection, updating, representation, and maintenance
- response selection
- inhibition
-performance monitoring
working memory
- active maintenance
- flexible updating
- limited capacity
- interference control
what is HiTOP?
The hierarchical taxonomy of psychopathology (HiTOP) splits the world into internal and external
Advantages of Categorical
Common vocabulary, aids in communication
Provides a guide for treatment and prognosis
Advantages of Dimensional
Closer to reality?
Doesn’t require arbitrary distinctions between normality and abnormality
what is a categorical v dimensional approach
A categorical approach to assessment relies on diagnostic criteria to determine the presence or absence of disruptive or other abnormal behaviors (e.g., Diagnostic and Statistical Manual of Mental Disorders or DSM-IV, APA, 2000), whereas a dimensional approach places such behaviors on a continuum of frequency and/or severity (e.g., Child Behavior Checklist or CBCL, Achenbach & Edelbrock, 1983; Lavigne et al., 1996).
which approach does the dsm use?
categorical
what is a Taxometrics
Taxometrics is a statistical procedure for determining whether relationships among observables reflect the existence of a latent taxon (type, species, category, disease entity).
what is RDoC?
RDoC is a research framework for new approaches to investigating mental disorders. It integrates many levels of information (from genomics and circuits to behavior and self-reports) in order to explore basic dimensions of functioning that span the full range of human behavior from normal to abnormal.
“RDoC is an attempt to create a new kind of taxonomy for mental disorders by bringing the power of modern research approaches in genetics, neuroscience, and behavioral science to the problem of mental illness.”
Research domains encompass various fields of study that contribute to the advancement of knowledge and understanding in different areas. They provide specialized frameworks for conducting research and generating insights within specific disciplines.
- What are psychometrics?
- The branch of psychology dealing with the design, administration, and interpretation of quantitative tests for the measurement of psychological variables
- Psyche = mind, metric = measure
- Psychometrics involves the measurement of directly unobservable mental constructs (e.g., intelligence, aptitude, personality, etc.) as opposed to directly observable physical constructs (e.g., height, weight, antibody levels, etc.)
What is a mental construct?
- Theoretical, intangible quality or trait.
- A psychological test aims to measure mental constructs (latent construct) by inferring an individual’s true score on the construct from their observed test score.
Aggressiveness
Emotional stability
Depression
Fear of vaccination
Intelligence
Beliefs in conspiracy
- Assumptions underlying psychometrics
- It is possible to measure psychological states and traits.
* Measurement – assigning values according to rules.
* Define the construct under study (“operationalization”)
* Sample from a universe of items thought to represent the construct.
* Developed rationally or empirically (good enough that its correlated) - Various methods of measuring aspects of the same thing can be useful.
* Format
* Multiple choice, true-false, essay, performance, verbal-nonverbal, behavioural observation, interview
* Administration
* Individual vs. group
* Timed
* Clinician administered versus self-report
* Scoring
* Cutoff vs. relative values (i.e., categorical versus dimensional) - Assessment can provide answers to some of life’s most momentous questions. Examples:
* Entry to UNSW?
* Competent to stand trial?
* Receive job or promotion?
* Many more…
* CAVEAT: Testing must be used appropriately by trained experts. - Error is part of the assessment process.
* Extraneous factors that influence test performance.
* Example:
* PSYC 2101 Final exam score = knowledge + noisy room
+ hungry + tired + drunk last night + COVID…. Etc.
True score + measurement error = observed score - Testing and assessment can be conducted in a fair and unbiased manner.
* Accommodations for test-takers with disabilities .
* Cultural Bias – very controversial with good reason. (Koori IQ test, 2003)
* If someone referred to you as “Binghi”, would it mean….
* a) you’re white
* b) like a brother
* c) you’re a baker
* d) you’ve got dough
* If you saw a gungibal, would you be looking at a….
* (a) soldier
* (b) policeman
* (c) centrelink officer
* (d) gunsmith
* The main point is to show non-Indigenous people two things: how the value of knowledge is culturally constructed; and what it is like to be assessed and graded on the basis of alien criteria.
(https://www.nesst.org.au/resource/koori-iq-test/)
what are the two types of measurement error?
Two types of measurement error
* Random error: unpredictable influences that vary from measurement to measurement. –> threats to reliability
* e.g. participant didn’t have their morning coffee or has the flu, examiner didn’t give clear instructions etc.
* Influences go in both directions —sometimes increasing a score and sometimes decreasing it
* Systematic error: biases that influence scores in a similar way across multiple measurements –> threats to validity
* e.g., using vocabulary as a measure of IQ in ESL participants
* Influences generally go in one direction —consistently increasing or decreasing a score
what is reliability?
Consistency of measurement
what is validity?
Accuracy of measurement