M1: Chapter 2 Flashcards
(118 cards)
What is a paradigm?
A set of basic assumptions that outlines the universe of scientific inquiry, specifying both the concepts regarded as legitimate and the methods to be used in collecting and interpreting data.
Provides general perspective that defines how to conceptualize and study a subject.
Developed by Thomas Kuhn.
What are the four types of paradigms in abnormal psychology?
- Biological
- Behavioural
- Psychoanalytic
- Humanistic
Define the Biological Paradigm.
A broad theoretical view that holds that mental disorders are caused by some aberrant somatic process or defect.
(a continuation of the somatogenic hypothesis!)
EXAMPLE: removal of ovarian cysts or the entire ovaries was thought to be treatment for melancholia, mania, and delusions.
Also referred to as the medical model or disease model.
What is the dominant paradigm from the late 1800s to the middle of the 1900s?
Biological Paradigm.
Based on the belief that in all medical illnesses, there is some biological process disrupted or not functioning normally.
What does behaviour genetics study?
Individual differences in behaviour that are attributable to differences in genetic makeup.
What are genes?
ultramicroscopic area of the chromosome and the smallest physical unit of the DNA molecule that carries a piece of hereditary information.
What is a genotype?
An individual’s unobservable, genetic constitution.
What is a phenotype?
The totality of observable characteristics of a person.
Phenotype changes over time!
(thought to be the product of the interaction between the genotype and the environment)
Example: Level of anxiety or intelligence
Various clinical syndromes are disorders of the ——–, not the ———.
phenotype
NOT the genotype
AT MOST, the genotypes for the disorders can be inherited and the environment is responsible for the disorder occuring or not!
What are the four basic methods to determine if psychopathology is inherited?
- Family Method
- Twin Method
- Adoptees Method
- Linkage Analysis
What is the Family Method in behaviour genetics?
A research strategy where the frequency of a trait or abnormal behaviour is determined in relatives with varying percentages of shared genetic background.
Idea is that if a mental disorder can be inherited, studying the family should reveal a relationship between # or shared genes and the prevelence of disorders.
What is the first step in the family method within behaviour genetics?
To collect index cases or probands
(people in the genetic investigation that bears the diagnosis or trait in which the investigator is interested!)
If genetic predisposition is present, index cases should…
have the disorde at a higher rate than found in the general population.
What does the Twin Method compare?
Concordance rates of monozygotic (identical) and dizygotic (fraternal) twins.
Studies begin with diagnoses cases and then search for the presence of the disorder in the other twin.
Concordance = the similarity in psychiatric diagnosis or in other traits within a pair of twins.
True or False: If the MZ concordance rate is higher than the DZ rate, the characteristic being studied is said to be heritable.
True!
This is because MZ twins (identical) have the same genes, meaning there is strong heritibility.
Why is data from the twin method hard to interpret?
Because concordence could be due to childhood environment or other factors.
Ex. The greater number of children with a panic disorder could reflect child-rearing practices of panic disorder parents (where a genetic predisposition is not actually involved).
What is the Equal Environment Assumption?
Assumes that environmental factors are partial causes of concordance and equally influential for MZ pairs and DZ pairs.
Saying that MZ and DZ pairs have equivalent numbers of stressful life experiences.
What is the Adoptees Method?
Children who were adopted and reared apart from their biological parents (eliminating the influence of being raised by disordered parents).
Ex. if children with a high frequency of panic disorder that were reared apart from biological parents with a panic disorder → can act as evidence for genetic predisposition of disorder!
Define Linkage Analysis.
A technique in genetic research where the occurrence of a disorder in a family is evaluated alongside a known genetic marker (used to study families where disorder is heavily concentrated).
*a method within molecular genetics (approach that tries to specificy the particular genes involved in a disorder)
What is an allele?
Any one of several DNA codings that occupy the same position or location on a chromosome.
What is genetic polymorphism?
Variability in genes that occurs among members of a species.
How does linkage analysis work?
Works by using another characteristic whose genetics are known (genetic marker).
If psychopathology among relatives aligns with the occurrence of the genetic marker → it is concluded that the gene predisposing people to psychopathology is on the SAME chromosome and in a SIMILAR LOCATION on that chromosome (“is linked”) as the gene controlling the genetic marker.
Researchers often use the area of linkage analysis to hypothesis gene-environment interactions, which are…
The idea that a disorder or related symptoms are the COMBINED product of a genetic vulnerability and specific environmental experiences/conditions.
What is temperament?
An individual difference variable that reflects variability in tendencies such as emotionality and activity level.
(like reactivity and self-regulation)
Partly beleived to result from biological inherited differences.
Shows that individual temperment differences is largely genetically predetermined and detectable at birth.