Lecture 3: Chapter 2: Current Approaches in Psychopathology Flashcards
What are the 4 types of influences that guide the study and treatment of psychopathology?
- Genetic
- Neuroscience
- Cognitive behavioral
- Socioemotional
What is epigenetics?
The study of how the environment can alter gene expression or function
What are 2 current insights of genetic research?
- Almost all behavior is heritable to some degree
- But genes don’t operate in isolation from the environment
How many chromosomes does a human have?
46, each consisting of many genes
What are genes?
Parts of a chromosome that carry DNA (genetic info)
What is gene expression?
Proteins turning genes on and off
What does it mean that psychopathology is polygenetic?
Genetic vulnerability is caused by the influence of multiple genes turning themselves on and off as they interact with a person’s environment
What is heritability? What are 2 important characteristics?
Statistical measure that refers to the extent to which variability in behavior in a population can be attributed to genetic influences
- Range from 0-1, high number is high heritability
- It’s relevant for large population, not individuals
What are 2 types of environmental factors that are important in genetic research?
- Shared environment: things common to family members, such as parenting practices or family income
- Non-shared environment: things that are unique to individual members of the family (friends etc.)
What is behavioral genetics?
The study that explores to what extent genes and environment contribute to certain behaviors
What is the difference between genotype and phenotype?
Genotype = physical sequence of DNA, total genetic make up of someone. It’s dynamic (gene expression)
Phenotype = observable behavioral characteristics. It changes over time and is the product of genotype-environment interaction
What is molecular genetics?
The study that seeks to identify genes and their functions
The main focus is identifying sequence and structure differences in genes
What are alleles?
Different forms of the same gene
What is genetic polymorphism?
Refers to a difference in DNA sequence on a gene that has occurred in a population
What is the function of RNA?
DNA in genes are transcribed to RNA. Then RNA can be translated into amino acids, which form proteins. These proteins can serve all kinds of functions, such as making cells
What is single nucleotide polymorphism (SNPS)?
Difference between people in a single nucleotide in the DNA sequence of a particular gene
They’re the most common types of polymorphism in the human genome
It has been studied in schizophrenia, autism and mood disorders
What are copy number variations (CNVs)? What are the 2 types?
Abnormal copy of one or more sections of DNA within the gene
- Addition
- Deletion
What are genome-wide association studies (GWAS)?
Study of SNPs (single nucleotide polymorphisms) and CNVs (copy number variations)
Computers isolate differences in genetic sequence between people who suffer from psychological disorders and people who do not
What is gene-environment interaction?
Genes can influence a person’s sensitivity to an environmental event
Genes can cause us to look for certain environments that increase the risk of developing a specific disorder
How can the genetic paradigm help us in psychopathology? What are 3 challenges that remain?
It helps us understand how genes are implicated in psychopathology
- How exactly the gene-environment interaction works
- Complex because several genes contribute to one disorder
- Most of genetic vulnerability increases rsik for psychopathology broadly more than for one specific disorder
SNPs tell us about the … of genes
CNVs tell us about the … of genes
SNPs: sequence
CNVs: structure
What are the 3 domains of neuroscientific research that are interesting for understanding influences in psychological disorders?
- Neurons and neurotransmitters
- Brain structure and function
- Neuroendocrine system
What are the 4 parts of a neuron?
- Cell body
- Dendrites
- Axons
- Terminal buttons at end of axon
What is a synapse?
Small gap between terminal endings of the sending axon and the cell membrane of the receiving neuron. This is the area neurotransmitters are sent from one to another
What are neurotransmitters?
Chemicals that allow neurons to send a signal across the synapse to another neuron
Which neurotransmitters may be involved in depression/mania/schizophrenia and which neurotransmitter in anxiety disorders?
Depression/mania/schizophrenia = dopamine and serotonin
Anxiety disorders = GABA
What are the 2 types of messages a neurotransmitter can send?
Inhibitory: makes postsynaptic cell less likely to create a new action potential
Excitatory: leads to creation of action potential in postsynaptic cell
What is meant with reuptake of neurotransmitters?
Neurotransmitters that aren’t received by post synaptic cell are either broken down in the synapse or there is reuptake from the pre-synaptic cell
What are gyri and sulci?
Gyri: ridges
Sulci: cavities
Describes structure of the brain
What is the difference between grey and white matter?
Grey: cell body material, form the outer covering of the brain
White: interior of the brain, where the large tracts of myelinated axons are
What are ventricles?
Cavities filled with cerebrospinal fluid deep in the brain. The fluid circulates through the brain through these ventricles which are connected to the spinal cord