issues in menta health Flashcards
what is a neurotransmitter?
chemical messengers that allow neurones to communicate with one another at the synapse
what is a neuron?
nerve cells that transmit nerve signals to and from the brain at up to 200mph
what are the components of a neuron?
dendrite
nucleus
myelin sheaf
axon
receptors
what is the enzyme that hydrolyses neurotransmitters?
monoamine oxidase
what is the biochemical explanation?
there is an imbalance of neurotransmitters within the brain
what did Lazenberger et al research?
the binding potential of serotonin in social phobia
what did Lazenberger et al find?
lower binding potential of serotonin receptors in social phobics than the control group
particularly in the amygdala
describe the dopamine hypothesis
high levels of dopamine in the Parietal Lobe - which is associated with sensory information - if too high patients experience hallucinations
low levels of dopamine in the Pre-Frontal Cortex - which is the control centre of the brain - if too low patients experience lack of concentration and attention
three good things about the biochemical explanation
useful -> drug production
evidence -> Lazenberger
reliability -> standardised and easy to test
three bad things about the biochemical explanation
ethical implications -> people may be distressed because they can’t control it on their own
might be the MI that causes the imbalance
reductionist -> doesn’t take nurture into account
what is the genetic explanation?
individuals inherit a gene(s) which makes them have a predisposition to MI
how could we study the genetic explanation?
compare concordance rates of MI with mono and dizygotic twins
define concordance
chance of an individual having a certain trait if another does
three good things about the genetic explanation
quantitive -> easy to establish MH trends
useful -> genetic counselling
holistic -> says environment triggers gene(s)
three bad things about the genetic explanation
ethical implications -> may cause distress as people cannot change their DNA
quantitive -> removes depth of experiences
socially sensitive
what biochemical causes anxiety?
serotonin (low)
what biochemicals cause depression?
dopamine (low)
serotonin (low)
norepinephrine (low)
what biochemical causes schizophrenia?
dopamine (high and low)