brain scans Flashcards
(38 cards)
how are neurostimulation tools safe and non-invasive
because we use a metal rod that hovers over the scalp rather them piercing the skin
how does a TMS or tDCS work
they manipulate the amount of firing neurons in a section of the brain to see the impact it has as they can decrease or increase the excitability
what is the procedure of a TMS & tTDCS
a electronic field coil is moved around the head to manipulate electrical currents in the brain
what are the problems with single cell recording
its invasive, can only be done on animals, not sure if findings would apply to humans
what are the problems with lesion
people are affected differently - hard to identify a brain region, case studies don’t represent all of population
what are the contributions of the neuroimaging techniques
it allows us to view the structure and processes of the brain, allows us to study animal brains which is important fort he development of biological and psychological sciences that one based on animal models
what is the definition for psychological process
it is the changes in electrical supply and changes in blood supply
what re MRI & EEG’s used for
neuroimaging/mapping
what kind of relationships does TMS and tDCS measure
casual relationships
what re sMRI’s
static MRI’s
what are fMRI’s
functional MRI’s
how much radiation does an MRI radiate
0
what do MRI’s rely on to collect data from brain scans
they rely on correlation between neural activity and cognitive processes to they cant infer causal relationships
what is the magnetic field measured in for MRI’s
tesla
what are the typical intensities of MRI scanners
1.5T, 3T and 7T
what are hemodynamic changes
blood flow changes
what specifically in blood does an MRI measure
the amount of oxygen carried
do MRI’s directly or indirectly measure brain activity
indirectly, it assumes that firing neurons need more oxygen
do MRI’s have good spatial or temporal resolution
spatial
do sMRI’s or fMRI’s have a better picture resolution
sMRI’s
how long does it take to do a sMRI
8 minutes
what do EEG’s measure
significant voltage fluctuations from neuronal activity
do EEG’s have a better spatial or temporal resolution
temporal
are EEG’s based on correlation
yes
