os II Flashcards
What do the 6 cell layers of the cerebral cortex do with incomming information?
Form meaningful spatiotemporal patterns, then send it to other areas
What areas are the spatiotemporal patterns sent to?
limbic system, brain stem, spinal cord, cortical areas
What input does stallate cells in the layer IV receive?
sensory info from the thalamus
Pyramidal cells in the 5 layer do what?
project info to other regions of the CNS
what generates excitatory and inhibitory patterns of neural activity in the cerebral cortex?
interneurons and their intricately formed circuts do.
What are brodmanns areas of the cortex?
They are areas with histologically distinguishable cells, different from the areas around them.
What are used as anatomical identification of functional areas of the cortex?
brodmanns areas.
What does functional magnetic resonance imagind show?
visualize brain activity in response to stimulus
in the fMRI what do the green, red and yellow represent.
Green - remembered visual, Red- rememberd audio, Yellow remembered both
What do scanning hydrogen ions provide?
overall map of the brain, using magnetic gradients.
what divides brain in MRI into slices?
magnetic gradients
What do the pixels repersent??
concentrations of ubiquitous H+ ions
What is BOLD?
blood oxygen level detection, used to measure neurally related blood flow.
what happens to blood flow with increased neural activity?
increased oxygen demand and blood flow
How does blood show oxygenation?
different matgnetic properties when blood is oxygenated (dimagnetic) and not oxygenated (paramagnetic) so it looks different in MRI
So, what can MRI used specifically to detect brain activity?
Blood oxygenation level because it varies with brain activity
where is thalamus and what does it look like?
pair of oval clusters of nuclei on each side of the third ventricle in the diencephalon.
Where does thalamus project axons?
to ALL areas of cortex.
Where does each nucleus in the thalamus project axons?
Nuelei project axons to cerebral cortex
what info does thalamus send to cerebral cortex?
sensory, motor, or integrated neural information
where does the VPL/VPM project information to?
Primary somatosensory cortex cortex
