Behavioural Approaches To Neuroscience 2 Flashcards Preview

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Flashcards in Behavioural Approaches To Neuroscience 2 Deck (7)
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MRI

Takes sections through brain
Magnetic field aligns H atoms, radio waves cause them to spin producing a signal
Voxel based morphemetry-> used to calculate the size of an area
Diffusion MRI-> diffusion of water molecules-> movement restricted once in a nerve-> map white matter tracts
Measure cortisol thickness -> thinner in Tourette's

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Neural imaging- structural measures

Skull XR
Cerebral angiography
Computed tomography
Magnetic resonance imaging
Pneumoencephalography

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Neuroimaging functional measures

Positron emission tomography
Functional MRI
Single proton emission tomography

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fMRI

Measures brain activity in the living brain
Measures change in cerebral blood flow during cognitive tasks-> increased doxyhaemaglobin in active areas
BOLD-> blood oxygenation level dependent effect-> haemodynamic response is slow so remains for 12-15 secs after activity stops
-> only an indirect measure, many areas involved in one task! effected by noise
-> reduced response in Tourette's

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Neural recording methods

Single cell recording
Electroencephalogram
Event related potentials
Magnetoencephalograpy

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Electroencephalogram

Measures brain activity in living brain
Provides continuous recording of overall brain activity from scalp electrodes
Populations of post synaptic neurones measured
-> sleep, depth of anaesthesia, epilepsy and brain damage, normal brain
EEG profiles change depending on brain state

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Event related potentials

Evoked electrical activity specifically related to sensory, motor or cognitive events
Average of each one second phase on EEG is ERP
Coarse resolution
Relies on modelling of source dipoles