brain scanning technology bloa. how do we know what’s going on inside the brain?
TRANSCRIPT
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Brain Scanning Technology
BLOA
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How do we know what’s going on inside the brain?
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What do these techniques involve?
Ablation
Lesioning
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Ablation – removing part of the brain
Lesion – scarring or damage (either intentionally as part of an operation, or due to accidental brain damage
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Fat RatsFat Rats
How do we know when to stop eating?
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Hetherington and Hetherington and Ranson (1942)Ranson (1942)
Hetherington and Ranson (1942)
Experimented using rats
Lesioned the ventromedial hypothalamus
Rats ate far more than usual
Researchers believed this proved that the hypothalamus stops us from eating too much.
More recent research suggests that we still do not fully understand the role of the hypothalamus (though it is involved in the regulation of hunger)
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What alternatives do we have now to lesioning and ablation?
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One technique is the EEG
Show Brain Story
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Electroencephalogram Electroencephalogram (EEG)(EEG)
EEG
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EEGEEG
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EEGEEG Watch
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EEGEEG
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EEGEEG
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PETPET A PET scan monitors glucose metabolism in the brain
Patient given radioactive glucose
PET detects radioactive particles
Produces coloured maps of brain activity
Can detect abnormalities like tumours
Used in Alzheimers research
Can compare differences in normal and abnormal brains
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Positron Emission Positron Emission Topography (PET)Topography (PET)
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PETPET
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PETPET
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PETPET Gur et al (1995)
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functional magnetic functional magnetic resonance imaging resonance imaging
(fMRI)(fMRI) fMRI uses magnetic fields and radiowaves
Shows actual brain activity
Higher resolution than PET
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fMRIfMRI