Cerebral bloodflow

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What can be used to measure neural activity in brain?
Electrodes
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Why can't these be used in humans?
They are invasive
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What did Hubel and Wiesel find in cats?
That neurons in visual cortex responded to lines of different direction and orientation
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However what does the invasive procedure mean we can't find out?
About complex skills e.g. playing an instrument
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If we could use electrodes in the brain, what would be the drawback?
We would only get a small sample of neurons
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What does PET stand for?
Positron Emission Tomography
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What is injected into brain?
Radioactive tracers
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What stays in brain that can detect flow?
Radioactive water (butanol)
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What does a circular scintillation detector do?
Detects radiation
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What did Raichle et al activate in their PET studies?
Visual cortex
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What is the strength of PET studies?
Gives absolute measurements
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what are the weaknesses?
Cannot use same participant multiple times due to radioactivity, poor temporal and spatial resolution and stimuli have to be applied for a long amount of time - not useful for most psych. studies
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What does EEG stand for?
Electroencephalogram
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What does EEG involve?
Electrodes on scalp
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What does it measure?
Voltage changes from synaptic activity
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What can it reveal changes in for different stimuli?
Processing speed
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What is the advantage?
Good temporal resolution
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What are the disadvantages?
Difficult to interpret and poor spatial resolution because brain waves are chaotic and spread out
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Other cards in this set

Card 2

Front

Why can't these be used in humans?

Back

They are invasive

Card 3

Front

What did Hubel and Wiesel find in cats?

Back

Preview of the front of card 3

Card 4

Front

However what does the invasive procedure mean we can't find out?

Back

Preview of the front of card 4

Card 5

Front

If we could use electrodes in the brain, what would be the drawback?

Back

Preview of the front of card 5
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