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Definition
measure of spatial configuration of different tissues
CT and MRI |
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| measures temporary change i brain; physiology associated with cognitive function |
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| xray absorbed in different tissue; computerized tomography |
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Definition
no radiation, spatial resolution, VBM; oxygen in blood
h2o align, radio freq spins, change in magnetic field |
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| segregating and measuring difference in white and gray matter concentration |
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| uses radioactive tracer; 0xygen-15 30 seconds after most useful |
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| deoxyhaemoglobin in blood |
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| blood oxygen level dependant contrast, relates to fMRI, signal measures change in BOLD over time |
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Definition
haemodynamic response function; changes in the bold signal over time
1. initial dip- neurons consume oxygen
2. overcompensation- blood flow increases above need
3. undershoot- both dip before returning to normal |
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Definition
| activity in control task subtracted from experimental task; problems with assuming specificity |
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| adding different components to a task doesnt change operations of other components |
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| effect of one variable on another |
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basically double subtraction
(A-B)-(C-D) |
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| measures associations between brain activity and changes in the variable of interest; not measuring difference in bran activity between conditions |
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| way different regions communicate with eachother |
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| stimuli belong together are grouped together; stimuli from a given condition are presented together |
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| stimuli from 2 or more conditions interspersed; separated for purposes of analysis |
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| stereotactic normalization |
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Definition
| mapping of individual brain differences to reference/template |
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| enhance signal:noise ratio by redistributing/smoothing |
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| location in brain standard to talairach atlas |
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| progressive loss of semantic info from semantic memory |
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| conceptually based knowledge about the world, including people, places, meaning of objects and words |
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| reduction/suppresion of the activity of a brain region, triggered by activity in another region |
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| an increase of activity of a brain region triggered by activity in another region |
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Definition
| an increase in phsiological processing in one condition relative to some other condition |
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Definition
| a decrease in physiological processing in one condition relative to some other condition |
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