L3 - Flashcards in IGCSE French

Created by: 10dhall
Created on: 21-05-19 21:17

Limitations of FMRI?

activation not sufficient- change must be told as brain is always active- subtraction methodology. HRF response takes between 10-20 seconds.

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Corbett- 2000

attending to a central endogenous cue showed activation in FPC. shows active brain processes showing active top-down processing of stimuli.

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Wojcuilik and Kanwisher - 1999

3 tasks: spatial selection, object/space based+ feature conjunction. all have different difficulties- showed a common activation suggesting top-down involved in all diff. also found increase in PC with difficulty. easy visual showed more PC than

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continue

hard language task so PC not based on attention - parietal cortex

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What brain region is involved in top-down?

Dorsal fronto-parietal

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Bottom up?

Ventral fronto-parietal

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describe functional localisers?

Limit research to a ROI - localise area using MRI then analyse function using BOLD.

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Kastner - 1999 - ROI and visual cortex - key

given periods of stimuli followed by periods of expectancy- found increase in area v4 when expecting- indicating position before appeared. shows top down processing before stimuli.

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What is global and local?

global- entire object, local- part within global

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Mevorach - 2009 - key

evaluated salience in response to local and global letters. extract local or spot global. Left IPS is active when salience needs to be suppressed. LIPS- responsible for salience suppression-

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Mevorach - 2010-

Applied TMS over right+left IPS. Right TMS- disrupted salience recognition. Left TMS- disrupted suppression of salience - suggests PPC is lateralised- need balance within IPS.

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Other cards in this set

Card 2

Front

Corbett- 2000

Back

attending to a central endogenous cue showed activation in FPC. shows active brain processes showing active top-down processing of stimuli.

Card 3

Front

Wojcuilik and Kanwisher - 1999

Back

Card 4

Front

continue

Back

Card 5

Front

What brain region is involved in top-down?

Back

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