Eye Movements

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Why are saccades useful?
To determine what information is important to the brain at that time
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Which eye movement helps to process visual information?
Fixation
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In which situation would a mobile eye tracking system be easier?
Studying social behaviour
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What is the area of the retina where the photoreceptors are at their densest?
Fovea
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What is saccadic suppression?
Little visual processing occurs during saccades
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What determines the relevance of what our eyes have oriented to?
Stimulus properties and internal goals
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What is drift?
Change on the fovea where the image is forming
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What is a conjunctive movement?
Eyes move in the same direction
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What is a disjunctive movement?
Eyes move in different directions
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What is vergence?
Both eyes on a target which changes in depth
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What were the participants eye movements dependent on in Yarbus' research?
What instructions they were given
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What is the superior colliculus involved in?
Reflexive orienting towards sudden stimuli
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What do the receptive fields in the lateral layers of the superior colliculus respond to?
Visual stimuli at specific locations
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What do the intermediate layers of the superior colliculus contain?
Multisensory and motor neurons
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Electrical stimulation of neurons in the superior colliculus causes saccades with... (Wurtz et al.)
A particular movement field
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There can be activation in some neurons in the superior colliculus when... (Wurtz et al.)
Covertly attending to a stimulus
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What does the anti-saccade task study?
Cognitive inhibition, reflexive and voluntary saccades
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What is the aim of the anti-saccade task?
Look in the opposite direction of the target
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The longer the latency in the anti-saccade task, the more __________ _____________ occurs
Cognitive processing
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What percentage of errors to healthy controls make in the anti-saccade task?
10%
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People with schizophrenia had increased error rates in the anti-saccade task, which could be due to...
Underactivity in the frontal cortex, including the DLPFC
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In Gaymard et al. (1999), a patient with a lesion to the FEF had normal error rates in the anti-saccade task but increased time to make correct antisaccades. What does this suggest that the FEF is involved in?
Voluntary generation of saccades
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How is a patient with a lesion to the FEF likely to perform on the anti-saccade task?
Normal error rates but increased time to make correct antisaccades
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In Pierrot-Deseilligny et al. (2003), patients with damage to the DLPFC made more errors bilaterally in the anti-saccade task but with no difference in timings for correct antisaccades. What does this suggest that the DLPFC is involved in?
Inhibiting unwanted saccades
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How is a patient with damage to the DLPFC likely to perform in the anti-saccade task?
Increased errors but no difference in timings for correct antisaccades
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Other cards in this set

Card 2

Front

Which eye movement helps to process visual information?

Back

Fixation

Card 3

Front

In which situation would a mobile eye tracking system be easier?

Back

Preview of the front of card 3

Card 4

Front

What is the area of the retina where the photoreceptors are at their densest?

Back

Preview of the front of card 4

Card 5

Front

What is saccadic suppression?

Back

Preview of the front of card 5
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