Lecture 6 Flashcards

1
Q

3 reasons why we need eye movement

A

we need eye movement because

  1. the spatial resolution drops with increasing eccentricity
  2. best spatial resolution at fovea
  3. processing colour mainly at fovea
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2
Q

how many saccades do we make per second/day?

A

per second: 3-4

per day: 230 000

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3
Q

if we make so much eye movements, why is the world still stable?

A

during the saccades we cannot see

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4
Q

what is the difference between overt and covert attention?

A

overt attention: attention with eye movement

covert attention: attention without eye movement

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5
Q

what did Yarbus find in 1967?

A

Yarbus (1967)

> eye movements are depending on top-down knowledge (in this case, task instructions)

> this reflects enogenous (goal-driven) attention

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6
Q

what is exogenous attention

> with respect to eye movement?

A

exogenous: stimulus driven attention

> responsible for involuntary eye movements

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7
Q

how does goal-driven and stimulus- driven attention act when searching for a target under distractors?

A

> large effects of saliency for fast eye movement

> no effect of saliency on slow eye movement

> goal driven and stimulus driven selection act independently in different time windows

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8
Q

what relationship did daniel kahneman find with respect to pupil size and task difficulty?

A

pupil size increases in proportion to the difficulty of the task being performed

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9
Q

3 key facts on pupil size reactivity

A
  1. pupils constrict even when you only imagine a bright stimulus
  2. pupils react when you prepare eye movement to bright/dark area
  3. pupil size is good predictor of awareness (binocular rivalry)
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