Flashcards
illusions
Cards in this deck (23)
- 1why do illusions occurwhat we see does not correspond to what we physically present in the world
-mismatch between what we see and what is actually there - 2there are two categories of illusionsillusions over time and illusions over space
- 3what are the forms of illusion over time-brightness after effect
-colour after effect
-negative colour after images - 4why do illusions over time occur -why does colour bleaching occursvisual system is uninterested in things that don't change
-photoreceptors and neurons get tired - 5why might we see colour a colour when there isn't one?colour is processed against one another
-after the intense green stimulus the white will stimulate the red cones more because the green cones are tired - 6-why does the motion after effect occur
- 7why does the motion after effect occur?-looking at static images: left and right movement preceptors firing equally
-looking at moving image to the left: intense firing of the leftward motion detector
after this motion has stopped the left detector is tired but the right is firing at a normal rate
-this leads to the perception that the right is firing at a greater rate and thus that an image is moving in that direction - 8waterfall/motion after effect explanationneuronal fatigue and opponent processing of motion direction
- 9what are the general perceptual principals if illusion that occur over time-get used to steady states and far more important to see the changes
-under representation of static values
-over emphasis of change in values across time - 10what is the brightness contrast-the grey bar and square are the same colour intensity at both ends despite appearing different at each
-this is because of the greater contrast with the surround
- 11what is colour contrastthe cross is coded depending on the background colour
-on the red appears more green
on the green it appears more orange
-emphasis of the complementary colour
- 12example of motion contrast-moving clouds could lead to the perception that the clouds are stationary and the moon is moving
- 13zollner illusion-lines appear to converge at first but are in fact parallel
this is because of the coding of orientation due to the bars
- 14what is different about illusions over space compared to illusions over time-do not require time to build up
-based on visual qualities that are coded for relative to the surround - 15what is the size distance relationship-the object that appear to be further away will be perceived as larger when they could be the same size in the context
- 16the ponzo illusionsuperimposed lines appear to be at two different lengths- in reality are the same length
- 17What is Gregory's theory?visual system make the hypothesis about the distance of objects based on the evidence in the images
-drawn from many visual cues - 18muller-layer illusion-distance between the two sets of points is perceived as different perceptually
-actually the same
- 19what is an Ames room-false distance cues
-left and right corners are not spatially equal- although appearing to be - 20what evidence is there to disprove gregorgys theory that perceptual cues are as a result of living in a carpentered environment-testing of people who do not live in developed areas- 3rd world no human contact
-doesnt have any effect
-there is still gravitational cues - 21what does the disproving of the Gregory theory proveillusion s do not occur because of environmental cues
- 22why can the brain not perceive incorrect 3d cues in images such as the Escher prints-brain doesn't compute all these structure at the same time
-looking at each part in isolation
- 23—
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- Flashcards on illusions , created by Samantha Bruce on 11/05/2018.
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- Samantha Bruce
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