Midterm Flashcards

1
Q

Why does the sculpture in this video (photos below) look like a picture of an eye on a flat surface (bottom photo), even though it’s a 3D array of black balls hanging from the ceiling?

A

Bet on the familiar/non-accidental

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2
Q

An observer sitting in a camera obscura sees an image and notices there is very little, if any, color. The most direct and likely explanation for this particular observation is:

A

It’s a scotopic situation.

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3
Q

Staring at some blurry colored dots, you notice they disappear. This is because of _______ and is an example of the principle of ______ Then, when you move your eyes, the colors are _______.

A
  1. 3.
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4
Q

psychophysics

A

relate a physical stimulus with a psychological state

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5
Q

autocalibration

A

eye calibrates to environment

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6
Q

Name two examples of autocalibration

A
  • vision from night to day
  • motion auto-calibration
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7
Q

measure then model

A

spare information can give rise to strong percepts

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8
Q

Name an example of measure then model & replace ambiguity with certainty

A

a bunch of dots can appear like a person walking

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9
Q

replace ambiguity with certainty

A

strong percepts exist because when given ambiguous information, the brain goes with the familiar

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10
Q

Name an example of bet on the familiar or non-accidental

A

3D perception of 2D pictures

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11
Q

Many different 3D objects have same 2D silhouette, how can we interpret?

A

Measure, try to model, solve ambiguity, select most common

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12
Q

Name an example of most common interpretation

A

when looking at a cube, you can perceive vertex as close or far from you

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13
Q

Where does sunlight fall on the electromagnetic spectrum?

A

between UV rays and infrared rays

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14
Q

How does light travel?

A

in a straight line as an electromagnetic wave

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15
Q

Why can we see objects?

A

light reflects in every direction from each point of an object

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16
Q

Name the 4 ways to recover a light pattern

A
  1. tubes
  2. pinhole
  3. mirror
  4. lens
17
Q

tubes

A

imagine group of straws → light can go down tubes but cannot cross; one ray of light = one tube

18
Q

pinhole camera

A

small pinhole allows for one direction of light per point

19
Q

What is a limitation of pinhole cameras?

A

not enough light

20
Q

lenses

A

light bends when crossing boundary between two materials, refraction proportional to ratio of speeds (think of sand trap example!)

21
Q

What do converging prisms do?

A

sum light from all the rays

22
Q

Explain focal point in lenses

A
  • Distance from focal point is f
  • Measured in diopters = 1/f
23
Q

A powerful lens has a large or small f?

A

small

24
Q

How does water affect f?

A
  • lengthens it
  • weaker f
25
Q

Mirrors

A

reconstruct images

26
Q
A