Psyc2320

Midterm II Review

Physiological Depth Cues

– Accommodation

Physiological Depth Cues

– Convergence

crossed convergence uncrossed convergence

Large angle of convergence Small angle of convergence

HOROPTER

FIXATION POINT

Anything closer than the fixation point is in a crossed disparity

Binocular disparity

HOROPTERFIXATION POINT

Anything farther away than the fixation point is in an uncrossed disparity

Binocular disparity

RIGHT EYE LEFT EYE

If you uncross convergence, your right eye gets these faces shifted slightly to left, left eye gets them shifted to right = CROSSED DISPARITY

AutostereogramsAny repeating objects that have a spacing different from the background will have either crossed or uncrossed disparity

RIGHT EYE LEFT EYE

If you uncross convergence, right eye gets these faces shifted slightly to right, left eye gets them shifted to left = UNCROSSED DISPARITY

AutostereogramsAny repeating objects that have a spacing difference from the background will have either crossed or uncrossed disparity

Question 1

What is the difference between a stereogram and an autostereogram?

In a stereogram there is a plate in-between the viewers eyes, forcing him into uncrossed convergence

In an autostereogram there is no external aid to help the viewer in to uncrossed convergence; the viewer has to disconnect the accommodation/convergence reflexes

Question 2

What is parallax?

Points at different locations in the visual field move at different speeds depending on their distance from fixation

Question 3

Fill in:Crossed convergence shifts right eye’s image

slightly to the _______ and the left eye’s image slightly to the _______

LEFTRIGHT

Autostereograms

Left Eye’s Image

Right Eye’s Image

Crossed convergence shifts right image to the right of the left image and vice versa:

Autostereograms

Left Eye’s Image

Right Eye’s Image

Crossed convergence shifts right image to the right of the left image and vice versa:

Autostereograms

Left Eye’s Image

Right Eye’s Image

Crossed convergence shifts right image to the right of the left image and vice versa:

Question 3

Fill in:Crossed convergence shifts right eye’s image

slightly to the _______ and the left eye’s image slightly to the _______

Uncrossed convergence shifts right eye’s image to the ______ of the _____ eye and vice versa

LEFTRIGHT

LEFT LEFT

Autostereograms

Left Eye

Right Eye

Uncrossed convergence shifts right-eye’s image to the left of the left-eye image and vice versa:

Autostereograms

Left Eye

Right Eye

Uncrossed convergence shifts right-eye’s image to the left of the left-eye image and vice versa:

Autostereograms

Left Eye

Right Eye

Uncrossed convergence shifts right-eye’s image to the left of the left-eye image and vice versa:

Question 4 Which is correct?a) Head is accelerated in the direction of the blue arrowb) Head is accelerated in the direction of the red arrow

Cupula

Question 4 Which is correct?a) Head is accelerated in the direction of the blue arrowb) Head is accelerated in the direction of the red arrow

Cupula

Fluid goes this way

Head accelerates this way

Question 5

• Where on the tongue is the taste receptor for ‘bitter’ located?

Distributed evenly across the tongue surface with the exception of on the filiform region

Question 6

Which perception is associated with these physical properties of light?

IntensityFrequencyPolarization

BrightnessColorNot sensed by humans

Question 7What happens when we move the reference lap...

Question 7What happens when we move the reference lap...

....here???

Question 7

The viewer will perceive the light coming from the lamp as being moved further back in a 3D image

Question 8

What do you get if you use a prism to combine all wavelengths of light?

WHY?

What do you get if you mix a bunch of light?

WHY?

WHITEAll the wavelengths are added together. When they are all reflected at the same time, you see white

BLACK

The pigment in paint SUBTRACTS the different wavelengths – with enough pigments mixed, all the wavelengths are ‘absorbed’ and you see it as black

Question 9

How do we see color in a dim setting?

Question 9How do we see color in a dim setting?a) We perceive color not based on absolute wavelengths, but based on the wavelengths available to us

Question 9How do we see color under different illumination conditions?

b) COLOR CONSTANCY

The ‘color’ of objects is independent of the ambient light. The color of an object is perceived as the same under different lighting conditions to aid in object recognition and identification

Question 10

What is size constancy?

Perceived size of an object is adjusted according to perceived distance (based on other cues)