Psyc2320 Midterm II Review

Physiological Depth Cues – Accommodation

Physiological Depth Cues – Convergence

crossed convergence uncrossed convergence Large angle of convergenceSmall angle of convergence

HOROPTER FIXATION POINT Anything closer than the fixation point is in a crossed disparity Binocular disparity

HOROPTER FIXATION POINT Anything farther away than the fixation point is in an uncrossed disparity Binocular disparity

RIGHT EYELEFT EYE If you uncross convergence, your right eye gets these faces shifted slightly to left, left eye gets them shifted to right = CROSSED DISPARITY Autostereograms Any repeating objects that have a spacing different from the background will have either crossed or uncrossed disparity

RIGHT EYELEFT EYE If you uncross convergence, right eye gets these faces shifted slightly to right, left eye gets them shifted to left = UNCROSSED DISPARITY Autostereograms Any 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 _______ LEFT RIGHT

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 LEFT RIGHT 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 arrow b)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 arrow b)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? Intensity Frequency Polarization Brightness Color Not sensed by humans

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

Question 7 What 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? WHITE All 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 9 How 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 9 How 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)