Deck 12: Visual Motion Perception

Question 1

By itself, image motion cannot be used to:

A) Distinguish object motion from self-motion
B) Visually guide action
C) Segregate figure from ground
D) Extract three-dimensional structure

Answer 1

A

Question 2

The term 'kinetic depth' is used to refer to perception of:

A) Dynamic stereo
B) Motion parallax
C) 3-D structure from motion
D) Optic flow

Answer 2

C

Question 3

Research favours a model for kinetic depth based on:

A) Attention
B) Velocity
C) Position
D) Stereo

Answer 3

B

Question 4

Processing of biological motion involves:

A) The magno stream
B) The dorsal stream
C) The ventral stream
D) Both dorsal and ventral streams

Question 5

Saccadic suppression plays a role in:

A) Keeping the eyes stationary
B) Blocking vision during eye motion
C) Detecting motion
D) Integrating information from motion and orientation

Question 6

Who was the first to causality perception in motion displays:

A) Reichardt
B) Heider & Simmel
C) Johansson
D) Michotte

Question 7

Direction discrimination in RDKs is reliable only for displacements below:

A) 2.5 deg
B) 1.0 deg
C) 0.25 deg
D) 0.01 deg

Question 8

Paralysis of the extra-ocular muscles:

A) Has no effect on motion perception
B) Abolishes the perception of all motion
C) Causes motion perception to occur all the time
D) Causes motion perception when eye movements are attempted

Question 9

A moving texture-defined region against a texture background would be invisible to:

A) All motion detecting systems
B) All neural motion sensors
C) First-order motion sensors
D) Second-order motion sensors

Question 10

Feature tracking has been proposed to explain motion perception in which kind of stimulus:

A) RDK
B) Optic flow
C) Biological motion
D) Plaid

Question 11

According to the velocity-space model, the aperture problem is solved in cortical area:

A) V1
B) MST
C) MT
D) V4

Question 12

At a minimum an elementary motion detector requires inputs from:

A) One input receptive field
B) Two input receptive fields
C) Three input receptive fields
D) Four input receptive fields

Question 13

Neural motion detectors vary with stimulus:

A) Speed and direction
B) Direction but not speed
C) Speed but not direction
D) Neither speed nor direction

Question 14

An erroneous motion signal in motion detectors at extreme velocities is known as:

A) The aperture problem
B) Motion streak
C) Velocity tuning
D) Aliasing

Question 15

Which statement about the motion after-effect (MAE) is false?

A) It has been known since antiquity
B) It shows inter-ocular transfer
C) It can be explained by adaptation in direction-selective neurons
D) It cannot be seen in static patterns

Question 16

Direction specific threshold elevation is due to:

A) Saccadic suppression
B) Motion adaptation
C) The aperture problem
D) Aliasing

Question 17

Which is not true? Watching a pattern of horizontal bars move upwards, for one minute with one eye closed:

A) Will raise the contrast threshold for downward moving bars
B) Will cause apparent downward motion in a stationary bar pattern
C) Will have effects that transfer to the other eye
D) Will alter the apparent speed of vertical motion

Question 18

In RDK experiments reliable direction discrimination is most reliable at inter-stimulus intervals below

A) 10 ms
B) 100 ms
C) 500 ms
D) 1000 ms

Question 19

Plaid stimuli contain:

A) Random arrays of dots
B) Disconnected points of light
C) A pair of gratings
D) Motion streaks

Question 20

Local motion detector responses to a rigidly moving shape:

A) All correspond to the direction and speed of the shape regardless of local orientation
B) Vary in direction according to local contour orientation
C) Vary in direction and speed according to local contour orientation
D) Vary in speed according to local contour orientation