Perception Unit slides

1. Perception

2. Partner #2 closes eyes and pinches nose
Partner #1 gives one jelly bean of Flavor A
Halfway through chewing Flavor A, #2
unpinches nose and tries to guess flavor.
Repeat for remaining three jelly beans.
Switch partners

3. Perception
Perception
The process of organizing
and interpreting sensory
information.
Selective Attention
The focusing of conscious
awareness on a particular
stimulus.

4. Perception
Perception
The process of organizing
and interpreting sensory
information.
Selective Attention
The focusing of conscious
awareness on a particular
stimulus.

5. Selective Attention

6. Selective Attention

7. Selective Attention

8. Selective Attention

9. Selective Attention

10. Perceptual Illusions
Text
Franz Muller-Lyer Illusion.
Which segment is longer? AB or BC?

11. Perceptual Illusions
Text
Franz Muller-Lyer Illusion.
Which segment is longer? AB or BC?
AB is one-third longer than BC.

12. Perceptual Illusions
Size-Distance
Relationship
Illusions help us
understand perception.

13. Size-Distance Relationship

17. Perceptual Organization
Visual Capture
Tendency for vision to dominate the other senses.
Grouping
The perceptual tendency to organize stimuli into
coherent groups.
Gestalt
Tendency to integrate pieces of information into a
meaningful whole.

18. Form Perception:
Figure and Ground
The organization of
the visual field into
objects (the figure)
that stand out from
their surroundings (the
ground).

19. Form Perception:
Grouping

20. Depth Perception
Depth Perception
The ability to see objects in three dimensions.
Allows us to judge distances.
Sources of Depth Perception
Binocular Cues
Monocular Cues

23. Depth Perception:
Binocular Cues
Retinal Disparity
Images from two eyes differ.
The closer the object, the
greater the difference.
Eg MagicEye
Convergence
The extent to which the eyes
converge when looking at an
object.

27. Depth Perception:
Monocular Cues
Interposition - Closer Relative Height –
object blocks distant Objects higher in our
object. vision seem farther.
Relative Size - Smaller Relative Motion – The
image is more distant. nearer an object, the faster
it moves.
Relative Clarity - Hazy
Linear Perspective –
object seen as more
Parallel lines seem to
distant.
converge at the horizon.
Texture Gradient -
Light and Shadow –
Coarse = close and Fine =
Further objects seem more
distant.
dim.

28. Motion Perception
As an object moves
across our field of
vision, it is detected by
opposing visual
cortices.
Phi Phenomenon –
marquees.
Stroboscopic
Movement – 24 frames
per second.

35. Perceptual Constancy
Perceiving objects as
unchanging despite
changes in retinal image.
Color
Shape
Size

36. Perceptual Constancy
Size-Distance Relationship
Linear Perspective uses context cues to tell
distance based on relative size.

37. Perceptual Constancy
Lightness Constancy
Relative luminance: the
amount of light an object
reflects relative to its
surroundings.

38. Perceptual Interpretation
Sensory Deprivation.
There is a critical period
for developing feature
detector cells.
If deprived of a stimuli
over a long period of
time, the brain loses the
original ability to process
that stimuli.
Eg Blakemore and Cooper,
1970.

39. Perceptual Interpretation
Perceptual Adaptation
The visual ability to
adjust to an artificially
displaced visual field.
E.g. Prism glasses.

40. Perceptual Interpretation
Perceptual Set
A mental predisposition to
perceive one thing and not
another.
Context Effects
Context affects perception.

41. Extrasensory Perception
Telepathy
ESP
Mind-to-mind
The controversial claim that
communication.
perception can occur apart
from sensory input.
Clairvoyance
A reproducible ESP Perceiving remote events.
phenomenon has never been
Precognition
discovered, nor has anyone
produced any individual who
Perceiving future events.
can convincingly
demonstrate psychic ability.