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Page 1: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Perception 2

Page 2: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Figure 2-19

An example of context effects in perception.

Top-Down Processes

Page 3: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

The same physical stimulus can be interpreted differently depending on perceptual set, e.g., context effects.

When is the middle character the letter B and when is it the number 13?

Perceptual Set Context Effects

Page 4: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Top-Down Processes

Perceptual Learning

Page 5: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Top-Down Processes

Change Blindness

http://viscog.beckman.uiuc.edu/grafs/demos/10.html

Page 6: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Word Superiority Effect

Top-Down Processes

K

OWRK

WORK

K D

Page 7: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Bottom-Up and Top-Down Processing working together

Word Perception Connectionist Model

Features(lines)

Letters

Words

I

B

Bat

_at

Flying Animal

Page 8: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Figure 2-24 (p. 73)Example of stimuli used in the PET scan study of processing words. See text for explanation.

Word Perception Neuropsychological Perspective

Page 9: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Direct Perception vs. Constructivist Approach

Biological motion http://www.psico.univ.trieste.it/labs/acn-lab

/eng_p/e051c1m1_curr.html

Page 10: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Optic flow

Page 11: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Affordances: Information from the stimulus that specifies

how it can be used

Direct Perception

Page 12: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

(Ventral)

(Dorsal)

Page 13: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Visual Agnosia

http://scien.stanford.edu/class/psych221/projects/06/cukur/intro_files/image021.jpg

Page 14: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Visual Agnosia

Associative Visual Agnosia Can copy, but unaware what it

is; cannot assign meaning to object

Difficulty in transferring visual info into words

Apperceptive Visual Agnosia Cannot recognize by shape Cannot copy drawings Often involves ‘prosopagnosia’

http://scien.stanford.edu/class/psych221/projects/06/cukur/intro_files/image021.jpg

Page 15: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Agnosia

Page 16: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Identification of Faces and Members of Categories

Prosopagnosia

The Fusiform Face Area:

http://www.psy.vanderbilt.edu/faculty/gauthier/picts/mona_lisa.jpg

Page 17: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes
Page 18: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes
Page 19: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Thatcher illusion

http://www.face-rec.org/interesting-papers/Other/SchCarLed2003.pdf

Page 20: Perception 2. Figure 2-19 An example of context effects in perception. Top-Down Processes

Subliminal Perception

Can subliminal messages change our behaviors?


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