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Exam 1. A week from Tuesday (Tue 16 Oct) 6-8pm in Chemistry ( not in Psych auditorium) Meredith’s sections in 1400 Chemistry Everyone else in 1800 Chemistry Will cover: Lectures 1-9 (up to and including this Thu) Textbook: Chapters 1, 2, 3, 4, and 7

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Exam 1
Exam 1

  • A week from Tuesday (Tue 16 Oct)

    • 6-8pm in Chemistry (not in Psych auditorium)

    • Meredith’s sections in 1400 Chemistry

    • Everyone else in 1800 Chemistry

  • Will cover:

    • Lectures 1-9 (up to and including this Thu)

    • Textbook: Chapters 1, 2, 3, 4, and 7

    • Articles: Kohler, Sacks, McCloskey, Kosslyn

  • Review sheet is posted on coursetools (look under Resources)


Observer perspective
Observer Perspective

  • Another distortion in visuospatial processing

  • People tend to subjectively stretch area around them and shrink other areas

  • Report distance from familiar place to unfamiliar place to be longer than reverse

  • E.g., Perspective from NYC



Lecture outline
Lecture Outline

Issues: (a) Perception vs. imagery (b) Depictive vs. propositional code (c) Compromise theory

1. Perception and imagery

1.1. Depictive and propositional codes

1.2. Imagery phenomena: scanning, zooming, transforming

2. Theory of mental imagery

2.1. Differences between imagery & perception

2.2. Compromise theory


Propositional vs depictive
Propositional vs. Depictive

  • Propositional

    • The globe is on the desk

    • ON (GLOBE, DESK)

  • Depictive


Propositional vs depictive1

has

white hair

George Washington

has

has

wooden teeth

thin lips

Propositional vs. Depictive

  • Issue: Is the representation that underlies imagery propositional or depictive?

    Propositional:

    Depictive:


Interference effects

Auditory Detection Visual Detection

Auditory imagery

Visual imagery

Interference

(None)

Interference

(None)

Interference effects

Perform two tasks simultaneously, if they interfere then they must require the same mental system.




Demand characteristics
Demand Characteristics?

  • Perhaps subjects think you want them to act like they’re scanning an image, so they act that way

    • Subjects infer the experimenter’s implicit demands

  • Or perhaps experimenters expect a certain set of results and this biases results

  • But get similar results when experimenters and subjects told that theory predicts scanning short distances takes longer


Image zooming
Image Zooming

Far Near






Mental rotation4
Mental Rotation

127°

90°

45°

Comparison



Imagery isn t just like perception
Imagery isn’t just like perception

  • Perception has metric qualities that images don’t

  • Example: Bisected rectangle with diagonal lines


Metric qualities of perception

1"

A

B1

1"

B2

Metric Qualities of Perception


Part whole relationships
Part-Whole Relationships

  • Quickly glance at this Star of David then look away


Part whole relationships1
Part-Whole Relationships

  • Using imagery: Did it contain a parallelogram?


Part whole relationships2
Part-Whole Relationships

  • Using perception: Does it contain a parallelogram?


Part whole relationships3
Part-Whole Relationships

  • Using perception: Does it contain a parallelogram?



Ambiguous figures
Ambiguous Figures

  • That figure was actually ambiguous

  • Using imagery: What else could that figure have been?


Ambiguous figures1
Ambiguous Figures

  • Using perception: What else could that figure be?


Compromise theory kosslyn

has

George Washington

white hair

has

has

wooden teeth

thin lips

Compromise Theory (Kosslyn)

1 - Basic code is propositional (for long term storage)

2 - Propositional code used to create depictive image

3 - Depictive image can be scanned, zoomed, etc.

generate

image


Visual imagery and cortex

Dorsal

Parietal Lobe

Dorsal

Visual Cortex

Temporal Lobe

Ventral

Visual Imagery and Cortex








Lecture outline1
Lecture Outline

Issues: (a) Perception vs. imagery (b) Depictive vs. propositional code (c) Compromise theory

1. Perception and imagery

1.1. Depictive and propositional codes

1.2. Imagery phenomena: scanning, zooming, transforming

2. Theory of mental imagery

2.1. Differences between imagery & perception

2.2. Compromise theory


Next time
Next Time

  • Working Memory

  • Read pp. 181-196 in the textbook

  • Read article by Baddeley


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