UNIVERSITY OF PHOENIX

KEVIN CONNELL

KRISTINA NELSON

COY STOKER

Visual Ambiguity Presentation

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Table of Contents

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IntroductionTemplate TheoryFeature-matching TheoriesObject-Centered TheoryConclusion

Introduction

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Template Theory

Viewer-Centered TheoryRecognition by comparing retinal images to

images on memory templatesWould require large number of templates in

memory

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http://cas.bellarmine.edu/tietjen/Ethology/birdbrain.gif

Feature-matching Theories

Uses parts of patterns such as horizontal, vertical, or slanted lines for recognition

Patterns or images are recognized by comparing their features with ones stored in memory

Features start out basic and become more and more complex until an image or pattern is recognized

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Object-Centered Theories Biederman’s Geon Theory What is a geon? Properties of geons.

1.View Invariance 2.Stability to visual noise 3.Discriminability

Cognition

Object-Centered Theory

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http://www.psych.utah.edu/psych3120-classroom/geon.gif

Conclusion

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Conclusion•Introductory pictures•Viewer or object centered theories•Concluding pictures•Solution

References

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Moshe, B. (2003) A cortical mechanism for triggering top-down facilitation in visual object recognition. Journal of Cognitive

Neuroscience, 15(4), 600-609. Retrieved August 2, 2009, from EBSCOHost Database.

Visual perception. (n.d.) Psychology: An International Perspective. Retrieved August 3, 2009, from Psypress Web site:

http://www.psypress.com/pip/resources/slp/topic.asp?chapter=ch07&topic=ch07-sc-08

Willingham, D. T. (2007). Cognition: The thinking animal. New York, NY: Pearson Prentice Hall.