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MODELING THE INTEGRATION OF SALAMANDER VISION AND
BEHAVIOR
by
Je rey Robert Begley
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Ful llment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(COMPUTER SCIENCE)
May 2009
Copyright 2009 Je rey Robert Begley
Object Description
| Title | Modeling the integration of salamander vision and behavior |
| Author | Begley, Jeffrey Robert |
| Author email | jbegley@usc.edu; jeff.begley@ngc.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Computer Science |
| School | Viterbi School of Engineering |
| Date defended/completed | 2009-02-17 |
| Date submitted | 2009 |
| Restricted until | Unrestricted |
| Date published | 2009-05-06 |
| Advisor (committee chair) | Arbib, Michael A. |
| Advisor (committee member) |
Itti, Laurent Mel, Bartlett W. |
| Abstract | This thesis examines the behavioral consequences of motion sensitivity of salamanders' visual neurons. The analysis is centered on a correlation-based motion detector model of motion-sensitive retinal ganglion cells (RGCs). This model is then integrated with Ijspeert's model (Ijspeert, 2001) of spinal central pattern generators (CPGs) for salamander walking and swimming. The integration in the salamander brain is studied by means of a model of a sensorimotor pathway centering on the tectum. Vision is used to control locomotion, while locomotion strongly affects vision.; Salamander undulatory locomotion may involve substantial side-to-side head movement. Chapter 2 explores the effect of the side-to-side movements on the activity of motion-sensitive RGCs. In chapter 3, we consider the effects on locomotion gaits. We hypothesize that visual control of the direction of salamander motion occurs when the side-to-side head movement changes direction, a time of relatively low background motion motion. I.e., we propose that visual control of locomotion is suppressed at times of high retinal slip. This hypothesis is supported by our simulation results and related analysis.; In chapter 4, we demonstrate how the model of chapter 3 can generate behavior that has been interpreted as numerical cognition. Our results support the hypothesis that the observed numerical preferences of salamanders are emergent properties of the early visual system, rather than evidence of higher cognitive ability. |
| Keyword | salmander vision; motion sensitivity; CPG-based locomotion; neural locomotion steering; numerical preference; numerical discrimination; brain modeling |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m2199 |
| Rights | Begley, Jeffrey Robert |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Begley-2784 |
| Archival file | uscthesesreloadpub_Volume14/etd-Begley-2784.pdf |
Description
| Title | Page 1 |
| Full text | MODELING THE INTEGRATION OF SALAMANDER VISION AND BEHAVIOR by Je rey Robert Begley A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Ful llment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (COMPUTER SCIENCE) May 2009 Copyright 2009 Je rey Robert Begley |
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