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Behavioral and electrophysiological ...

Tuthill, John C.

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Behavioral and electrophysiological investigation of early visual processing in the fly.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Behavioral and electrophysiological investigation of early visual processing in the fly./
Author:	Tuthill, John C.
Description:	161 p.
Notes:	Source: Dissertation Abstracts International, Volume: 73-07(E), Section: B.
Contained By:	Dissertation Abstracts International73-07B(E).
Subject:	Neurosciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3499800
ISBN:	9781267248343

Behavioral and electrophysiological investigation of early visual processing in the fly.
Tuthill, John C.

Behavioral and electrophysiological investigation of early visual processing in the fly. - 161 p.

Source: Dissertation Abstracts International, Volume: 73-07(E), Section: B.

Thesis (Ph.D.)--The University of Chicago, 2012.

The visual system of the fly is a highly stereotyped network of neurons that transforms external luminance signals into electrical potentials that can be processed by the nervous system. I studied the neural computations that occur at the earlier stages of visual processing in the vinegar fly, Drosophila Melanogaster. Chapter 1 of this thesis is an historical introduction to the study of the most peripheral neuropil of the fly optic lobes: the lamina. In Chapter 2, I examine fly perception of the reverse-phi motion illusion by measuring steering responses of tethered flies in a virtual reality flight simulator. Flies perceive the reverse-phi illusion in much the same way as humans, and the activity of neurons in the visual system reflects this sensitivity. Behavioral responses to reverse-phi motion constrain the neural computations that underlie visual motion detection. In Chapter 3, I describe a novel class of wide-field feedback neurons in the fly lamina, and study the effects of silencing these neurons on visually-guided behavior. Silencing wide-field neurons impairs discrimination of low contrast visual stimuli, and increases sensitivity to low frequency motion patterns. Electrophysiological recordings from wide-field neurons in Chapter 4 demonstrate that these neurons are selective for low frequency luminance fluctuations, suggesting that wide-field feedback suppresses low frequency signals in the lamina. The frequency sensitivity of wide-field neurons shifts dramatically during flight due to release of the neuromodulator octopamine. Chapter 5 summarizes the main findings in this thesis, and provides a commentary on our current and future understanding of visual processing in the fly.

ISBN: 9781267248343Subjects--Topical Terms:

588700
Neurosciences.

Behavioral and electrophysiological investigation of early visual processing in the fly.
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245 1 0 $a Behavioral and electrophysiological investigation of early visual processing in the fly.
300 $a 161 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-07(E), Section: B.
500 $a Adviser: Michael Reiser.
502 $a Thesis (Ph.D.)--The University of Chicago, 2012.
520 $a The visual system of the fly is a highly stereotyped network of neurons that transforms external luminance signals into electrical potentials that can be processed by the nervous system. I studied the neural computations that occur at the earlier stages of visual processing in the vinegar fly, Drosophila Melanogaster. Chapter 1 of this thesis is an historical introduction to the study of the most peripheral neuropil of the fly optic lobes: the lamina. In Chapter 2, I examine fly perception of the reverse-phi motion illusion by measuring steering responses of tethered flies in a virtual reality flight simulator. Flies perceive the reverse-phi illusion in much the same way as humans, and the activity of neurons in the visual system reflects this sensitivity. Behavioral responses to reverse-phi motion constrain the neural computations that underlie visual motion detection. In Chapter 3, I describe a novel class of wide-field feedback neurons in the fly lamina, and study the effects of silencing these neurons on visually-guided behavior. Silencing wide-field neurons impairs discrimination of low contrast visual stimuli, and increases sensitivity to low frequency motion patterns. Electrophysiological recordings from wide-field neurons in Chapter 4 demonstrate that these neurons are selective for low frequency luminance fluctuations, suggesting that wide-field feedback suppresses low frequency signals in the lamina. The frequency sensitivity of wide-field neurons shifts dramatically during flight due to release of the neuromodulator octopamine. Chapter 5 summarizes the main findings in this thesis, and provides a commentary on our current and future understanding of visual processing in the fly.
590 $a School code: 0330.
650 4 $a Neurosciences. $3 588700
650 4 $a Behavioral sciences. $3 529833
650 4 $a Animal Physiology. $3 894174
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710 2 $a The University of Chicago. $b Biology. $3 3191672
773 0 $t Dissertation Abstracts International $g 73-07B(E).
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791 $a Ph.D.
792 $a 2012
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3499800