자료유형  

 학위논문

Control Number  

0017163363

International Standard Book Number  

9798384480440

Dewey Decimal Classification Number  

152

Main Entry-Personal Name  

Christman, Katie Anna.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of California, San Diego., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

131 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

General Note  

Advisor: Gentner, Timothy.

Dissertation Note  

Thesis (Ph.D.)--University of California, San Diego, 2024.

Summary, Etc.  

요약Dolphins use an advanced biosonar system to accurately navigate and forage in their environment. They have the unique capability to rapidly detect and classify underwater targets in a complex acoustic environment and do so more precisely than man-made underwater sonars. Dolphins use the fine-scale temporal and spectral features of the echo-waveforms to determine different attributes of the target and rely on echo-delay, the time between their emitted sound pulse "click" and the return of the reflected echo to determine the range to a target. In this dissertation, phantom echoes are used to determine the effect that changes in mean echo-delay, i.e. range, have on echo-delay discrimination abilities and which fine-scale acoustic features dolphins use to create a coherent mental representation of a target. In Chapter 1, the dolphin's ability to detect changes in echo-delay as a function of range was determined. Chapter 2 then tested the dolphin's ability to discriminate between the ranges of two targets at different mean ranges. In this experiment targets were presented successively, meaning, the dolphin had to hold the range of one target in memory while they compared it to the second target. Chapters 1 and 2 conclude that as mean range increases greater than 10 m the dolphin's ability to discriminate between echo-delays degrades rapidly. Chapter 3 explores the possibility of the dolphin using spectral cues to determine the difference in range between two targets that are presented simultaneously. First, the dolphin's peripheral auditory system was modeled to determine available spectral cues. The dolphin's ability to discriminate the difference in range between two targets was then tested and compared under successive and simultaneous conditions. Although spectral cues were available to the dolphin, the results from the simultaneous condition suggest limited improvement when compared to the successive condition. Lastly, Chapter 4 focuses on the auditory perceived cues the dolphin may use to convert fine-scale spectral and temporal information into a coherent mental representation. By manipulating echo-phase information the results suggest that for fine-scale echo-delays the dolphins may use a pitch cue to discriminate between complex targets.

Subject Added Entry-Topical Term  

Experimental psychology.

Subject Added Entry-Topical Term  

Cognitive psychology.

Subject Added Entry-Topical Term  

Acoustics.

Subject Added Entry-Topical Term  

Behavioral sciences.

Index Term-Uncontrolled  

Dolphins

Index Term-Uncontrolled  

Echolocation

Index Term-Uncontrolled  

Target ranging

Index Term-Uncontrolled  

Phantom echoes

Index Term-Uncontrolled  

Mean echo-delays

Added Entry-Corporate Name  

University of California, San Diego Psychology

Host Item Entry  

Dissertations Abstracts International. 86-04B.

Electronic Location and Access  

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Control Number  

joongbu:656052