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2013

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Development Of Watershed-Based Modeling Approach To Pollution Source Identification, Yangbin Tong Jan 2013

Development Of Watershed-Based Modeling Approach To Pollution Source Identification, Yangbin Tong

LSU Master's Theses

Identification of unknown pollution sources is essential to environmental protection and emergency response. A review of recent publications in source identification revealed that there are very limited numbers of research in modeling methods for rivers. What’s more, the majority of these attempts were to find the source strength and release time, while only a few of them discussed how to identify source locations. Comparisons of these works indicated that a combination of biological, mathematical and geographical method could effectively identify unknown source area(s), which was a more practical trial in a watershed. This thesis presents a watershed-based modeling approach to …

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Invisible Architecture: Underwater Excavation Of Site 77, Paynes Creek National Park, Belize, Tekla Chantae Rudie Jan 2013

Invisible Architecture: Underwater Excavation Of Site 77, Paynes Creek National Park, Belize, Tekla Chantae Rudie

LSU Master's Theses

This thesis presents research concerning invisible architecture and its importance to Maya archaeology. Maya architecture, mechanisms for the disappearance of sites, and strategies for their discovery are briefly discussed. Several examples of sites with invisible architecture are then put forth, including Santa Rita Corozal, where research has determined that as much as 50% of structures at the site may be invisible. Background on previous work at the Punta Ycacos salt works in Paynes Creek National Park is presented, followed by detailed description of recent excavations at Site 77. The site consists of preserved wooden posts in the sea floor and …

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Psychological Behavior Analysis Using Advanced Signal Processing Techniques For Fmri Data, Charisma Dionne Edwards Jan 2013

Psychological Behavior Analysis Using Advanced Signal Processing Techniques For Fmri Data, Charisma Dionne Edwards

LSU Doctoral Dissertations

Psychological analysis related to voluntary reciprocal trust games were obtained using functional magnetic resonance imaging (fMRI) hyperscanning for 44 pairs of strangers throughout 36 trust games (TG) and 16 control games (CG). Hidden Markov models (HMMs) are proposed to train and classify the fMRI data acquired from these brain regions and extract the essential features of the initial decision of the first player to trust or not trust the second player. These results are evaluated using the different versions of the multifold cross-validation technique and compared to other speech data and other advanced signal processing techniques including linear classification, support …

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The Ring Theory And The Representation Theory Of Quantum Schubert Cells, Joel Benjamin Geiger Jan 2013

The Ring Theory And The Representation Theory Of Quantum Schubert Cells, Joel Benjamin Geiger

LSU Doctoral Dissertations

In recent years the quantum Schubert cell algebras, introduced by Lusztig and De Concini--Kac, and Procesi, have garnered much interest as this versatile class of objects are furtive testing grounds for noncommutative algebraic geometry. We unify the two main approaches to analyzing the structure of the torus-invariant prime spectra of quantum Schubert cell algebras, a ring theoretic one via Cauchon's deleting derivations and a representation theoretic characterization of Yakimov via Demazure modules. As a result one can combine the strengths of the two approaches. In unifying the theories, we resolve two questions of Cauchon and Mériaux, one of which involves …

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Mathematical And Computer-Based Models For Optimizing Microwave Heating Processes Of Frozen Oysters, Jie Zhang Jan 2013

Mathematical And Computer-Based Models For Optimizing Microwave Heating Processes Of Frozen Oysters, Jie Zhang

LSU Doctoral Dissertations

Consumers with full-time jobs prefer microwavable-frozen-meals for convenience when lack time to cook. Microwaves do not require a medium for heat transfer and provide quick heating even in low thermal conductivity foods, which does not occur in conventional heating. The main problem in utilizing microwave-heating for cooking is the non-uniform temperature distribution in foods which may result in insufficient lethality of microorganisms in some part. This non-uniformity can be due to a number of factors including composition and geometry of food. The objectives of this study were to develop a mathematical-model based on Maxwell¡¯s equations for predicting the temperature distribution …

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Characterization, Prevalence, And Risk Factors Of Spontaneous And Experimental Atherosclerosis And Vascular Imaging In Psittaciformes, Hugues Beaufrère Jan 2013

Characterization, Prevalence, And Risk Factors Of Spontaneous And Experimental Atherosclerosis And Vascular Imaging In Psittaciformes, Hugues Beaufrère

LSU Doctoral Dissertations

Atherosclerosis is a degenerative and inflammatory vascular disease characterized by the accumulation of inflammatory cells, lipids, calcium, and formation of large fibrofatty lesions within the intima of arteries resulting in the disorganization of the arterial wall and stenosis of the lumen. Despite the importance of atherosclerosis in psittacine cardiology, there are few pathologic, clinical, and experimental investigations in psittaciformes. In order to expand the knowledge on psittacine atherosclerosis and provide fundamental observational information for future research, a series of studies was conducted on psittaciformes: 1) psittacine atherosclerotic lesions were characterized and categorized based on histopathology, histochemistry, transmission (TEM), and scanning …

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A Study Of The Temporal And Spatial Distribution Of Ichthyoplankton And Post-Larval Penaeids Recruiting Into A Louisiana Tidal Pass, Matthew John Kupchik Jan 2013

A Study Of The Temporal And Spatial Distribution Of Ichthyoplankton And Post-Larval Penaeids Recruiting Into A Louisiana Tidal Pass, Matthew John Kupchik

LSU Doctoral Dissertations

This dissertation attempts to better understand astronomical, meteorological, and oceanographic forcing of offshore-spawned, estuarine-dependent species from continental shelf to estuarine waters through tidal passes. The vertical distribution of zoo-/ichthyoplankton within the inner continental shelf from the Louisiana Offshore Oil Platform monitoring project (1978-1995) provided an important offshore end member for the estuarine recruitment study, and is potentially useful in predicting vulnerabilities to past and future oil spills. The role that atmospheric cold front passages may have on densities and movement of zoo-/ichthyoplankton recruiting through the Bayou Tartellan tidal pass, Louisiana, were analyzed using a Generalized Additive Model. The pre-frontal phase, …

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Fluorescent Materials For Chemical Sensing, Brian Gerard Imsick Jan 2013

Fluorescent Materials For Chemical Sensing, Brian Gerard Imsick

LSU Doctoral Dissertations

Materials incorporating fluorescent π-electron conjugated molecular species for sensing and imaging are advantageous over other detection or identification methods such as colorimetric reporters. Fluorescent materials offer easy recognition of binding events due to the highly sensitive nature of fluorescence techniques down to the single molecule level. The properties of fluorescent molecules allow for rapid attenuation of observable readout due to the facile transport of excited state energy via both inter- and intramolecular pathways. This dissertation primarily focused on the development and study of a general platform for ratiometric fluorescent chemosensing using surface-immobilized oligomers, as well as in depth explorations of …

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Constructing Geographic Areas For Homicide Research : A Case Study Of New Orleans, Lawrence Keenan Robert Jan 2013

Constructing Geographic Areas For Homicide Research : A Case Study Of New Orleans, Lawrence Keenan Robert

LSU Master's Theses

Because homicides are rare events, criminologists must often deal with the Small Population Problem, which creates unreliable homicide rates based on arbitrarily delineated census tracts of low population. These rates lead to violations in several assumptions required in statistical analysis. This study proposes the Regionally Constrained Agglomerative Clustering and Partitioning (REDCAP) method to mitigate the Modifiable Areal Unit Problem and solve the Small Population Problem by constructing new, larger regions with sufficient minimum populations for homicide rate calculation. This method is used for a case study of New Orleans, Louisiana, to test the relationship between concentrated disadvantage and homicide. Ordinary …

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Evolutionary Assembly Of The Neotropical Montane Avifauna, Andres M. Cuervo Jan 2013

Evolutionary Assembly Of The Neotropical Montane Avifauna, Andres M. Cuervo

LSU Doctoral Dissertations

Three fundamental processes are thought to underlie biodiversity patterns: speciation, dispersal, and extinction. Biodiversity patterns in species-rich tropical mountains vary along horizontal (barriers), and vertical (elevation) dimensions. In this dissertation, I set out to explore the interplay between historical and ecological mechanisms hypothesized to shape diversification of Neotropical cloud forest birds. In the second chapter, I conducted comparative analyses using species-specific ecological traits, and 3,175 mtDNA sequences collected across the range of 45 co-distributed birds. First, I found that niche breadth, dispersal ability, and clade age influence lineage diversity (population differentiation). In particular, species that are old, poor dispersers, and …

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Language Of Exclusion: A Mixed Method Evaluation Of Text Complexity On Comprehension Within Selected U.S. Government Food Assistance Application Materials, Leah Katherine Saal Jan 2013

Language Of Exclusion: A Mixed Method Evaluation Of Text Complexity On Comprehension Within Selected U.S. Government Food Assistance Application Materials, Leah Katherine Saal

LSU Doctoral Dissertations

After over 60 years of plain writing advocacy calling for government agencies to increase the clarity of official communication, the Plain Writing Act (PWA) of 2010 codified the incorporation of plain language in any federal government document for pubic use. However, no extensive evaluation of government food assistance applications has been completed by an independent evaluator since the PWA’s passage. The objective of this exploratory sequential mixed methods research is to examine selected federal government food assistance applications (Supplemental Nutrition Assistance Program Application (SNAP) for Assistance and Free and Reduced Price School Meals Family Application). The study seeks to explore …

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Spatial Variations In Salinity And Temperature Around The Bay Marchand Salt Dome, Offshore Louisiana, Laurie Richards Jan 2013

Spatial Variations In Salinity And Temperature Around The Bay Marchand Salt Dome, Offshore Louisiana, Laurie Richards

LSU Master's Theses

The Bay Marchand field is located about 60 miles south of New Orleans, Louisiana on the continental shelf. The structurally complex field has produced over 960 MMBOE as of 2012 (http://www.eplweb.com), with many of these hydrocarbons being trapped against the massive salt dome and associated faulting present in the area. A study by Bruno and Hanor (2003) documented the presence of a high salinity plume off the southeast flank of the dome that had less saline and less dense pore water below it. The purpose of this study was to investigate the spatial variations in pore water salinity and temperature …

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Hydraulic Fracturing And Water Use In Dallas, Texas, Sarah Yates Jan 2013

Hydraulic Fracturing And Water Use In Dallas, Texas, Sarah Yates

LSU Master's Theses

Dallas, Texas is located in North Texas and sits above the eastern portion of the Barnett Shale natural gas formation. Hydraulic fracturing, or “fracking”, was introduced to the region as a means to access previously inaccessible natural gas within the formation. This fracking concerns many because it requires large amounts of fresh water, an average of over 4 million gallons per well within Dallas Water Utilities’ service area. This thesis examines whether water use for fracking will have a negative effect on the water supply for the city of Dallas and its wholesale water customer cities. The water is typically …

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Role Of Retrotransposons As A Major Source Of Intra- And Inter-Individual Epigenetic Variations In The Mammalian Genome, Muhammad Badre Ekram Jan 2013

Role Of Retrotransposons As A Major Source Of Intra- And Inter-Individual Epigenetic Variations In The Mammalian Genome, Muhammad Badre Ekram

LSU Doctoral Dissertations

Transcription of retrotransposons is usually repressed by DNA methylation, but a few elements partially escape this repression mechanism. I used two approaches as my dissertation study to identify unmethylated intracisternal A-particles (IAPs) and also to understand why some of IAPs escape DNA methylation-mediated repression. Firstly, I sought to catalog the retrotransposons (LTRs and LINEs only) in the mouse genome known as ‘epialleles’ which escape the repression variably even in individuals with an identical genome sequence. Using bioinformatic approaches, 143 candidate epialleles were first identified based on their promoter activity and association with active histone modification marks. Detailed methylation analyses suggested …

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Treatment Integrity Failures Matched To Behavioral Function, Joanna Elizabeth Lomas Mevers Jan 2013

Treatment Integrity Failures Matched To Behavioral Function, Joanna Elizabeth Lomas Mevers

LSU Doctoral Dissertations

Prior research on treatment integrity has focused on either the lack of measurement of the independent variable (Peterson, Homer & Wonderlich, 1982; Gresham, Gansle & Noel, 1993; Wheeler, Baggett, Fox & Blevins, 2006; McIntyre, Gresham, DiGennaro & Reed, 2007; Sanetti, Gritter & Dobey, 2011) or on methods to increase overall levels of treatment integrity(Witt, Noell, LaFleur & Mortenson, 1997; Noell, Witt, Gilbertson, Ranier & Freeland,1997; Noell et al., 2005). Yet little research has been devoted to understanding the effectiveness of common interventions when those interventions are implemented with less than perfect integrity. The current investigation evaluated the effectiveness of using …

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The Idiosyncratic Fantasies Of Bele Bachem : The Life And Work Of Germany's Forgotten Postwar Artist, Lydia Jane Dorsey Jan 2013

The Idiosyncratic Fantasies Of Bele Bachem : The Life And Work Of Germany's Forgotten Postwar Artist, Lydia Jane Dorsey

LSU Master's Theses

This thesis constitutes the first comprehensive analysis written in English on the life and work of German-born, post-World War II artist, Bele Bachem. By translating and critically analyzing her diverse oeuvre, which spanned both fields of "applied" and "fine" arts, this thesis examines the three stages of the artist’s career: Bachem’s "Poetic Miniatures" and theater set design under the Third Reich (1938-1945), her postwar commercial work after West Germany’s Wirtschaftswunder for Rosenthal Porcelain (1949-1966), and her mature style of narrative fantasy paintings and female portraits completed in the Schwabing bohemian district of Munich (1957-1986). With this thesis, I aim to …

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Reciprocal Peer Mentoring : Increasing The Prosocial Behavior Of Socially Neglected Students, Tai A. Collins Jan 2013

Reciprocal Peer Mentoring : Increasing The Prosocial Behavior Of Socially Neglected Students, Tai A. Collins

LSU Doctoral Dissertations

Two studies investigated the effectiveness of the Reciprocal Peer Mentoring intervention in improving the prosocial behavior of socially neglected elementary school students as measured by a Direct Behavior Rating filled out by their teachers. Reciprocal Peer Mentoring uses the methodological framework of the Check-In/Check-Out intervention (e.g. Hawken & Horner, 2003), but expands on it by using peers as mentors, adding a reciprocity component, focusing on prosocial behavior, and targeting socially neglected students. In Study 1, the effectiveness of Nonreciprocal Peer Mentoring was examined, as popular peers served as mentors for neglected peers. In Study 2, neglected or rejected students mentored …

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Quantification Of Total And Oil-Degrading Bacteria In Louisiana Marsh Sediment Following The Deepwater Horizon Oil Spill Using Cultivation And Real-Time Pcr Assays, Kristopher Nolan Ackoury Jan 2013

Quantification Of Total And Oil-Degrading Bacteria In Louisiana Marsh Sediment Following The Deepwater Horizon Oil Spill Using Cultivation And Real-Time Pcr Assays, Kristopher Nolan Ackoury

LSU Master's Theses

Although the impacts of the Deepwater Horizon (DWH) oil spill on the bacterial communities in several Gulf of Mexico habitats have been described, little if any research has been published evaluating the impacts of the spill on bacterial populations in the most severely oiled salt marsh soils of Barataria Bay, Louisiana. The aim of this study was to define the effects of the spill on the total and oil-degrading bacterial communities in these marshes. Using quantitative real-time PCR (qPCR) and traditional cultivation methods bacterial communities from contaminated marsh soils were examined thirteen, twenty-two, and twenty-nine months after the initial oiling …

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Evaluation Of An Automated Delivery Verification System For Volumetric Modulated Arc Therapy Treatments, John-Paul Grenier Jan 2013

Evaluation Of An Automated Delivery Verification System For Volumetric Modulated Arc Therapy Treatments, John-Paul Grenier

LSU Master's Theses

Purpose: The purpose of this work was to evaluate the ability of a treatment delivery verification system to detect clinically significant mechanical errors in VMAT delivery utilizing data contained within a commercial record and verify (RV) system, and to test whether the system can be used to reconstruct dose distributions that agree more closely with measured dose distributions than do the original treatment plans. Methods: VMAT treatment plans from five prostate patients, five head and neck patients, and five post-mastectomy chest wall patients treated at our clinic were selected for this study. Known mechanical errors were introduced into each plan, …

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Causes And Consequences Of Conflict : Exploring The Influence Of Honor-Based Norms And Values On The Experience Of Intimate Partner Violence In The United States, Michelle Elaine Pence Jan 2013

Causes And Consequences Of Conflict : Exploring The Influence Of Honor-Based Norms And Values On The Experience Of Intimate Partner Violence In The United States, Michelle Elaine Pence

LSU Doctoral Dissertations

The three studies in this dissertation were posed with the common goal of revealing possible explanations for variations in the causes and consequences of interpersonal violence across regional cultures of the United States. Study 1 posed and tested two hypotheses related to the distribution of male-perpetrated intimate partner homicide across regions of the United States. The South and West, two regions characterized in full (the South) or in part (the West) by honor cultures, emerged as the regions with the highest rates of argument- and conflict- related, male-on-female intimate partner homicides in single victim/single offender incidents. Explanations provided at the …

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Role Of Nod2/Rip2 Signaling In Acute Bacterial Pneumonia And Sepsis, Balamayooran Theivanthiran Jan 2013

Role Of Nod2/Rip2 Signaling In Acute Bacterial Pneumonia And Sepsis, Balamayooran Theivanthiran

LSU Doctoral Dissertations

Bacterial pneumonia and sepsis are two important causes of mortality in the world. Emergence of multidrug resistant bacteria has necessitated the development of new treatment and/or prevention strategies to augment host immune defense. In this context, the innate host defense is critical in clearing pathogenic bacteria from the host. Early neutrophil recruitment is a critical step in a multistep requence leading to bacterial clearance. Pattern recognition receptors (PRRs) play a critical role in the innate immune system. Receptor interacting protein 2 (RIP-2) is an adaptor for the nod-like receptors (NLR) NOD1 and NOD2. Nucleotide oligomerisation domain 2 (NOD2) is an …

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Socially Oriented Negative Self-Referent Cognition : The Development And Validation Of A Measure, Brittany Moree Rudy Jan 2013

Socially Oriented Negative Self-Referent Cognition : The Development And Validation Of A Measure, Brittany Moree Rudy

LSU Doctoral Dissertations

Social phobia, a debilitating disorder among children and adolescents, is thought to be made up of cognitive, behavioral, and physiological components. However, in children, the cognitive component of this disorder has been largely neglected by researchers. Therefore, the purpose of this study was to create and validate a new instrument, the "Socially Oriented Negative Anxious Statement (SONAS) scale,” that assesses socially oriented negative self-referent cognition in a younger population. Measurement validation procedures including, reliability, validity, and factor analysis, were utilized to examine the proposed questionnaire. Results indicated that the SONAS scale demonstrated good psychometric properties, including a sound two-factor structure …

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Treatments To Reduce The Risk Of Vibrio Species In Vitro And In Shucked Oysters, Ronson Renard Scott Jan 2013

Treatments To Reduce The Risk Of Vibrio Species In Vitro And In Shucked Oysters, Ronson Renard Scott

LSU Master's Theses

"Vibrio parahaemolyticus" (Vp) and "Vibrio vulnificus" (Vv) are halophilic bacteria naturally occurring in estuarine environments that may concentrate in filter feeding shellfish. Consumption of raw or under-cooked seafood contaminated with Vp or Vv may lead to the development of acute gastroenteritis or fatal septicemia in at-risk individuals, respectively. This research encompassed two separate but related projects: evaluation of a low temperature pasteurization (LTP) technique for the reduction of Vp and Vv in commercial quantities of shucked oysters (SO) and the investigation of the efficacy of a citrus fruit extract, BIOSECUR® F440D in reducing/eliminating Vv in vitro. Commercially available SO ("Crassostrea …

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Lifestyle Factors And Risk Of Heart Failure: A Prospective Cohort Study, Yujie Wang Jan 2013

Lifestyle Factors And Risk Of Heart Failure: A Prospective Cohort Study, Yujie Wang

LSU Doctoral Dissertations

Heart failure (HF) has become a major health problem with its high prevalence, poor clinical outcomes, and large health-care costs. Compared with medical intervention, the prevention of HF through lifestyle approaches is free of side effect. Therefore, the prevention of HF through lifestyle approaches is of special interest. In this project, we aim to investigate 1) the association of different levels of occupational, commuting and leisure-time physical activity with HF risk; 2) the association of coffee consumption with HF risk; 3) the role of lifestyle factors in explaining the risk of HF; and 4) the association between antihypertensive drug treatment …

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Lowbrow Art : The Unlikely Defender Of Art History's Tradition, Joseph R. Givens Jan 2013

Lowbrow Art : The Unlikely Defender Of Art History's Tradition, Joseph R. Givens

LSU Master's Theses

This thesis has as twofold purpose. First, it will show that Lowbrow Art fits into the framework of art history and is worthy of art history’s attention. Second, it will argue for a revalidation of “traditional” art historical methods by proving that the methods are applicable to a marginalized contemporary art movement. Lowbrow Art is one of the most distinctive and vibrant art movements in the world, but there has yet to be a thorough examination of this style. Despite the undeniable worldwide success of the Lowbrow Art movement, it remains relatively obscure in academic discourse. Perhaps one reason why …

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Adaptive Stochastic Conjugate Gradient Optimization For Temporal Medical Image Registration, Huanhuan Xu Jan 2013

Adaptive Stochastic Conjugate Gradient Optimization For Temporal Medical Image Registration, Huanhuan Xu

LSU Master's Theses

We propose an Adaptive Stochastic Conjugate Gradient (ASCG) optimization algorithm for temporal medical image registration. This method combines the advantages of Conjugate Gradient (CG) method and Adaptive Stochastic Gradient Descent (ASGD) method. The main idea is that the search direction of ASGD is replaced by stochastic approximations of the conjugate gradient of the cost function. In addition, the step size of ASCG is based on the approximation of the Lipschitz constant of the stochastic gradient function. Thus, this algorithm could maintain the good properties of the conjugate gradient method, meanwhile it uses less gradient computation time per iteration and adjusts …

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Molecular-Level Investigations Combining Nanoscale Lithography And Atomic Force Microscopy, Chamarra Karmelia Saner Jan 2013

Molecular-Level Investigations Combining Nanoscale Lithography And Atomic Force Microscopy, Chamarra Karmelia Saner

LSU Doctoral Dissertations

In this dissertation, nanostructures of octadecyltrichlorosilane (OTS) and were prepared using particle lithography and evaluated using characterizations with atomic force microscopy (AFM). The nanostructures of OTS were used as a resist for patterning fibronectin, an extracellular matrix protein. Particle lithography provides a practical and reproducible approach to generate billions of nanostructures comprised of organic thin films or nanomaterials. A film of mesospheres can be applied as a surface mask to define the periodicity and size of nanopatterns using processes of self-assembly. A close-packed arrangement of mesospheres is produced spontaneously when monodisperse solutions of latex or silica are dried on a …

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Influence Of Various Health Beneficial Spices On Some Characteristics Of Yogurt Culture Bacteria Lactobacillus Acidophilus, And Sensor Acceptability Of Spicy Probiotic Yogurt, Margie Michelle Sanchez-Vega Jan 2013

Influence Of Various Health Beneficial Spices On Some Characteristics Of Yogurt Culture Bacteria Lactobacillus Acidophilus, And Sensor Acceptability Of Spicy Probiotic Yogurt, Margie Michelle Sanchez-Vega

LSU Doctoral Dissertations

There is a pronounced public awareness about herbal remedies. Garlic and ginger have antibacterial properties and prevent cardiovascular diseases. Onion and turmeric decrease the risk of diabetes and like garlic, they have anticancer properties. Streptococcus thermophilus, Lactobacillus bulgaricus and Lactobacillus acidophilus are lactic acid bacteria that produce lactase and reduce the symptoms of malabsorption. Earlier work has shown the influence of spice extracts but the influence of pure spice juice on yogurt culture bacteria is not known. Characteristics of yogurt culture bacteria were measured by suspending freshly thawed cultures in 0.1% peptone water (growth), acidified MRS broth (acid tolerance), MRS-Thio …

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The Effects Of Chronic And Acute Exercise Modalities On Substrate Utilization And Plasma Adiponectin Concentration, Greggory Ryan Davis Jan 2013

The Effects Of Chronic And Acute Exercise Modalities On Substrate Utilization And Plasma Adiponectin Concentration, Greggory Ryan Davis

LSU Doctoral Dissertations

Impaired lipid metabolism at rest has been linked to the development of insulin resistance and an attenuation of plasma concentration of the hormone adiponectin. However, it has been suggested that increasing fatty acid oxidation at rest, via exercise or otherwise, may augment plasma adiponectin. The current literature addressing changes substrate utilization and possible direct effects on adiponectin during and following exercise is not well established. Therefore, the purpose of this dissertation was to examine concomitant changes in adiponectin and substrate utilization both at rest and during various exercise modalities, as this may provide implications for improving metabolic responses and in …

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Exploratory And Confirmatory Factor Analyses Of The Symptom Structure For Autism Spectrum Disorders Using The Baby And The Infant Screen For Children With Autism Traits, Megan Sipes Jan 2013

Exploratory And Confirmatory Factor Analyses Of The Symptom Structure For Autism Spectrum Disorders Using The Baby And The Infant Screen For Children With Autism Traits, Megan Sipes

LSU Doctoral Dissertations

Since autism spectrum disorders (ASD) were first identified, the diagnostic criteria and conceptualization of symptom structure have undergone many revisions. Currently, under the Diagnostic and Statistical Manual of Mental Disorders-Fourth Edition-Text Revision (DSM-IV-TR; American Psychiatric Association (APA), 2000), ASD is defined by three symptom categories: impairments in socialization, deficits in communication, and repetitive/restricted behaviors. With the publication of the DSM-5 (APA, 2011), however, ASD will be defined by a two symptom cluster structure in which the main impairments are in the areas of social communication and restricted/repetitive behaviors. With these changes, many assessment measures will need to be re-examined to …

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