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                            Walden University
Five Factor Personality Traits in Schizophrenics with a History of Violent Behavior
	Ashley Lust
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Page 1

Walden University

Walden Dissertations and Doctoral Studies
Walden Dissertations and Doctoral Studies



Five Factor Personality Traits in Schizophrenics
with a History of Violent Behavior
Ashley Lust
Walden University

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Walden University

College of Social and Behavioral Sciences

This is to certify that the doctoral dissertation by

Ashley Lust

has been found to be complete and satisfactory in all respects,
and that any and all revisions required by
the review committee have been made.

Review Committee

Dr. Sandra Caramela-Miller, Committee Chairperson, Psychology Faculty
Dr. C. Tom Diebold, Committee Member, Psychology Faculty
Dr. Victoria Latifses, University Reviewer, Psychology Faculty

Chief Academic Officer
Eric Riedel, Ph.D.

Walden University

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anonymous, was kept secure and confidential. The conclusion of the chapter includes the

discussions of the anticipated test results and statistical relationships within chapter 4.

Research Design and Rationale


The independent variables, personality traits, were examined and analyzed by use of

personality inventories. The personality traits examined were those inclusive within the

FFM: neuroticism, extraversion, openness, conscientiousness, and agreeableness.

Researchers possess a greater confidence in their findings by using an already developed and

tested personality inventory. The personality inventory utilized in the original research

study was the NEO-FFI, the shortened version of the NEO-PI-R specifically designed to

examine the FFM (Costa & McCrae, 1992b).

The dependent variables, violent and nonviolent behaviors identified, were initially

examined and acknowledged by Ohi, Shimada, and Kawasaki (2015) by performing

unstructured clinical interviews, in addition to reviewing patient medical records. An

individual with a violent or nonviolent behavior defined the dependent variable within the

given data set. The definition of violence used to assess the behaviors within this data set

was the one provided and described by Darrell-Berry et al. (2016), in which extreme harm is

the intended outcome or goal of displayed aggression.

Connection to Research Questions

This quantitative study looked at the relationship between an individuals displayed

behavior and specific personality traits, as defined by the FFM. This study’s research

questions explored the relationship present between violent and nonviolent behavior and

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personality among individuals diagnosed with schizophrenia, an area of research not fully

addressed in previous research studies. Ohi, Shimada, and Kawasaki (2015) had originally

gathered data in order to perform a research study determining the intermediate phenotypes

for psychiatric disorders. Their research included various aspects and background

information of its participants. This information included NEO-FFI scores, diagnosis of

schizophrenia by at least two trained psychiatrists using the criteria of the DSM-5, as well as

age, gender, years of education, and their estimated premorbid intelligent quotient (IQ)(Ohi,

Shimada, & Kawasaki, 2015). However, the researchers had not analyzed the data to

determine the relationship of demonstrated personality traits among schizophrenics, and how

it correlates to their violent or nonviolent behavior.

The personality traits within the FFM are further described as having 6 facets to

further break down the traits. Each of the research questions pertaining to these personality

traits addressed the corresponding 6 facets. These facets were further identified and

examined with the use of the NEO-PI-R (Costa & McCrae, 1992b). However, although the

following information addresses the facets related to the identified research questions, only

the single trait scores from the NEO-PI-R and found in the NEO-FFI were utilized within

the proposed research. The identification of these facets have the potential to provide

further insight into what is influential to the single trait score of each factor.

Research question 1 looked to identify the difference in neuroticism scores of violent

and nonviolent individuals diagnosed with schizophrenia. The neuroticism trait within the

FFM has the 6 facets of anxiety, angry hostility, depression, self-consciousness,

impulsiveness, and vulnerability (Costa & McCrae, 1992a). An individual scoring higher

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Appendix A: Permission Letter for Research Data

September 20, 2016

Dear Dr. Kazutaka Ohi,

My name is Ashley Lust-Morton and I am a doctoral student at Walden University in

the Forensic Psychology program. As part of the requirements for the completion of my

PhD within Forensic Psychology, I am designing and conducting a dissertation research

project under the guidance and supervision of my dissertation chair, Dr. Sandra Caramela-

Miller, my methods specialist, Dr. Charles T. Diebold, and the university research reviewer,

Dr. Victoria Latifses. The title of this research is “Five Factor Personality Traits in

Schizophrenics with Criminal Behavior History”.

I came across the meta-analysis performed by you and your colleagues, “The Five

Factor Model personality traits in schizophrenia: A meta-analysis. The research within this

meta-analysis has two variables and aspects I am interested in: the diagnosis of

schizophrenia among the individuals, and their scores on the NEO-FFI (Costa & McCrae,

1992). I am hoping to find some sort of relationship between these two variables, and the

their criminal history. With your permission, I would like to utilize the data you had

gathered and was utilized within this meta-analysis. You will receive complete

acknowledgement and credit regarding the data being used. Furthermore, I would protect

the raw data and would not provide it to any researcher who may ask.

My question regarding the use of the data is whether you are the final ‘owner’ of this

research data, or if there are other individuals or organizations I may need to contact. The

Internal Review Board (IRB) at Walden University is willing to give a conditional approval

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and generate a letter to be sent to you and anyone else for further confirmation. If you are

the only owner of the data, the data usage agreement attached needs to be physically signed

and a copy either emailed to the IRB directly at [email protected] or faxed to (626) 605-

0472. I have attached the data usage agreement to this letter.

Please contact me if you have further questions regarding my interest in the data in

question. I have provided both my email address and my personal phone number. Please do

not hesitate to contact me. I am looking to start data analysis as soon as possible, meaning

the sooner I hear back from you the better. I greatly appreciate you taking the time to

respond and potentially helping me in my pursuit of my doctorate. Thank you for your time.


Ashley Lust-Morton

Ph.D. Forensic Psychology Study

Walden University

[email protected]

(515) 707-8599 - mobile

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