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Psychology

<OpenstaxParagraph>
	The concept of personality has been studied for at least 2,000 years, beginning with Hippocrates in 370 BCE (Fazeli, 2012). Hippocrates theorized that personality traits and human behaviors are based on four separate temperaments associated with four fluids (“humors”) of the body: choleric temperament (yellow bile from the liver), melancholic temperament (black bile from the kidneys), sanguine temperament (red blood from the heart), and phlegmatic temperament (white phlegm from the lungs) (Clark &amp; Watson, 2008; Eysenck &amp; Eysenck, 1985; Lecci &amp; Magnavita, 2013; Noga, 2007). Centuries later, the influential Greek physician and philosopher <OpenstaxTerm>Galen</OpenstaxTerm> built on Hippocrates’s theory, suggesting that both diseases and personality differences could be explained by imbalances in the humors and that each person exhibits one of the four temperaments. For example, the choleric person is passionate, ambitious, and bold; the melancholic person is reserved, anxious, and unhappy; the sanguine person is joyful, eager, and optimistic; and the phlegmatic person is calm, reliable, and thoughtful (Clark &amp; Watson, 2008; Stelmack &amp; Stalikas, 1991). Galen’s theory was prevalent for over 1,000 years and continued to be popular through the Middle Ages.
</OpenstaxParagraph>
<OpenstaxParagraph>
	In 1780, Franz Gall, a German physician, proposed that the distances between bumps on the skull reveal a person’s personality traits, character, and mental abilities (<a href="#Figure_11_01_Phrenology">Figure 11.3</a>). According to Gall, measuring these distances revealed the sizes of the brain areas underneath, providing information that could be used to determine whether a person was friendly, prideful, murderous, kind, good with languages, and so on. Initially, phrenology was very popular; however, it was soon discredited for lack of empirical support and has long been relegated to the status of pseudoscience (Fancher, 1979).
</OpenstaxParagraph>
<OpenstaxFigure id="Figure_11_01_Phrenology" src="https://openstax.org/apps/archive/20240226.174525/resources/a14732df065a5e9340583a75bec7e8e036521f7b" alt="Photograph A shows the cover of the American Phrenological Journal circa 1848. Across the top it reads: “American Phrenological Journal.” Below that it says “Know thyself.” Below that is a picture of a human head facing left, with many pictures comprising the area where the brain is. Below the person’s ear it says “Home truths for home consumption.” The lines below that read: “1848,” “Vol. X, March, No. 3,” “O.S. Fowler, Editor,” “Phrenology, Physiology, Physiognomy, Magnetism,” “New York,” “Fowlers and Wells,” “Phrenological cabinet, 131 Nassau-Street,” and “Terms $1 a year, invariably in advance. Ten cts. a Number.” Photograph B shows a printed cartoon of a person in a chair with another person behind. There are three other people in the room, and the wall is decorated with various skulls. Below the picture it reads: “Drawn on Stone by E.H,” and “The Phrenologist.”" mediaType="image/jpeg" width="975" height="503" />
<OpenstaxFigureText width="975">
	<strong>Figure 11.3</strong> The pseudoscience of measuring the areas of a person’s skull is known as phrenology. (a) Gall developed a chart that depicted which areas of the skull corresponded to particular personality traits or characteristics (Hothersall, 1995). (b) An 1825 lithograph depicts Gall examining the skull of a young woman. (credit b: modification of work by Wellcome Library, London)
</OpenstaxFigureText>
<OpenstaxParagraph>
	In the centuries after Galen, other researchers contributed to the development of his four primary temperament types, most prominently Immanuel Kant (in the 18th century) and psychologist Wilhelm <OpenstaxTerm>Wundt</OpenstaxTerm> (in the 19th century) (Eysenck, 2009; Stelmack &amp; Stalikas, 1991; Wundt, 1874/1886) (<a href="#Figure_11_01_FourTemper">Figure 11.4</a>). Kant agreed with Galen that everyone could be sorted into one of the four temperaments and that there was no overlap between the four categories (Eysenck, 2009). He developed a list of traits that could be used to describe the personality of a person from each of the four temperaments. However, Wundt suggested that a better description of personality could be achieved using two major axes: emotional/nonemotional and changeable/unchangeable. The first axis separated strong from weak emotions (the melancholic and choleric temperaments from the phlegmatic and sanguine). The second axis divided the changeable temperaments (choleric and sanguine) from the unchangeable ones (melancholic and phlegmatic) (Eysenck, 2009).
</OpenstaxParagraph>
<OpenstaxFigure id="Figure_11_01_FourTemper" src="https://openstax.org/apps/archive/20240226.174525/resources/f8e99849343e7abf0b2cbe63807562005005179b" alt="A circle is divided vertically and horizontally into four sections by lines with arrows at the ends. Clockwise from the top, the arrows are labeled “Strong Emotions,” “Changeable Temperaments,” “Weak Emotions,” and “Unchangeable Temperaments.” The arcs around the perimeter of the circle, clockwise beginning with the top right segment are labeled “Choleric,” “Sanguine,” “Phlegmatic,” and “Melancholic.” The sections inside each arc contain descriptive words. Inside the Choleric arc are the words “excitable, egocentric, exhibitionist, impulsive, histrionic, and active.” Inside the Sanguine arc are the words “playful, easygoing, sociable, carefree, hopeful, and contented.” Inside the Phlegmatic arc are the words “reasonable, principled, controlled, persistent, steadfast, and calm.” Inside the Melancholic arc are the words “anxious, worried, unhappy, suspicious, serious, and thoughtful.”" mediaType="image/jpeg" width="731" height="573" />
<OpenstaxFigureText width="731">
	<strong>Figure 11.4</strong> Developed from Galen’s theory of the four temperaments, Kant proposed trait words to describe each temperament. Wundt later suggested the arrangement of the traits on two major axes.
</OpenstaxFigureText>
<OpenstaxParagraph>
	Sigmund Freud’s psychodynamic perspective of personality was the first comprehensive theory of personality, explaining a wide variety of both normal and abnormal behaviors. According to Freud, unconscious drives influenced by sex and aggression, along with childhood sexuality, are the forces that influence our personality. <OpenstaxTerm>Freud</OpenstaxTerm> attracted many followers who modified his ideas to create new theories about personality. These theorists, referred to as neo-Freudians, generally agreed with Freud that childhood experiences matter, but they reduced the emphasis on sex and focused more on the social environment and effects of culture on personality. The perspective of personality proposed by Freud and his followers was the dominant theory of personality for the first half of the 20th century.
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<OpenstaxParagraph>
	Other major theories then emerged, including the learning, humanistic, biological, evolutionary, trait, and cultural perspectives. In this chapter, we will explore these various perspectives on personality in depth.
</OpenstaxParagraph>
<OpenstaxNote>
	<OpenstaxNoteTitle> Link to Learning </OpenstaxNoteTitle> 
	<OpenstaxParagraph>
		View this <a href="http://openstax.org/l/mandela">video of an overview of some of the psychological perspectives on personality</a> to learn more.
	</OpenstaxParagraph>
</OpenstaxNote>

11.1.1 Historical Perspectives

1 Introduction to Psychology

1.1 What Is Psychology?

1.1.1 Why Study Psychology?

1.2 History of Psychology

1.2.1 Wundt and Structuralism

1.2.2 Functionalism

1.2.3 Freud and Psychoanalytic Theory

1.2.4 Wertheimer, Koffka, Köhler, and Gestalt Psychology

1.2.5 Pavlov, Watson, Skinner, and Behaviorism

1.2.6 Maslow, Rogers, and Humanism

1.2.7 The Cognitive Revolution

1.2.8 Multicultural And Cross-Cultural Psychology

1.2.9 Women in Psychology

1.3 Contemporary Psychology

1.3.1 Biopsychology and Evolutionary Psychology

1.3.2 Sensation and Perception

1.3.3 Cognitive Psychology

1.3.4 Developmental Psychology

1.3.5 Personality Psychology

1.3.6 Social Psychology

1.3.7 Industrial-Organizational Psychology

1.3.8 Health Psychology

1.3.9 Sport and Exercise Psychology

1.3.10 Clinical Psychology

1.3.11 Forensic Psychology

1.4 Careers in Psychology

1.4.1 Other Careers in Academic Settings

1.4.2 Career Options Outside of Academic Settings

2 Psychological Research

2.1 Why Is Research Important?

2.1.1 Use of Research Information

2.1.2 NOTABLE RESEARCHERS

2.1.3 The Process of Scientific Research

2.2 Approaches to Research

2.2.1 Clinical or Case Studies

2.2.2 Naturalistic Observation

2.2.3 Surveys

2.2.4 Archival Research

2.2.5 Longitudinal and Cross-Sectional Research

2.3 Analyzing Findings

2.3.1 Correlational Research

2.3.2 Causality: Conducting Experiments and Using the Data

2.3.3 Reliability and Validity

2.4 Ethics

2.4.1 Research Involving Human Participants

2.4.2 Research Involving Animal Subjects

3 Biopsychology

3.1 Human Genetics

3.1.1 Genetic Variation

3.1.2 Gene-Environment Interactions

3.2 Cells of the Nervous System

3.2.1 Neuron Structure

3.2.2 Neuronal Communication

3.2.3 Neurotransmitters and Drugs

3.3 Parts of the Nervous System

3.3.1 Peripheral Nervous System

3.4 The Brain and Spinal Cord

3.4.1 The Spinal Cord

3.4.2 The Two Hemispheres

3.4.3 Forebrain Structures

3.4.4 Midbrain and Hindbrain Structures

3.4.5 Brain Imaging

3.5 The Endocrine System

3.5.1 Major Glands

4 States of Consciousness

4.1 What Is Consciousness?

4.1.1 Biological Rhythms

4.1.2 Problems With Circadian Rhythms

4.2 Sleep and Why We Sleep

4.2.1 What is Sleep?

4.2.2 Why Do We Sleep?

4.3 Stages of Sleep

4.3.1 NREM Stages of Sleep

4.3.2 REM Sleep

4.4 Sleep Problems and Disorders

4.4.1 Insomnia

4.4.2 Parasomnias

4.4.3 Sleep Apnea

4.4.4 Narcolepsy

4.5 Substance Use and Abuse

4.5.1 Substance Use Disorders

4.5.2 Drug Categories

4.6 Other States of Consciousness

4.6.1 Hypnosis

4.6.2 Meditation

5 Sensation and Perception

5.1 Sensation versus Perception

5.1.1 Sensation

5.1.2 Perception

5.2 Waves and Wavelengths

5.2.1 Amplitude and Wavelength

5.2.2 Light Waves

5.2.3 Sound Waves

5.3 Vision

5.3.1 Anatomy of the Visual System

5.3.2 Color and Depth Perception

5.4 Hearing

5.4.1 Anatomy of the Auditory System

5.4.2 Pitch Perception