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Psychology

<OpenstaxParagraph>
	Adolescence is a socially constructed concept. In pre-industrial society, children were considered adults when they reached physical maturity, but today we have an extended time between childhood and adulthood called adolescence. <OpenstaxTerm>Adolescence</OpenstaxTerm> is the period of development that begins at puberty and ends at emerging adulthood, which is discussed later. In the United States, adolescence is seen as a time to develop independence from parents while remaining connected to them (<a href="#Figure_09_04_Adolescent">Figure 9.15</a>). The typical age range of adolescence is from 12 to 18 years, and this stage of development also has some predictable physical, cognitive, and psychosocial milestones.
</OpenstaxParagraph>
<OpenstaxFigure id="Figure_09_04_Adolescent" src="https://openstax.org/apps/archive/20240226.174525/resources/0b823efdca083be0d94ab78e28f2efa6672be364" alt="A photograph captures four people midair as they hold hands and jump." mediaType="image/jpeg" width="325" height="168" />
<OpenstaxFigureText width="325">
	Figure 9.15 Peers are a primary influence on our development in adolescence. (credit: "manseok_Pixabay"/ Pixabay)
</OpenstaxFigureText>
<OpenstaxH3>Physical Development</OpenstaxH3>
<OpenstaxParagraph>
	As noted above, adolescence begins with puberty. While the sequence of physical changes in puberty is predictable, the onset and pace of puberty vary widely. Several physical changes occur during puberty, such as <OpenstaxTerm>adrenarche</OpenstaxTerm> and <OpenstaxTerm>gonadarche</OpenstaxTerm>, the maturing of the adrenal glands and sex glands, respectively. Also during this time, primary and secondary sexual characteristics develop and mature. <OpenstaxTerm>Primary sexual characteristics</OpenstaxTerm> are organs specifically needed for reproduction, like the uterus and ovaries and testes. <OpenstaxTerm>Secondary sexual characteristics</OpenstaxTerm> are physical signs of sexual maturation that do not directly involve sex organs, such as development of breasts and hips, and development of facial hair and a deepened voice. <OpenstaxTerm>Menarche</OpenstaxTerm>, the beginning of menstrual periods, usually occurs around 12–13 years old, and <OpenstaxTerm>spermarche</OpenstaxTerm>, the first ejaculation, around 13–14 years old.
</OpenstaxParagraph>
<OpenstaxParagraph>
	During puberty, people experience a rapid increase in height (i.e., growth spurt). For females this begins between 8 and 13 years old, with adult height reached between 10 and 16 years old. Males begin their growth spurt slightly later, usually between 10 and 16 years old, and reach their adult height between 13 and 17 years old. Both nature (i.e., genes) and nurture (e.g., nutrition, medications, and medical conditions) can influence height.
</OpenstaxParagraph>
<OpenstaxParagraph>
	Because rates of physical development vary so widely among teenagers, puberty can be a source of pride or embarrassment. Early maturing boys tend to be stronger, taller, and more athletic than their later maturing peers. They are usually more popular, confident, and independent, but they are also at a greater risk for substance abuse and early sexual activity (Flannery, Rowe, &amp; Gulley, 1993; Kaltiala-Heino, Rimpela, Rissanen, &amp; Rantanen, 2001). Early maturing girls may be teased or overtly admired, which can cause them to feel self-conscious about their developing bodies. These girls are at a higher risk for depression, substance abuse, and eating disorders (Ge, Conger, &amp; Elder, 2001; Graber, Lewinsohn, Seeley, &amp; Brooks-Gunn, 1997; Striegel-Moore &amp; Cachelin, 1999). Late blooming boys and girls (i.e., they develop more slowly than their peers) may feel self-conscious about their lack of physical development. Negative feelings are particularly a problem for late maturing boys, who are at a higher risk for depression and conflict with parents (Graber et al., 1997) and more likely to be bullied (Pollack &amp; Shuster, 2000).
</OpenstaxParagraph>
<OpenstaxParagraph>
	Psychologists and clinicians also study the impact of gender identity and the impacts of puberty on transgender and gender-nonconforming youth. This is a relatively recent area of study, and the impacts should not be over-generalized. However, the research seems to indicate that transgender and gender-nonconforming youth who are supported in their identity do not have significantly higher incidences of depression or anxiety symptoms when compared to control groups, while those who are not supported exhibit more symptoms and risk factors (Olson, Durwood, &amp; McLaughlin, 2016). Expression and exploration of gender identity can take many forms and manifest at different times depending on a wide array of factors. 
</OpenstaxParagraph>
<OpenstaxParagraph>
	The adolescent brain also remains under development. Up until puberty, brain cells continue to bloom in the frontal region. Adolescents engage in increased risk-taking behaviors and emotional outbursts possibly because the frontal lobes of their brains are still developing (<a href="#Figure_09_04_TeenBrain">Figure 9.16</a>). Recall that this area is responsible for judgment, impulse control, and planning, and it is still maturing into early adulthood (Casey, Tottenham, Liston, &amp; Durston, 2005).
</OpenstaxParagraph>
<OpenstaxFigure id="Figure_09_04_TeenBrain" src="https://openstax.org/apps/archive/20240226.174525/resources/1aefd4ccc54684d8afae35da46828327e4a182f5" alt="An illustration of a brain is shown with the frontal lobe labeled." mediaType="image/jpeg" width="487" height="362" />
<OpenstaxFigureText width="487">
	Figure 9.16 Brain growth continues into the early 20s. The development of the frontal lobe, in particular, is important during this stage.
</OpenstaxFigureText>
<OpenstaxNote>
	<OpenstaxNoteTitle> Link to Learning </OpenstaxNoteTitle> 
	<OpenstaxParagraph>
		According to neuroscientist Jay Giedd in the Frontline video “Inside the Teenage Brain” (2013), “It’s sort of unfair to expect [teens] to have adult levels of organizational skills or decision-making before their brains are finished being built.” Watch this segment on <a href="http://openstax.org/l/wiringbrain">“The Wiring of the Adolescent Brain”</a> to find out more about the developing brain during adolescence.
	</OpenstaxParagraph>
</OpenstaxNote>
<OpenstaxH3>Cognitive Development</OpenstaxH3>
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	More complex thinking abilities emerge during adolescence. Some researchers suggest this is due to increases in processing speed and efficiency rather than as the result of an increase in mental capacity—in other words, due to improvements in existing skills rather than development of new ones (Bjorkland, 1987; Case, 1985). During adolescence, teenagers move beyond concrete thinking and become capable of abstract thought. Recall that Piaget refers to this stage as formal operational thought. Teen thinking is also characterized by the ability to consider multiple points of view, imagine hypothetical situations, debate ideas and opinions (e.g., politics, religion, and justice), and form new ideas (<a href="#Figure_09_04_Reasoning">Figure 9.17</a>). In addition, it’s not uncommon for adolescents to question authority or challenge established societal norms.
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<OpenstaxParagraph>
	<OpenstaxTerm>Cognitive empathy</OpenstaxTerm>, also known as theory-of-mind (which we discussed earlier with regard to egocentrism), relates to the ability to take the perspective of others and feel concern for others (Shamay-Tsoory, Tomer, &amp; Aharon-Peretz, 2005). Cognitive empathy begins to increase in adolescence and is an important component of social problem solving and conflict avoidance. According to one longitudinal study, levels of cognitive empathy begin rising in girls around 13 years old, and around 15 years old in boys (Van der Graaff et al., 2013). Teens who reported having supportive fathers with whom they could discuss their worries were found to be better able to take the perspective of others (Miklikowska, Duriez, &amp; Soenens, 2011).
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<OpenstaxFigure id="Figure_09_04_Reasoning" src="https://openstax.org/apps/archive/20240226.174525/resources/d469b961542c10b3cb934657648deb27d55c5e38" alt="A picture shows four people gathered around a table attempting to figure out a problem together." mediaType="image/jpeg" width="325" height="217" />
<OpenstaxFigureText width="325">
	Figure 9.17 Teenage thinking is characterized by the ability to reason logically and solve hypothetical problems such as how to design, plan, and build a structure. (credit: U.S. Army RDECOM)
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<OpenstaxH3>Psychosocial Development</OpenstaxH3>
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	Adolescents continue to refine their sense of self as they relate to others. Erikson referred to the task of the adolescent as one of identity versus role confusion. Thus, in Erikson’s view, an adolescent’s main questions are “Who am I?” and “Who do I want to be?” Some adolescents adopt the values and roles that their parents expect for them. Other teens develop identities that are in opposition to their parents but align with a peer group. This is common as peer relationships become a central focus in adolescents’ lives.
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<OpenstaxParagraph>
	As adolescents work to form their identities, they pull away from their parents, and the peer group becomes very important (Shanahan, McHale, Osgood, &amp; Crouter, 2007). Despite spending less time with their parents, most teens report positive feelings toward them (Moore, Guzman, Hair, Lippman, &amp; Garrett, 2004). Warm and healthy parent-child relationships have been associated with positive child outcomes, such as better grades and fewer school behavior problems, in the United States as well as in other countries (Hair et al., 2005).
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<OpenstaxParagraph>
	It appears that most teens don’t experience adolescent storm and stress to the degree once famously suggested by G. Stanley Hall, a pioneer in the study of adolescent development. Only small numbers of teens have major conflicts with their parents (Steinberg &amp; Morris, 2001), and most disagreements are minor. For example, in a study of over 1,800 parents of adolescents from various cultural and ethnic groups, Barber (1994) found that conflicts occurred over day-to-day issues such as homework, money, curfews, clothing, chores, and friends. These types of arguments tend to decrease as teens develop (Galambos &amp; Almeida, 1992). There is emerging research on the adolescent brain. Galvan, Hare, Voss, Glover and Casey (2007) examined its role in risk-taking behavior. They used fMRI to assess the readings’ relationship to risk-taking, risk perception, and impulsivity. The researchers found that there was no correlation between brain activity in the neural reward center and impulsivity and risk perception. However, activity in that part of the brain was correlated to risk taking. In other words, risk-taking adolescents experienced brain activity in the reward center. The idea that adolescents, however, are more impulsive than other demographics was challenged in their research, which included children and adults.
</OpenstaxParagraph>
<OpenstaxH3>Emerging Adulthood</OpenstaxH3>
<OpenstaxParagraph>
	The next stage of development is <OpenstaxTerm>emerging adulthood</OpenstaxTerm>. This is a relatively newly defined period of lifespan development spanning from 18 years old to the mid-20s, characterized as an in-between time where identity exploration is focused on work and love.
</OpenstaxParagraph>
<OpenstaxParagraph>
	When does a person become an adult? There are many ways to answer this question. In the United States, you are legally considered an adult at 18 years old. But other definitions of adulthood vary widely; in sociology, for example, a person may be considered an adult when they become self-supporting, choose a career, get married, or start a family. The ages at which we achieve these milestones vary from person to person as well as from culture to culture. For example, in the African country of Malawi, 15-year-old Njemile was married at 14 years old and had her first child at 15 years old. In her culture she is considered an adult. Children in Malawi take on adult responsibilities such as marriage and work (e.g., carrying water, tending babies, and working fields) as early as 10 years old. In stark contrast, independence in Western cultures is taking longer and longer, effectively delaying the onset of adult life.
</OpenstaxParagraph>
<OpenstaxParagraph>
	What factors are leading to these changes regarding financial and familial independence? It seems that emerging adulthood is a product of both Western culture and our current times (Arnett, 2000). People in higher income and more industrialized countries are living longer, allowing the freedom to take an extra decade to start a career and family. Changes in the workforce also play a role. For example, 50 years ago, a young adult with a high school diploma could immediately enter the work force and climb the economic ladder. That is no longer the case. Bachelor’s and even graduate degrees are required more and more often—even for entry-level jobs (Arnett, 2000). In addition, many students are taking longer (five or six years) to complete a college degree as a result of working and going to school at the same time. After graduation, many young adults return to the family home because they have difficulty finding a job. The term Boomerang Generation describes recent college graduates for whom lack of adequate employment upon college graduation often leads to a return to the parental home (Davidson, 2014). Changing cultural expectations may be the most important reason for the delay in entering adult roles. Young people are spending more time exploring their options, so they are delaying marriage and work as they change majors and jobs multiple times, putting them on a much later timetable than their parents (Arnett, 2000).
</OpenstaxParagraph>

9.3.3 Adolescence

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

Question	Answer
period of development that begins at puberty and ends at early adulthood	adolescence
maturing of the adrenal glands	adrenarche
ability to take the perspective of others and to feel concern for others	cognitive empathy
newly defined period of lifespan development from 18 years old to the mid-20s; young people are taking longer to complete college, get a job, get married, and start a family	emerging adulthood
maturing of the sex glands	gonadarche
beginning of menstrual period; around 12–13 years old	menarche
organs specifically needed for reproduction	primary sexual characteristics
physical signs of sexual maturation that do not directly involve sex organs	secondary sexual characteristics
first male ejaculation	spermarche