Chapter 1
An Introduction to Lifespan
Development
Chapter Outline
I.
An orientation to lifespan development
A. LIFESPAN DEVELOPMENT is the field
of study that examines patterns of growth, change, and stability in behavior
that occur throughout the entire lifespan.
1. Developmental psychologists
test their assumptions about the nature and course of human development by
applying scientific methods.
2. Lifespan development focuses
on human development.
a) universal principles of
development
b) cultural, racial, ethnic differences
c) individual traits and
characteristics
3. Lifespan developmentalists
view development as a lifelong, continuing process.
4. Lifespan developmentalists
focus on change and growth in addition to stability, consistency, and
continuity in people's lives.
5. Lifespan developmentalists
are interested in people's lives from the moment of conception until death.
B. Topical areas in lifespan
development
1. PHYSICAL DEVELOPMENT involves the
body's physical makeup, including the brain, nervous system, muscles, and
senses, and the need for food, drink, and sleep.
2. COGNITIVE DEVELOPMENT involves the ways that
growth and change in intellectual capabilities influence a person's behavior.
3. PERSONALITY DEVELOPMENT involves the
ways that the enduring characteristics that differentiate one person from
another change over the lifespan.
4. SOCIAL DEVELOPMENT is the way in which individual's
interactions with others and their social relationships grow, change, and
remain stable over the course of life.
C. Age ranges and individual
differences
1. The lifespan is usually
divided into broad age ranges.
a) Prenatal period (conception
to birth)
b) Infancy and toddlerhood (birth to age 3)
c) Preschool period (ages 3 to
6)
d) Middle childhood (ages 6 to
12)
e) Adolescence (ages 12 to 20)
f) Young adulthood (ages 20 to
40)
g) Middle adulthood (ages 40 to
60)
h) Late adulthood (age 60 to
death)
2.
It is important to remember that people mature at different rates and
reach developmental milestones at different points.
3.
Environmental factors, such as one's culture, can play a significant
role in determining the age at which a particular event is likely to occur.
4.
In addition, age ranges are averages
and some people will show substantial deviation.
D. The Context of Development:
Taking a Broad Perspective
1. The ECOLOGICAL APPROACH (Bronfenbrenner) is the perspective suggesting that different
levels of environment simultaneously influence individuals.
a) The microsystem is the everyday,
immediate environment such as homes, caregivers, friends, teachers.
b) The mesosystem connects various
aspects of the microsystem, linking children to
parents, students to teachers, employees to bosses, friends to friends.
c) The exosystem represents such broad
influences as local government, the community, schools, places of worship, and
the local media.
d) The macrosystem represents larger
cultural influences such as society in general, types of government, religious
systems, and political thought.
2. There are several advantages
to taking an ecological approach to development.
a) It emphasizes the
interconnectedness of the influences on development.
b) It illustrates that
influences are multidirectional.
c) It stresses the importance
of broad cultural factors that affect development.
3.
Developmental
Diversity: How Culture, Ethnicity, and
Race Influence Development
a)
Developmentalists must take into
consideration broad cultural factors and ethnic, racial, socioeconomic, and
gender differences if they are to achieve an understanding of how people change
and grow throughout the lifespan.
b)
Progress concerning issues of human diversity has been slow in the
field of lifespan development.
c)
Members of the research community have sometimes used terms such as race and ethnic group in inappropriate ways.
(1)
Race is a biological concept
referring to classifications based on physical and structural characteristics.
(2)
Ethnic group and ethnicity are broader terms, referring to cultural background,
nationality, religion, and language.
d)
There is little agreement about which names best reflect different
races and ethnic groups (i.e., African-American or black.)
e) Race is not independent of
environmental and cultural contexts.
4. Cohort and Normative
influences on Development: Developing
with Others in a Social World
a) one's COHORT is the group of people
born at around the same time and same place.
b) NORMATIVE HISTORY-GRADED INFLUENCES are the
biological and environmental influences associated with a particular historical
moment.
c) NORMATIVE AGE-GRADED INFLUENCES are
biological and environmental influences that are similar for individuals in a
particular age group, regardless of when or where they are raised.
d) NORMATIVE SOCIOCULTURAL-GRADED INFLUENCES include the impact of social and cultural factors present at a
particular time for a particular individual, depending on such variables as
ethnicity, social class, and subcultural membership.
e) NONNORMATIVE LIFE EVENTS are specific, atypical
events that occur in a particular person's life at a time when they do not
happen to most people.
E.
Key Issues and
Questions: Determining the Nature – and
Nurture – of Lifespan Development
1. Continuous Change Versus
Discontinuous Change
a) CONTINUOUS CHANGE involves gradual
development in which achievements at one level build on those of previous
levels.
b) DISCONTINUOUS CHANGE is
development that occurs in distinct steps or stages, with each stage bringing
about behavior that is assumed to be qualitatively different from behavior at
earlier stages.
2. Critical Periods: Gauging the Impact of Environmental Events
a) A CRITICAL PERIOD is a specific
time during development when a particular event has its greatest consequences.
b) Because individuals are now
considered more malleable than was first thought, developmentalists
are more likely to speak of SENSITIVE
PERIODS as a point in development
when organisms are particularly susceptible to certain kinds of stimuli in
their environments, but the absence of those stimuli does not always produce
irreversible consequences.
3. Lifespan Approaches Versus a
Focus on Particular Periods
a) Early developmentalists
focused on "infancy" and "adolescence."
b) Today the entire lifespan is
seen as important for several reasons.
(1) growth and change continue
throughout life
(2) an important part of every
person’s environment is the other people around him or her, the person’s social
environment
4. The Relative Influence of
Nature Versus Nurture on Development
a) Nature
refers to traits, abilities, and capacities that are inherited from one's
parents.
(1) It encompasses MATURATION, any factor that is produced by the predetermined unfolding of genetic
information.
b) Nurture refers to the environmental influences that shape behavior.
c) Developmental psychologists
reject the notion that behavior is the result solely of either nature or
nurture.
d) It is useful to think of the
nature-nurture controversy as opposite ends of a continuum, with particular
behaviors falling somewhere between the two ends.
II.
Theoretical Perspectives
A. THEORIES are explanations and predictions
concerning phenomena of interest, providing a framework for understanding the
relationships among an organized set of facts or principles.
B. The PSYCHODYNAMIC PERSPECTIVE is
the approach that states behavior is motivated by inner forces, memories, and
conflicts of which a person has little awareness or control.
1. Freud's PSYCHOANALYTIC THEORY suggests
that unconscious forces act to determine personality and behavior.
a) According to Freud (1856 -
1939),
(1) the unconscious is a part of the personality about which a person is
unaware and is responsible for much of our everyday behavior;
(2) one's personality has three
aspects:
(a) ID,
the raw, unorganized, inborn part of
personality that is present at birth that represents primitive drives related
to hunger, sex, aggression, and irrational impulses.
(i) Operates according to the pleasure principle, in which the goal is
to maximize satisfaction and reduce tension.
(3) EGO,
the part of personality that is rational and reasonable.
(a) Acts as a buffer between the
outside world and the
primitive id.
(b)
Operates on the reality principle, in which instinctual energy is
restrained in order to maintain the safety of the individual and help integrate
the person into society.
(4)
SUPEREGO, the aspect of personality
that represents a person's
conscience, incorporating distinctions between right and wrong.
(a) Develops about age 5 or 6.
(b) Learned from parents,
teachers, and other significant figures.
b) Freud suggested that PSYCHOSEXUAL DEVELOPMENT is a series of stages that children pass
through in which pleasure, or gratification is focused on a particular
biological function and body part.
(1) Oral (birth to 12-18 months)
(2) Anal (12 - 18 months to 3 years)
(3) Phallic (3 to 5 - 6 years)
(4) Latency (5 - 6 years to adolescence)
(5) Genital (adolescence to adulthood)
c) If children are unable to
gratify themselves sufficiently or receive too much gratification a FIXATION, behavior reflecting an earlier stage of development, may occur.
2. Erikson's Psychosocial Theory
a) PSYCHOSOCIAL DEVELOPMENT is the
approach that encompasses changes in the understanding individuals have of both
their interactions with others, and others' behavior, and of themselves as
members of society.
b) Erikson (1902 - 1994) suggested
that developmental change occurs throughout our lives in eight distinct stages.
(1) Trust vs. Mistrust (birth to 12 - 18 months)
(2) Autonomy vs. Shame and
Doubt (12 - 18 months to 3 years)
(3) Initiative vs. Guilt (3 to 5 - 6 years)
(4) Industry vs.
Inferiority (5 - 6 years to adolescence)
(5) Identity vs. Role
diffusion (adolescence to adulthood)
(6) Intimacy vs. Isolation (early adulthood)
(7) Generativity vs. Stagnation (middle adulthood)
(8) Ego Integrity vs.
Despair (late adulthood)
c) Each stage emerges in a
fixed pattern and is similar for all people.
d) Each stage presents a crisis
or conflict that each individual must address sufficiently at a particular age.
e) No crisis is ever fully
resolved, which makes life increasingly complicated.
f) Unlike Freud, Erikson believed that development continued throughout the
lifespan.
3. Assessing the Psychodynamic
Perspective
a) Contemporary psychological
research supports the idea that unconscious memories have an influence on our
behavior.
b) The notion that people pass
through stages in childhood that determine their adult personalities has little
research support.
c) Because Freud based his
theory on a small sample of upper-middle-class Austrians living during a
strict, puritanical era, it is questionable how applicable the theory is to muticultural populations.
d) Because his theory focuses
on men, it has been criticized as sexist and devaluing women.
e) Erikson’s view that development
continues throughout the lifespan is highly important and has received
considerable support.
f) Erikson also focused more on men
than women.
g) Much of Erikson's
theory is too vague to test rigorously.
h) In sum, the psychodynamic
perspective provides a good description of past behavior, but imprecise
predictions of future behavior.
C. The BEHAVIORAL PERSPECTIVE suggests
that the keys to understanding development are observable behavior and outside
stimuli in the environment.
1. Behaviorists reject the
notion that people universally pass through a series of stages.
2. Development occurs as the
result of continuing exposure to specific factors in the environment.
3. Development is viewed as
quantitative rather than qualitative.
4. John B. Watson (1878 - 1958)
argued that by effectively controlling a person's environment, it was possible
to produce virtually any behavior.
5. CLASSICAL CONDITIONING is a type of
learning in which an organism responds in a particular way to a neutral
stimulus that normally does not bring about that type of response.
6. OPERANT CONDITIONING is a form of
learning in which a voluntary response is strengthened or weakened, depending
on its association with positive or negative consequences.
a) B. F. Skinner (1904 - 1990)
claimed that people operate on their
environments to bring about a desired state of affairs.
b) Reinforcement is the process by which a stimulus is provided that increases the
probability that a preceding behavior will be repeated.
c) Punishment, the introduction of an unpleasant or painful stimulus or the removal
of a desirable stimulus, will decrease the probability that a behavior will
occur in the future.
d) When behavior receives no
reinforcement it is likely to be discontinued or extinguished.
e) Principles of operant
conditioning are used in BEHAVIOR
MODIFICATION, a formal technique for
promoting the frequency of desirable behaviors and decreasing the incidence of
unwanted ones.
7. Albert Bandura
suggests that a certain amount of learning is in the form of SOCIAL-COGNITIVE LEARNING THEORY, which is learning by observing the behavior
of another person, called a model.
a) Observer must pay attention
to model's behavior.
b) Observer must successfully
recall the behavior.
c) Behavior must be reproduced
accurately.
d) Observer must be motivated
to learn and carry out behavior.
8. Assessing the Behavioral
Perspective
a) According to classical and
operant conditioning, people and organisms are black boxes in which nothing that occurs inside is understood or
even cared about.
b) Social-cognitive learning
theory argues that what makes people different from rats and pigeons
is mental activity which must be taken into account.
c) Social-cognitive learning
theory has come to predominate over classical and operant conditioning.
D. The COGNITIVE PERSPECTIVE focuses on the processes that allow people
to know, understand, and
think about the world.
1. Piaget's Theory of Cognitive
Development
a) Jean Piaget (1896 - 1980)
proposed that all people pass in a fixed sequence through a series of universal
stages of cognitive development.
b) In each stage, the quantity
of information increases; the quality of knowledge and understanding changes as
well.
c) Piaget suggested that human
thinking is arranged into schemes,
organized mental patterns that represent behaviors and actions.
d) Piaget suggested that the
growth of children's understanding of the world can be explained by two
principles:
(1) ASSIMILATION is the process in which people
understand an experience in terms of their current stage of cognitive
development and way of thinking.
(2) ACCOMMODATION is the process that changes
existing ways of thinking in response to encounters with new stimuli or events.
e) Assessing Piaget’s Theory
(1) thousands of investigations have
shown it to be largely accurate.
(2) Some cognitive skills emerge
earlier than Piaget suggested.
(3) Some cognitive skills emerge
according to a different timetable in non-Western countries.
(a) In every culture, some adults
never reach Piaget's highest level of cognitive thought - formal, logical
thought.
f) Some developmentalists
believe cognitive thought does not develop discontinuously but slowly and
steadily and continuously.
2. INFORMATION-PROCESSING APPROACHES are the model that seeks to identify the ways individuals take in, use, and store information.
a) The theory grew out of the
computer age.
b) They assume that even
complex behaviors such as learning, remembering, categorizing, and thinking can
be broken down into a series of individual steps.
c) They assume cognitive growth
is more quantitative than qualitative.
d) They suggest that as people
age, they are better able to control their mental processing and change the
strategies they choose to process information.
3. Vygotsky (1896 - 1934), a Russian child developmentalist, developed SOCIOCULTURAL THEORY, an approach that emphasizes how cognitive development proceeds as a result of social interactions between members of a culture.
a) Vygotsky argued that children’s understanding of the world
is acquired through their problem-solving interactions with adults and other
children.
b) He also argued that to
understand the course of development we must consider what is meaningful to
members of a given culture.
4. The HUMANISTIC PERSPECTIVE contends that people have a natural capacity
to make decisions about their lives and control their behavior.
c) According to this approach,
each individual has the ability and motivation to reach more advanced levels of
maturity, and people naturally seek to reach their full potential.
d) This perspective emphasizes free will, the ability of humans to make
choices and come to decisions about their lives.
e) Carl Rogers suggests that
all people have a need for positive regard that results from an underlying wish
to be loved and respected.
f) Abraham Maslow
suggests that self-actualization, a
state of self-fulfillment in which people achieve their highest potential in
their own unique way, is a primary goal in life.
g) Assessing the Humanistic
Perspective
(1) The humanistic perspective
has not had a major impact on the field of lifespan development.
(2) It has not identified any
sort of broad developmental change that is the result of age or experience.
(3) Some criticize the theory’s assumption that people are
basically good, which is unverifiable.
5.
The
EVOLUTIONARY PERSPECTIVES seek to identify behavior in today’s humans that is the result of
our genetic inheritance from our
ancestors.
a) Evolutionary perspectives
grew out of the work of Charles Darwin who argued in The Origin of Species that a process of natural selection creates
traits in a species that are adaptive to their environment.
b) The evolutionary
perspectives argue that our genetic inheritance determines not only such
physical traits as skin and eye color, but certain personality traits and
social behaviors.
c) The evolutionary perspective
draws on the field of ethology (Konrad
Lorenz 1903 - 1989), which examines the ways in which our biological makeup
influences our behavior.
d) The evolutionary perspective
encompasses one of the fastest growing areas within the field of lifespan
development: behavioral genetics,
which studies the effects of heredity on behavior.
e) Assessing the evolutionary
perspectives
(1)
Some developmentalists criticize the
evolutionary perspective for paying insufficient attention to the environment
and social factors.
(2)
Others argue that there is no good way to support experimentally theories
derived from evolution.
E. Which Approach is
Right? The Wrong Question
1. Each emphasizes different
aspects of development.
2. Psychodynamic approach
emphasizes emotions, motivational conflicts, and unconscious determinants of
behavior.
3. Behavioral approaches
emphasize overt behavior.
4. Cognitive and humanist
approaches look more at what people think
than what they do.
5. The evolutionary perspective
focuses on how inherited biological factors underlie development.
III.
Research Methods
A. The SCIENTIFIC METHOD is the
process of posing and answering questions using careful, controlled techniques
that include systematic, orderly observation and the collection of data.
1. The scientific method
involves the formulation of theories, broad explanations, and predictions about
phenomena.
2. Theories are used to develop
HYPOTHESES, predictions stated in a way that permits testing.
B. Research Strategies
1. CORRELATIONAL RESEARCH seeks to
identify whether an association or relationship between two factors exists.
a) The strength and direction
of a relationship between two factors is represented by a mathematical score,
called a correlational coefficient, which ranges from +1.0
(positive) to -1.0 (negative).
(1) A positive correlation
indicates that as the value of one factor increases, it can be predicted that
the value of the other will also increase.
(2) A negative correlation
informs us that as the value of one factor increases, the value of the other
factor declines.
b) Finding that two variables
are correlated with one another proves nothing about causality.
c) Types of Correlational
Studies
(1) NATURALISTIC OBSERVATION is the
observation of a naturally occurring behavior without intervention in the
situation.
(a) This type of study has the
advantage of seeing children in their natural habitats.
(b) However, researchers cannot
control factors of interest and may be unable to see enough behavior to draw
any conclusions.
(c) Children may know they are
being watched and modify their behavior.
(d) Naturalistic observation
employs ethnography, a method
borrowed from the field of anthropology and used to investigate cultural
questions.
(i) Researchers using
ethnography act as participant observers, living for a period of weeks, months,
or even years in another culture.
(ii) Ethnography has the same
drawbacks as other naturalistic observation in addition to the problems of
generalizing from one culture to another or misinterpreting what is observed.
(2) CASE STUDIES involve extensive, in-depth
interviews with a particular individual or a small group of individuals.
(3) SURVEY RESEARCH, where people are chosen to
represent some larger population and are asked questions about their attitudes,
behavior, or thinking on a given topic.
2. Experiments: Determining Cause and Effect
a) An EXPERIMENT is a process in
which an investigator, called an experimenter, devises two different
experiences for subjects or participants.
b) These are called TREATMENTS, procedures applied by an investigator based on two different
experiences devised for participants.
c) The group receiving the treatment is known as the TREATMENT GROUP.
d) The CONTROL GROUP is the group
that receives either no treatment or alternative treatment.
e) The formation of treatment
and control groups represents the INDEPENDENT
VARIABLE, the variable that
researchers manipulate in an experiment.
f) In contrast, the DEPENDENT VARIABLE is the variable that researchers measure in an experiment and expect to
change as a result of the experimental manipulation.
g) A critical step in the
design of an experiment is to assign participants to different treatment groups
on the basis of chance alone, called random
assignment, allowing the researcher, through laws of statistics, to draw
conclusions with confidence.
h) Choosing a Research Setting
(1) First, researchers choose a SAMPLE, a group of participants chosen for the experiment.
(2) FIELD STUDY is a research investigation
carried out in a naturally occurring setting.
(3) LABORATORY STUDY is a research investigation
conducted in a controlled setting explicitly designed to hold events constant.
3. Theoretical and Applied
Research
a) THEORETICAL RESEARCH is research
designed specifically to test some developmental explanation and expand scientific
knowledge.
b) APPLIED RESEARCH is research meant to provide
practical solutions to immediate problems.
4. Measuring developmental
change
a) In LONGITUDINAL RESEARCH, the
behavior of one or more individuals is measured as the subjects
age.
(1) they require a tremendous
investment of time
(2) there is the possibility of
participant attrition, or loss
(3) participants may become
"test-wise"
b) In CROSS-SECTIONAL RESEARCH, people
of different ages are compared at the same point in time.
(1) differences may be due to
cohort effects
(2) selective dropout, where participants in some
age groups are more likely to quit participating in the study than others.
(3) unable to explain changes in
individuals or groups
c) In CROSS-SEQUENTIAL STUDIES, researchers
examine a number of different age groups over several points in time.
(1) combines longitudinal and
cross-sectional research
(2) can tell about age changes and age differences
5. Ethics and Research
a) Society
for Research in Child Development and the American Psychological Association
have
developed ethical guidelines for researchers.
(1) Freedom from harm
(2) Informed consent
(3) Use of deception
(4) Maintenance of privacy
Key Terms and Concepts
Lifespan development
Physical development
Cognitive development
Personality development
Social development
Ecological approach
Cohort
Normative history-graded influences
Normative age-graded influences
Normative sociocultural-graded
influences
Nonnormative life events
Continuous change
Discontinuous change
Critical period
Sensitive period
Maturation
Theories
Psychodynamic perspective
Psychoanalytic theory
Id
Ego
Superego
Psychosexual development
Fixation
Psychosocial development
Behavioral perspective
Classical conditioning
Operant conditioning
Behavior modification
Social-cognitive learning theory
Cognitive perspective
Assimilation
Accommodation
Information processing approaches
Sociocultural theory
Humanistic theory
Evolutionary perspective
Scientific method
Hypothesis
Correlational research
Experimental research
Naturalistic observation
Case studies
Survey research
Experiment
Treatment
Treatment group
Control group
Independent variable
Dependent variable
Sample
Field study
Laboratory study
Theoretical research
Applied research
Longitudinal research
Cross-sectional research
Cross-sequential studies