Special fields of psychology
SPECIAL FIELDS OF PSYCHOLOGY
Contents
1. Introduction
2. Physiological psychology
3. Psychoanalysis
4. Behaviourism
5. Gestalt psychology
6 .Cognition
7. Tests and Measurements
8. Development psychology
9. Social psychology
10. Psychiatry and mental health
11. Forensic psychology and criminology
12. Psychology, religion and phenomenology
13. Parapsychology
14. Industrial Psychology
Vocabulary
Literature
1. Introduction
Psychology, scientific study of behavior and experience—that is, the
study of how human beings and animals sense, think, learn, and know.
Modern psychology is devoted to collecting facts about behavior and
experience and systematically organizing such facts into psychological
theories. These theories aid in understanding and explaining people’s
behavior and sometimes in predicting and influencing their future
behavior.
Psychology, historically, has been divided into many subfields of
study; these fields, however, are interrelated and frequently overlap.
Physiological psychologists, for instance, study the functioning of the
brain and the nervous system, and experimental psychologists devise
tests and conduct research to discover how people learn and remember.
Subfields of psychology may also be described in terms of areas of
application. Social psychologists, for example, are interested in the
ways in which people influence one another and the way they act in
groups. Industrial psychologists study the behavior of people at work
and the effects of the work environment. School psychologists help
students make educational and career decisions. Clinical psychologists
assist those who have problems in daily life or who are mentally ill.
History. The science of psychology developed from many diverse sources,
but its origins as a science may be traced to ancient Greece.
Philosophical Beginnings. Plato and Aristotle, as well as other Greek
philosophers, took up some of the basic questions of psychology that
are still under study: Are people born with certain skills, abilities,
and personality, or do all these develop as a result of experience? How
do people come to know the world? Are certain ideas and feelings
innate, or are they all learned?
Such questions were debated for many centuries, but the roots of modern
psychological theory are found in the 17th century in the works of the
French philosopher Ren Descartes and the British philosophers Thomas
Hobbes and John Locke. Descartes argued that the bodies of people are
like clockwork machines, but that their minds (or souls) are separate
and unique. He maintained that minds have certain inborn, or innate,
ideas and that these ideas are crucial in organizing people’s
experiencing of the world. Hobbes and Locke, on the other hand,
stressed the role of experience as the source of human knowledge. Locke
believed that all information about the physical world comes through
the senses and that all correct ideas can be traced to the sensory
information on which they are based.
Most modern psychology developed along the lines of Locke’s view. Some
European psychologists who studied perception, however, held onto
Descartes’s idea that some mental organization is innate, and the
concept still plays a role in theories of perception and cognition.
Against this philosophical background, the field that contributed most
to the development of scientific psychology was physiology—the study of
the functions of the various organ systems of the body. The German
physiologist Johannes Miller tried to relate sensory experience both to
events in the nervous system and to events in the organism’s physical
environment. The first true experimental psychologists were the German
physicist Gustav Theodor Fechner and the German physiologist Wilhelm
Wundt. Fechner developed experimental methods for measuring sensations
in terms of the physical magnitude of the stimuli producing them.
Wundt, who in 1879 founded the first laboratory of experimental
psychology in Leipzig, Germany, trained students from around the world
in this new science.
Physicians who became concerned with mental illness also contributed to
the development of modern psychological theories. Thus, the systematic
classification of mental disorders developed by the German psychiatric
pioneer Emil Kraepelin remains the basis for methods of classification
that are now in use. Far better known, however, is the work of Sigmund
Freud, who devised the system of investigation and treatment known as
psychoanalysis. In his work, Freud called attention to instinctual
drives and unconscious motivational processes that determine people’s
behavior. This stress on the contents of thought, on the dynamics of
motivation rather than the nature of cognition in itself, exerted a
strong influence on the course of modern psychology.
Modern psychology still retains many aspects of the fields and kinds of
speculation from which it grew. Some psychologists, for example, are
primarily interested in physiological research, others are medically
oriented, and a few try to develop a more encompassing, philosophical
understanding of psychology as a whole. Although some practitioners
still insist that psychology should be concerned only with behavior—and
may even deny the meaningfulness of an inner, mental life—more and more
psychologists would now agree that mental life or experience is a valid
psychological concern.
The areas of modern psychology range from the biological sciences to the
social sciences.
2. Physiological psychology
The study of underlying physiological bases of psychological functions
is known as physiological psychology. The two major communication
systems of the body—the nervous system and the circulatory system—are
the focus of most research in this area.
The nervous system consists of the central nervous system (the brain
and the spinal cord) and its outlying neural network, the peripheral
nervous system; the latter communicates with the glands and muscles and
includes the sensory receptors for seeing, hearing, smelling, tasting,
touching, feeling pain, and sensing stimuli within the body. The
circulatory system circulates the blood and also carries the important
chemical agents known as hormones from the glands to all parts of the
body. Both these communication systems are very important in overall
human behavior.
The smallest unit of the nervous system is the single nerve cell, or
neuron. When a neuron is properly stimulated, it transmits
electrochemical signals from one place in the system to another. The
nervous system has 12.5 billion neurons, of which about 10 billion are
in the brain itself.
One part of the peripheral nervous system, the somatic system,
transmits sensations into the central nervous system and carries
commands from the central system to the muscles involved in movement.
Another part of the peripheral nervous system, the autonomic system,
consists of two divisions that have opposing functions. The sympathetic
division arouses the body by speeding the heartbeat, dilating the
pupils of the eye, and releasing adrenaline into the blood. The
parasympathetic division operates to calm the body by reversing these
processes.
A simple example of communication within the nervous system is the
spinal arc, which is seen in the knee-jerk reflex. A tap on the
patellar tendon, just below the kneecap, sends a signal to the spinal
cord via sensory neurons. This signal activates motor neurons that
trigger a contraction of the muscle attached to the tendon; the
contraction, in turn, causes the leg to jerk. Thus, a stimulus can lead
to a response without involving the brain, via a connection through the
spinal cord.
Circulatory communication is ordinarily slower than nervous-system
communication. The hormones secreted by the body’s endocrine glands
circulate through the body, influencing both structural and behavioral
changes . The sex hormones, for example, that are released during
adolescence effect many changes in body growth and development as well
as changes in behavior, such as the emergence of specific sexual
activity and the increase of interest in the opposite sex. Other
hormones may have more direct, short-term effects; for instance,
adrenaline, which is secreted when a person faces an emergency,
prepares the body for a quick response—whether fighting or flight.
3. Psychoanalysis
Psychoanalysis, name applied to a specific method of investigating
unconscious mental processes and to a form of psychotherapy. The term
refers, as well, to the systematic structure of psychoanalytic theory,
which is based on the relation of conscious and unconscious
psychological processes.
Theory of Psychoanalysis
The technique of psychoanalysis and much of the psychoanalytic theory based
on its application were developed by Sigmund Freud. His work concerning the
structure and the functioning of the human mind had far-reaching
significance, both practically and scientifically, and it continues to
influence contemporary thought.
The Unconscious
The first of Freud’s innovations was his recognition of unconscious
psychiatric processes that follow laws different from those that govern
conscious experience. Under the influence of the unconscious, thoughts and
feelings that belong together may be shifted or displaced out of context;
two disparate ideas or images may be condensed into one; thoughts may be
dramatized in the form of images rather than expressed as abstract
concepts; and certain objects may be represented symbolically by images of
other objects, although the resemblance between the symbol and the original
object may be vague or farfetched. The laws of logic, indispensable for
conscious thinking, do not apply to these unconscious mental productions.
Recognition of these modes of operation in unconscious mental processes
made possible the understanding of such previously incomprehensible
psychological phenomena as dreaming. Through analysis of unconscious
processes, Freud saw dreams as serving to protect sleep against disturbing
impulses arising from within and related to early life experiences. Thus,
unacceptable impulses and thoughts, called the latent dream content, are
transformed into a conscious, although no longer immediately
comprehensible, experience called the manifest dream. Knowledge of these
unconscious mechanisms permits the analyst to reverse the so-called dream
work, that is, the process by which the latent dream is transformed into
the manifest dream, and through dream interpretation, to recognize its
underlying meaning.
Instinctual Drives
A basic assumption of Freudian theory is that the unconscious conflicts
involve instinctual impulses, or drives, that originate in childhood. As
these unconscious conflicts are recognized by the patient through analysis,
his or her adult mind can find solutions that were unattainable to the
immature mind of the child. This depiction of the role of instinctual
drives in human life is a unique feature of Freudian theory.
According to Freud’s doctrine of infantile sexuality, adult sexuality is an
end product of a complex process of development, beginning in childhood,
involving a variety of body functions or areas (oral, anal, and genital
zones), and corresponding to various stages in the relation of the child to
adults, especially to parents. Of crucial importance is the so-called
Oedipal period, occurring at about four to six years of age, because at
this stage of development the child for the first time becomes capable of
an emotional attachment to the parent of the opposite sex that is similar
to the adult’s relationship to a mate; the child simultaneously reacts as a
rival to the parent of the same sex. Physical immaturity dooms the child’s
desires to frustration and his or her first step toward adulthood to
failure. Intellectual immaturity further complicates the situation because
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