CHAPTER 1 | Developmental psychology: themes and research |
Introduction
In this book, we are concerned with human development from early childhood through to adulthood. What is development and what are the types of development that are of particular interest to psychologists, teachers, health care professionals, and others concerned with the healthy growth of children?
In essence, development refers to systematic, age-related changes in physical and psychological functioning. Systematic physical changes include basic biological developments that result from conception, as well as those that are the result of the interaction of biological and genetic processes and environmental influences. Systematic changes in psychological growth encompass a whole host of characteristics such as cognitive, personal, social, emotional, and moral characteristics.
Developmental changes may be qualitative, such as an infant progressing from crawling to walking, or quantitative, such as an infant becoming more and more adept at walking. Some developmental theorists, such as Piaget, believe that only qualitative changes are the real markers of development. In Piagetās stage theory of cognitive development, which is described in detail in Chapter 5, children go through four discrete cognitive stages of development each characterised by different cognitive capacities. Other psychologists, such as information processing psychologists put more emphasis on quantitative changes, such as the improved speed with which an individual can process and encode specific information. While information processing psychologists believe that qualitative changes do occur in childrenās thinking as they grow older, the elements of information processing are available to children at an early age and they acquire increased sophistication in their use as they grow older (see, for example, Veenman & Spaans, 2005).
Draw a timeline of major features of your development until adulthood. Which of the changes were qualitative in nature? Which of the changes were quantitative? Which type of change do you consider as a more significant marker of your personal development?
Another characteristic of development is continuity. Many developmental psychologists consider that once development has commenced for an individual there is a regularity and predictability about it that allows us to predict the future course of development for that individual. For example, if a child demonstrated a low academic or physical ability early in life, this will probably continue as a trend throughout the childās development. Freudās theory, which we consider later in the book is a good example of a theory that holds that personal development shows continuity based on early life experiences of the individual, which is relatively impervious to change. Of course, many other developmental psychologists argue that there is just as much evidence for discontinuity in development whereby individuals experiencing environmental interventions of various types may begin on a developmental trajectory quite different from predicted. Foremost among these psychologists were the early behavioural theorists such as John. B. Watson and Burrhus. F. Skinner who believed that an individualās behaviour was malleable depending on environmental experiences, and in particular, the reinforcing experiences an individual had for particular behaviour. Continuity in development allows prediction and intervention, however, as we have indicated, many theorists believe that a considerable number of human characteristics show discontinuity in developmental trends.
Consider your own development since you were a youngster. Which of your characteristics show continuity across your life? Are there characteristics that have changed? If so, what were the circumstances for the change?
Knowledge of physical and psychological development patterns and milestones, qualitative and quantitative changes, continuity and discontinuity, prepares professionals for their daily interactions with children and adolescents as they grow to maturity. Such knowledge guides teachers, social workers, nurses, psychologists, and doctors in their development of effective educational and health programmes to maximise the development of each individual. Typical patterns of development that characterise most children and adolescents allow such professionals to design programmes that may be applied generally. In contrast, knowledge of atypical patterns that vary from norms allows professionals to individualise health and educational programmes to suit the needs of particular individuals. In this book, we will consider each perspective.
Studying development
Psychology, as a discipline of science, refers to the study of human behaviour, and in particular, the study of the behaviour of individuals and groups. Psychologists study behaviour in order to understand human nature and why people do the things they do. Behaviour may be overt, as in a child demanding attention, or covert, as in a personās stomach contracting. Behaviour has both cognitive and affective elements. Much behaviour appears logical, orderly, and constructive. At other times, behaviour might appear irrational, strange, and bizarre. Behaviour might be simple or complex. Developmental psychology, as the name implies, studies, in particular, the development of human capacities such as thinking, feeling, and behaving. Developmental psychologists are interested in the various stages and elements of development, the principles of maturation, the effects of early experience and later practice on development, and a host of other issues.
In order to obtain valid and reliable information on child and adolescent development it is necessary to study development closely. Developmental psychology has had a long history of systematically obtaining, through rigorous observation and controlled studies, essential information on the regularities and exceptions to development that have guided professionals, and which forms the basis of information in books such as this one (see, for example, Hergenhahn & Henley, 2014). Two elements are important in the study of development, first, describing development, and second, explaining development. In our treatment of development throughout this book we will both describe the key elements of development over physical and psychological domains, and where appropriate, attempt to explain the nature and course of development.
There has also been centuries of theoretical and philosophical speculation on the nature of human development, and in particular, whether development is innately āhot wiredā into the system at conception, an approach often referred to as nativist or hereditarian, or whether development is much more malleable and subject to environmental influences, often referred to as empiricist, or environmentalist. This issue is often referred to as the natureānurture debate, which we discuss in Chapter 2.
If you were to look through the history of psychology, you would also see that over the last two centuries there has been a considerable shift from identifying a few basic stages of human development such as childhood and adulthood, through to an ever-increasing identification and refinement of stages. These refined stages include not only infancy, early childhood, middle childhood, late childhood, adolescence, and adulthood, but also an entire life span approach encompassing old age as a separate developmental stage (see, for example, Santrock, 2009). In this book we divide our examination of most topics into discrete time frames such as early, middle and late childhood, and adolescence. However, you should be aware that these divisions are somewhat arbitrary and you should read across the topics in order to get a complete picture of developmental processes, their regularities, and idiosyncrasies.
There has also been an increase in interest in studying the interaction of various developmental systems (such as physical, cognitive, emotional, and social), and an increasing emphasis on the complexity of the influences (such as biological and social) that influence development. A strong exponent of this approach, Urie Bronfenbrenner, developed an ecological model of human development, which includes an ever-widening set of influences on development (Bronfenbrenner, 1979; Bronfenbrenner & Morris, 2006). While we do not specifically deal with the ecological approach in this book, it is worth your while to read up on it. Nevertheless, we do emphasise throughout the need to put development in its full context, which includes cultural and socioeconomic contexts.
While observation of human behaviour began with early philosophers such as Aristotle, St Augustine, and Jean-Jacques Rousseau, dramatists such as Shakespeare, and scientists such as Charles Darwin, careful scientific observation of human nature from which emerged great theories of human development began in the early 1900s (see, Hergenhahn & Henley, 2014). Major contributions were made by people such as, Jean Piaget, Lev Vygotsky, and Alexander Luria in the development of cognition; John Watson, Edward Thorndike, and Burrhus Skinner, in behavioural development; William James, Granville Hall, Sigmund Freud, and Carl Jung in self and personality development; Alfred Binet and James Cattell on mental testing; and Arnold Gesell on physical development. From this early systematic theorising and observational, clinical, and experimental research emerged a body of knowledge that forms the core of developmental psychology (and other branches of psychology) and from which emerged the contemporary scientific study of child and adolescent development.
Throughout the study of psychology, various research approaches have fallen in and out of favour. Many early studies were based on the clinical method. By the clinical method we mean a procedure whereby a psychologist probes for information by asking a respondent questions in an interview setting, and supplementing the information obtained in this manner with observations, projective techniques (such as interpreting pictures), and perhaps some activities (such as completing a relevant task). The clinical method formed the basis of the research of a whole host of early masters such as Piaget and Freud.
However, other psychologists considered such approaches too subjective, open to interpretation, and relatively non-scientific. These researchers preferred a scientific method based on controlled experiments in which cause and effect could be examined. Experimental approaches formed a major component of the research techniques of some early giants of psychology such as Watson, Thorndike, and Skinner.
Whether research is clinical or experimental, good research is based on theory and hypothesis testing. In other words, researchers attempt to answer questions related to development such as āare there critical times for the development of speech?ā, āis bonding with parents essential for the emotional health of children?ā, ādoes cognitive development proceed in stages?ā, and ādoes viewing violent television make children more violent?ā. Theories, hypotheses, and research questions are essential as they drive the investigative process, and from well-designed studies is generated the information upon which psychologists, teachers, nurses, psychiatrists, and other professionals make informed judgements.
There is no right way to study child development; both the clinical metho...