Introduction
The behavioural analysis of child development originates from John B. Watson’s behaviourism.
Brief History
In 1948, Sidney Bijou took a position as associate professor of psychology at the University of Washington and served as director of the university’s Institute of Child Development. Under his leadership, the Institute added a child development clinic and nursery school classrooms where they conducted research that would later accumulate into the are that would be called “Behaviour Analysis of Child Development”. Skinner’s behavioural approach and Kantor’s interbehavioural approach were adopted in Bijou and Baer’s model. They created a three-stage model of development (basic, foundational, and societal). Bijou and Baer looked at these socially determined stages, as opposed to organising behaviour into change points or cusps (behavioural cusp). In the behavioural model, development is considered a behavioural change. It is dependent on the kind of stimulus and the person’s behavioural and learning function. Behaviour analysis in child development takes a mechanistic, contextual, and pragmatic approach.
From its inception, the behavioural model has focused on prediction and control of the developmental process. The model focuses on the analysis of a behaviour and then synthesizes the action to support the original behaviour. The model was changed after Richard J. Herrnstein studied the matching law of choice behaviour developed by studying of reinforcement in the natural environment. More recently, the model has focused more on behaviour over time and the way that behavioural responses become repetitive. it has become concerned with how behaviour is selected over time and forms into stable patterns of responding. A detailed history of this model was written by Pelaez. In 1995, Henry D. Schlinger, Jr. provided the first behaviour analytic text since Bijou and Baer comprehensively showed how behaviour analysis – a natural science approach to human behaviour – could be used to understand existing research in child development. In addition, the quantitative behavioural developmental model by Commons and Miller is the first behavioural theory and research to address notion similar to stage.
Research Methods
The methods used to analyse behaviour in child development are based on several types of measurements. Single-subject research with a longitudinal study follow-up is a commonly-used approach. Current research is focused on integrating single-subject designs through meta-analysis to determine the effect sizes of behavioural factors in development. Lag sequential analysis has become popular for tracking the stream of behaviour during observations. Group designs are increasingly being used. Model construction research involves latent growth modelling to determine developmental trajectories and structural equation modelling. Rasch analysis is now widely used to show sequentially within a developmental trajectory.
A recent methodological change in the behavioural analytic theory is the use of observational methods combined with lag sequential analysis can determine reinforcement in the natural setting.
Quantitative Behavioural Development
The model of hierarchical complexity is a quantitative analytic theory of development. This model offers an explanation for why certain tasks are acquired earlier than others through developmental sequences and gives an explanation of the biological, cultural, organisational, and individual principles of performance. It quantifies the order of hierarchical complexity of a task based on explicit and mathematical measurements of behaviour.
Research
Contingencies, Uncertainty, and Attachment
The behavioural model of attachment recognises the role of uncertainty in an infant and the child’s limited communication abilities. Contingent relationships are instrumental in the behaviour analytic theory, because much emphasis is put on those actions that produce parents’ responses.
The importance of contingency appears to be highlighted in other developmental theories, but the behavioural model recognises that contingency must be determined by two factors:
- The efficiency of the action; and
- That efficiency compared to other tasks that the infant might perform at that point.
Both infants and adults function in their environments by understanding these contingent relationships. Research has shown that contingent relationships lead to emotionally satisfying relationships.
Since 1961, behavioural research has shown that there is relationship between the parents’ responses to separation from the infant and outcomes of a “stranger situation.”. In a study done in 2000, six infants participated in a classic reversal design (refer to single-subject research) study that assessed infant approach rate to a stranger. If attention was based on stranger avoidance, the infant avoided the stranger. If attention was placed on infant approach, the infant approached the stranger.
Recent meta-analytic studies of this model of attachment based on contingency found a moderate effect of contingency on attachment, which increased to a large effect size when the quality of reinforcement was considered. Other research on contingency highlights its effect on the development of both pro-social and anti-social behaviour. These effects can also be furthered by training parents to become more sensitive to children’s behaviours, Meta-analytic research supports the notion that attachment is operant-based learning.
An infant’s sensitivity to contingencies can be affected by biological factors and environment changes. Studies show that being placed in erratic environments with few contingencies may cause a child to have conduct problems and may lead to depression (see Behavioural Development and Depression below). Research continues to look at the effects of learning-based attachment on moral development. Some studies have shown that erratic use of contingencies by parents early in life can produce devastating long-term effects for the child.
Motor Development
Since Watson developed the theory of behaviourism, behaviour analysts have held that motor development represents a conditioning process. This holds that crawling, climbing, and walking displayed by infants represents conditioning of biologically innate reflexes. In this case, the reflex of stepping is the respondent behaviour and these reflexes are environmentally conditioned through experience and practice. This position was criticised by maturation theorists. They believed that the stepping reflex for infants actually disappeared over time and was not “continuous”. By working with a slightly different theoretical model, while still using operant conditioning, Esther Thelen was able to show that children’s stepping reflex disappears as a function of increased physical weight. However, when infants were placed in water, that same stepping reflex returned. This offered a model for the continuity of the stepping reflex and the progressive stimulation model for behaviour analysts.
Infants deprived of physical stimulation or the opportunity to respond were found to have delayed motor development. Under conditions of extra stimulation, the motor behaviour of these children rapidly improved. Some research has shown that the use of a treadmill can be beneficial to children with motor delays including Down syndrome and cerebral palsy. Research on opportunity to respond and the building of motor development continues today.
The behavioural development model of motor activity has produced a number of techniques, including operant-based biofeedback to facilitate development with success. Some of the stimulation methods such as operant-based biofeedback have been applied as treatment to children with cerebral palsy and even spinal injury successfully. Brucker’s group demonstrated that specific operant conditioning-based biofeedback procedures can be effective in establishing more efficient use of remaining and surviving central nervous system cells after injury or after birth complications (like cerebral palsy). While such methods are not a cure and gains tend to be in the moderate range, they do show ability to enhance functioning.
Imitation and Verbal Behavior
Behaviourists have studied verbal behaviour since the 1920s. E.A. Esper (1920) studied associative models of language, which has evolved into the current language interventions of matrix training and recombinative generalisation. Skinner (1957) created a comprehensive taxonomy of language for speakers. Baer, along with Zettle and Haynes (1989), provided a developmental analysis of rule-governed behaviour for the listener. and for the listener Zettle and Hayes (1989) with Don Baer providing a developmental analysis of rule-governed behaviour. According to Skinner, language learning depends on environmental variables, which can be mastered by a child through imitation, practice, and selective reinforcement including automatic reinforcement.
B.F. Skinner was one of the first psychologists to take the role of imitation in verbal behaviour as a serious mechanism for acquisition. He identified echoic behaviour as one of his basic verbal operants, postulating that verbal behaviour was learned by an infant from a verbal community. Skinner’s account takes verbal behaviour beyond an intra-individual process to an inter-individual process. He defined verbal behaviour as “behaviour reinforced through the mediation of others”. Noam Chomsky refuted Skinner’s assumptions.
In the behavioural model, the child is prepared to contact the contingencies to “join” the listener and speaker. At the very core, verbal episodes involve the rotation of the roles as speaker and listener. These kinds of exchanges are called conversational units and have been the focus of research at Columbia’s communication disorders department.
Conversational units is a measure of socialisation because they consist of verbal interactions in which the exchange is reinforced by both the speaker and the listener. H.C. Chu (1998) demonstrated contextual conditions for inducing and expanding conversational units between children with autism and non-handicapped siblings in two separate experiments. The acquisition of conversational units and the expansion of verbal behaviour decrease incidences of physical “aggression” in the Chu study and several other reviews suggest similar effects. The joining of the listener and speaker progresses from listener speaker rotations with others as a likely precedent for the three major components of speaker-as-own listener – say so correspondence, self-talk conversational units, and naming.
Development of Self
Robert Kohelenberg and Mavis Tsai (1991) created a behaviour analytic model accounting for the development of one’s “self”. Their model proposes that verbal processes can be used to form a stable sense of who we are through behavioural processes such as stimulus control. Kohlenberg and Tsai developed functional analytic psychotherapy to treat psychopathological disorders arising from the frequent invalidations of a child’s statements such that “I” does not emerge. Other behaviour analytic models for personality disorders exist. They trace out the complex biological-environmental interaction for the development of avoidant and borderline personality disorders. They focus on Reinforcement sensitivity theory, which states that some individuals are more or less sensitive to reinforcement than others. Nelson-Grey views problematic response classes as being maintained by reinforcing consequences or through rule governance.
Socialisation
Over the last few decades, studies have supported the idea that contingent use of reinforcement and punishment over extended periods of time lead to the development of both pro-social and anti-social behaviours. However research has shown that reinforcement is more effective than punishment when teaching behaviour to a child. It has also been shown that modelling is more effective than “preaching” in developing pro-social behaviour in children. Rewards have also been closely studied in relation to the development of social behaviours in children. The building of self-control, empathy, and cooperation has all implicated rewards as a successful tactic, while sharing has been strongly linked with reinforcement.
The development of social skills in children is largely affected in that classroom setting by both teachers and peers. Reinforcement and punishment play major roles here as well. Peers frequently reinforce each other’s behaviour. One of the major areas that teachers and peers influence is sex-typed behaviour, while peers also largely influence modes of initiating interaction, and aggression. Peers are more likely to punish cross-gender play while at the same time reinforcing play specific to gender. Some studies found that teachers were more likely to reinforce dependent behaviour in females.
Behavioural principles have also been researched in emerging peer groups, focusing on status. Research shows that it takes different social skills to enter groups than it does to maintain or build one’s status in groups. Research also suggests that neglected children are the least interactive and aversive, yet remain relatively unknown in groups. Children suffering from social problems do see an improvement in social skills after behaviour therapy and behaviour modification (refer to applied behaviour analysis). Modelling has been successfully used to increase participation by shy and withdrawn children. Shaping of socially desirable behaviour through positive reinforcement seems to have some of the most positive effects in children experiencing social problems.
Anti-Social Behaviour
In the development of anti-social behaviour, aetiological models for anti-social behaviour show considerable correlation with negative reinforcement and response matching (refer to matching law). Escape conditioning, through the use of coercive behaviour, has a powerful effect on the development and use of future anti-social tactics. The use of anti-social tactics during conflicts can be negatively reinforced and eventually seen as functional for the child in moment to moment interactions. Anti-social behaviours will also develop in children when imitation is reinforced by social approval. If approval is not given by teachers or parents, it can often be given by peers. An example of this is swearing. Imitating a parent, brother, peer, or a character on TV, a child may engage in the anti-social behaviour of swearing. Upon saying it they may be reinforced by those around them which will lead to an increase in the anti-social behaviour. The role of stimulus control has also been extensively explored in the development of anti-social behaviour. Recent behavioural focus in the study of anti-social behaviour has been a focus on rule-governed behaviour. While correspondence for saying and doing has long been an interest for behaviour analysts in normal development and typical socialisation, recent conceptualisations have been built around families that actively train children in anti-social rules, as well as children who fail to develop rule control.
Developmental Depression with Origins in Childhood
Behavioural theory of depression was outlined by Charles Ferster. A later revision was provided by Peter Lewisohn and Hyman Hops. Hops continued the work on the role of negative reinforcement in maintaining depression with Anthony Biglan. Additional factors such as the role of loss of contingent relations through extinction and punishment were taken from early work of Martin Seligman. The most recent summary and conceptual revisions of the behavioural model was provided by Johnathan Kanter. The standard model is that depression has multiple paths to develop. It can be generated by five basic processes, including: lack or loss of positive reinforcement, direct positive or negative reinforcement for depressive behaviour, lack of rule-governed behaviour or too much rule-governed behaviour, and/or too much environmental punishment. For children, some of these variables could set the pattern for lifelong problems. For example, a child whose depressive behaviour functions for negative reinforcement by stopping fighting between parents could develop a lifelong pattern of depressive behaviour in the case of conflicts. Two paths that are particularly important are:
- Lack or loss of reinforcement because of missing necessary skills at a developmental cusp point; or
- The failure to develop adequate rule-governed behaviour.
For the latter, the child could develop a pattern of always choosing the short-term small immediate reward (i.e. escaping studying for a test) at the expense of the long-term larger reward (passing courses in middle school). The treatment approach that emerged from this research is called behavioural activation.
In addition, use of positive reinforcement has been shown to improve symptoms of depression in children. Reinforcement has also been shown to improve the self-concept in children with depression comorbid with learning difficulties. Rawson and Tabb (1993) used reinforcement with 99 students (90 males and 9 females) aged from 8 to 12 with behaviour disorders in a residential treatment program and showed significant reduction in depression symptoms compared to the control group.
Cognitive Behaviour
As children get older, direct control of contingencies is modified by the presence of rule-governed behaviour. Rules serve as an establishing operation and set a motivational stage as well as a discrimintative stage for behaviour. While the size of the effects on intellectual development are less clear, it appears that stimulation does have a facilitative effect on intellectual ability. However, it is important to be sure not to confuse the enhancing effect with the initial causal effect. Some data exists to show that children with developmental delays take more learning trials to acquire in material.
Learned Units and Developmental Retardation
Behaviour analysts have spent considerable time measuring learning in both the classroom and at home. In these settings, the role of a lack of stimulation has often been evidenced in the development of mild and moderate mental retardation. Recent work has focused on a model of “developmental retardation,”. an area that emphasizes cumulative environmental effects and their role in developmental delays. To measure these developmental delays, subjects are given the opportunity to respond, defined as the instructional antecedent, and success is signified by the appropriate response and/or fluency in responses. Consequently, the learned unit is identified by the opportunity to respond in addition to given reinforcement.
One study employed this model by comparing students’ time of instruction was in affluent schools to time of instruction in lower income schools. Results showed that lower income schools displayed approximately 15 minutes less instruction than more affluent schools due to disruptions in classroom management and behaviour management. Altogether, these disruptions culminated into two years worth of lost instructional time by grade 10. The goal of behaviour analytic research is to provide methods for reducing the overall number of children who fall into the retardation range of development by behavioural engineering.
Hart and Risely (1995, 1999) have completed extensive research on this topic as well. These researchers measured the rates of parent communication with children of the ages of 2-4 years and correlated this information with the IQ scores of the children at age 9. Their analyses revealed that higher parental communication with younger children was positively correlated with higher IQ in older children, even after controlling for race, class, and socio-economic status. Additionally, they concluded a significant change in IQ scores required intervention with at-risk children for approximately 40 hours per week.
The formation of class-like behaviour has also been a significant aspect in the behavioural analysis of development. This research has provided multiple explanations to the development and formation of class-like behaviour, including primary stimulus generalisation, an analysis of abstraction, relational frame theory, stimulus class analysis (sometimes referred to as recombinative generalisation), stimulus equivalence, and response class analysis. Multiple processes for class-like formation provide behaviour analysts with relatively pragmatic explanations for common issues of novelty and generalisation.
Responses are organised based upon the particular form needed to fit the current environmental challenges as well as the functional consequences. An example of large response classes lies in contingency adduction, which is an area that needs much further research, especially with a focus on how large classes of concepts shift. For example, as Piaget observed, individuals have a tendency at the pre-operational stage to have limits in their ability to preserve information. While children’s training in the development of conservation skills has been generally successful, complications have been noted. Behaviour analysts argue that this is largely due to the number of tool skills that need to be developed and integrated. Contingency adduction offers a process by which such skills can be synthesized and which shows why it deserves further attention, particularly by early childhood interventionists.
Autism
Ferster (1961) was the first researcher to posit a behaviour analytic theory for autism. Ferster’s model saw autism as a by-product of social interactions between parent and child. Ferster presented an analysis of how a variety of contingencies of reinforcement between parent and child during early childhood might establish and strengthen a repertoire of behaviours typically seen in children diagnosed with autism. A similar model was proposed by Drash and Tutor (1993), who developed the contingency-shaped or behavioural incompatibility theory of autism. They identified at least six reinforcement paradigms that may contribute to significant deficiencies in verbal behaviour typically characteristic of children diagnosed as autistic. They proposed that each of these paradigms may also create a repertoire of avoidance responses that could contribute to the establishment of a repertoire of behaviour that would be incompatible with the acquisition of age-appropriate verbal behaviour. More recent models attribute autism to neurological and sensory models that are overly worked and subsequently produce the autistic repertoire. Lovaas and Smith (1989) proposed that children with autism have a mismatch between their nervous systems and the environment, while Bijou and Ghezzi (1999) proposed a behavioural interference theory. However, both the environmental mismatch model and the inference model were recently reviewed, and new evidence shows support for the notion that the development of autistic behaviours are due to escape and avoidance of certain types of sensory stimuli. However, most behavioural models of autism remain largely speculative due to limited research efforts.
Role in Education
One of the largest impacts of behaviour analysis of child development is its role in the field of education. In 1968, Siegfried Englemann used operant conditioning techniques in a combination with rule learning to produce the direct instruction curriculum. In addition, Fred S. Keller used similar techniques to develop programmed instruction. B.F. Skinner developed a programmed instruction curriculum for teaching handwriting. One of Skinner’s students, Ogden Lindsley, developed a standardized semilogrithmic chart, the “Standard Behaviour Chart,” now “Standard Celeration Chart,” used to record frequencies of behaviour, and to allow direct visual comparisons of both frequencies and changes in those frequencies (termed “celeration”). The use of this charting tool for analysis of instructional effects or other environmental variables through the direct measurement of learner performance has become known as precision teaching.
Behaviour analysts with a focus on behavioural development form the basis of a movement called positive behaviour support (PBS). PBS has focused on building safe schools.
In education, there are many different kinds of learning that are implemented to improve skills needed for interactions later in life. Examples of this differential learning include social and language skills. According to the NWREL (Northwest Regional Educational Laboratory), too much interaction with technology will hinder a child’s social interactions with others due to its potential to become an addiction and subsequently lead to anti-social behaviour. In terms of language development, children will start to learn and know about 5-20 different words by 18 months old.
Critiques of Behavioural Approach and New Developments
Behaviour analytic theories have been criticized for their focus on the explanation of the acquisition of relatively simple behaviour (i.e. the behaviour of nonhuman species, of infants, and of individuals who are intellectually disabled or autistic) rather than of complex behaviour. Michael Commons continued behaviour analysis’s rejection of mentalism and the substitution of a task analysis of the particular skills to be learned. In his new model, Commons has created a behaviour analytic model of more complex behaviour in line with more contemporary quantitative behaviour analytic models called the model of hierarchical complexity. Commons constructed the model of hierarchical complexity of tasks and their corresponding stages of performance using just three main axioms.
In the study of development, recent work has been generated regarding the combination of behaviour analytic views with dynamical systems theory. The added benefit of this approach is its portrayal of how small patterns of changes in behaviour in terms of principles and mechanisms over time can produce substantial changes in development.
Current research in behaviour analysis attempts to extend the patterns learned in childhood and to determine their impact on adult development.
Professional Organisations
The Association for Behaviour Analysis International has a special interest group for the behaviour analysis of child development.
Doctoral level behaviour analysts who are psychologists belong to American Psychological Association’s division 25: behaviour analysis.
The World Association for Behaviour Analysis has a certification in behaviour therapy. The exam draws questions on behavioural theories of child development as well as behavioural theories of child psychopathology.
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