Imitation of televised models by infants

Studies indicate that infants in our culture are exposed to significant amounts of TV, often as a baby-sitting strategy by busy caretakers. The question arises whether TV viewing merely presents infants with a salient collection of moving patterns or whether they will readily pick up information depicted in this 2-D representation and incorporate it into their own behavior. Can infants "understand" the content of television enough to govern their real-world behavior accordingly? One way to explore this question is to present a model via television for infants to imitate. Infants' ability to imitate TV models was explored at 2 ages, 14 and 24 months, under conditions of immediate and deferred imitation. In deferred imitation, infants were exposed to a TV depiction of an adult manipulating a novel toy in a particular way but were not presented with the real toy until the next day. The results showed significant imitation at both ages, and furthermore showed that even the youngest group imitated after the 24-hour delay. The finding of deferred imitation of TV models has social and policy implications, because it suggests that TV viewing in the home could potentially affect infant behavior and development more than heretofore contemplated. The results also add to a growing body of literature on prelinguistic representational capacities. They do so in the dual sense of showing that infants can relate 2-D representations to their own actions on real objects in 3-D space, and moreover that the information picked up through TV can be internally represented over lengthy delays before it is used to guide the real-world action.     

Developmental Changes in Imitation from Television during Infancy

Infants' (N = 276) ability to learn from television under seminaturalistic conditions was examined in five experiments with 12-, 15-, and 18-month-olds. In all experiments, an adult performed a series of specific actions with novel stimuli. Some infants watched the demonstration live, and some infants watched the same demonstration on television from prerecorded videotape. Infants' ability to reproduce the target actions was then assessed either immediately or after a 24-hour delay. Infants of all ages exhibited imitation when the actions were modeled live. There were age-related and task-related differences, however, in infants' ability to imitate the same actions modeled on television. The role of perceptual, attentional, and cognitive development in the ability to learn from television is discussed.     

Imitative Learning of Actions on Objects by Children, Chimpanzees, and Enculturated Chimpanzees

In this study we compared the abilities of chimpanzees and human children to imitatively learn novel actions on objects. Of particular interest were possible differences between chimpanzees raised mostly with conspecifics (mother-reared) and chimpanzees raised in a human-like cultural environment (enculturated). Subjects were thus 3 enculturated and 3 mother-reared chimpanzees, along with 8 18-month-old and 8 30-month-old human children. Each subject was tested over a 2-day period with 16 novel objects. The introduction of each object was preceded by a baseline period in which the subjects natural proclivities toward the object were determined. For 12 objects, a human experimenter demonstrated first a simple and then a complex novel action, instructing the subject in each case to "Do what I do" (chimpanzees were prepared for the task behaviorally as well). For the other 4 objects, demonstration of a single action took place on the first day and the subjects opportunity to imitate was delayed until the second day, 48 hours later. Actions that a subject produced in baseline were excluded from further analysis. For each analyzed action, the subject's behavior was scored as to whether it successfully reproduced (1) the end result of the demonstrated action, and (2) the behavioral means used by the demonstrator. Results showed that in immediate imitation the mother-reared chimpanzees were much poorer imitators than the enculturated chimpanzees and the human children, who did not differ from one another. Surprisingly, on the delay trials, the enculturated chimpanzees significantly outperformed the other 3 groups. We conclude from these results that a human-like sociocultural environment is an essential component in the development of human-like social-cognitive and imitative learning skills for chimpanzees, and perhaps for human beings as well.     

The effect of prior practice on memory reactivation and generalization

Three experiments examined the effect of practice on memory performance by 18-month-old infants. Infants were tested using an imitation paradigm; an adult demonstrated a series of actions with objects and infants were given the opportunity to reproduce those actions following a delay. Some infants practiced the target actions before the retention interval (practice) and some did not (no practice). In Experiment 1, a reminder treatment alleviated forgetting by infants who practiced but failed to alleviate forgetting by infants who did not practice. In Experiments 2A and 2B, infants who practiced generalized to novel test stimuli after a 24-hr delay, whereas infants without practice did not. Results suggest practice influences the accessibility and generality of infants' memories.     

The role of sensory preconditioning in memory retrieval by preverbal infants

Infants’ memories are highly specific to their training stimuli; they rarely transfer learned responding. In two experiments, we asked whether sensory preconditioning facilitates the transfer of deferred imitation. In Experiments 1A and 1B, 6-month-olds were simultaneously preexposed to Puppets A and B and then saw target actions modeled on Puppet A. The infants associated the paired puppets and imitated the actions on Puppet B. In Experiment 2, the preexposure procedure was repeated, but the actions were modeled on Puppet A with a toy train in view. The infants also associated Puppet A and the train: Either object effectively reactivated both forgotten memories; thereafter, the infants again imitated the actions on Puppet B. These findings reveal that infants form specific and enduring associations between stimuli they have merely seen together. These associations facilitate the transfer of deferred imitation, both directly and indirectly, through connections to other associations.     

Attention and memory for faces and actions in infancy: the salience of actions over faces in dynamic events

Discrimination and memory for video films of women performing different activities was investigated in 5.5 month-old infants. In Experiment 1, infants (N = 24) were familiarized to the faces of one of three women performing one of three repetitive activities (blowing bubbles, brushing hair, and brushing teeth). Overall, results indicated discrimination and memory for the actions but not the faces after both a 1-min and a 7-week delay. Memory was demonstrated by a visual preference for the novel actions after the 1-min delay and for the familiar actions after the 7-week delay, replicating prior findings that preferences shift as a function of retention time. Experiment 2 (N = 12) demonstrated discrimination and memory for the faces when infants were presented in static poses at the 1-min delay, but not the 7-week delay. In Experiment 3 (N = 18), discrimination of the actions was replicated, but no discrimination among the objects embedded in the actions (hairbrush, bubble wand, toothbrush) was found. These findings demonstrate the attentional salience of actions over faces in dynamic events to 5.5 month-olds. They highlight the disparity between results generated from moving versus static displays in infancy research and emphasize the importance of using dynamic events as a basis for generalizing about perception and memory for events in the real world.     

Action imitation: the early phase of infancy.

The early phase of imitation was studied in children between 6 and 18 months by means of the presentations of 22 actions. Comparison groups were used to assess spontaneous production of actions modeled for the treatment samples. Aanalyses yielded 4 clusters of actions, with 1 cluster showing age and treatment versus comparison group effects and others failing to show both these effects. An important factor affecting imitation was the presence of objects. Actions with objects were imitated more than actions without objects. Measures of attention were found to correlate with imitation level, wheras latency was inversely related to imitation. The presence of sound as a variable that potentially influences imitation was studied, but results were inconclusive. Moreover, imitation and object concept performance were unrelated when the factor of age was controlled.     

The Role of Semantic Context and Memory in the Acquisition of Novel Nouns

Three studies assessed the ability of 2-year-olds to use semantic context to infer the meanings of novel nouns and to retain those meanings a day later. In the first experiment, 24 2-year-olds heard novel nouns in sentences that contained semantically constraining verbs (e.g., "Mommy feeds the ferret"). They chose from a set of four novel object pictures to indicate the referent. Children learned a majority of the novel words. However, they occasionally failed to choose the correct object even when they understood the verb. Experiment 2 examined whether this was due to an inability to identify some of the pictures of novel objects. Experiment 3 tested 24 2-year-olds' memory for the newly learned nouns following a 24 hr delay and found significant retention. Results are discussed in terms of learning mechanisms that facilitate vocabulary acquisition in young children.     

Increasing Steps in Recall of Events: Factors Facilitating Immediate and Long-Term Memory in 13.5- and 16.5-Month-Old Children

Children late in the second year of life show patterns of event recall similar to those of older children: (a) well-ordered immediate and delayed recall, and (b) facilitation of recall by familiarity and by enabling relations. We used elicited imitation to test whether the patterns extend to children early in the second year. In Experiment 1, 13.5- and 16.5-month-olds accurately recalled familiar and novel 2-act sequences immediately and after a 1-week delay. For 16.5-month-olds, recall was facilitated by familiarity and by enabling relations; for 13.5-month-olds, only enabling relations facilitated recall. In Experiment 2, verbal cues were used to test immediate and 1-week delayed recall of 3-act sequences. For both ages, recall was facilitated by familiarity and by enabling relations. Experiment 3 verified that the verbal information served to cue recall of previously experienced events, not to "suggest" sequences that could be performed. Together the results demonstrate that children as young as 13 months can recall specific events after a delay. They also suggest development in sensitivity to factors that facilitate recall.     

The contributions of social learning to language acquisition

Psycholinguists have often lost sight of the functions of language in their search for structural regularities. This paper focuses on three social learning variables whose roles in language development have often been discounted. Feedback or reinforcement has been said to be unrelated to grammatical development since parents tend to reinforce the truth instead of the grammar of their children's utterances. But evidence is presented showing that feedback for the child's comprehension responses can affect production of grammatical forms. Modeling or imitation has been said to be unimportant in grammatical development because most children's utterances are novel and because the frequency of imitation appears unrelated to the rate of language growth. But evidence is presented showing how many utterances can be both imitative and novel and showing that the role of these selective imitations has not been assessed properly in many studies. Contextual constraints on language have been considered unimportant in many psycholinguistic theories. But evidence is presented showing that communicative competence is related critically to the ability to adjust utterances to contextual constraints and that the language of the young child is deficient in this regard. The educational advantages of a functional analysis of language are discussed.     

Contextual Variation and Memory Retrieval at Six Months

In 2 experiments we asked whether training in multiple contexts could eliminate context-dependent memory retrieval at 6 months as it does for adults. We found that 24-hour retention was disrupted when infants were trained in one context and tested in another but not when they were trained in multiple contexts prior to testing in a novel context (Experiment 1). After a long delay, however, training in multiple contexts did not facilitate memory retrieval in a novel context: An otherwise effective retrieval cue (the training mobile) did not alleviate forgetting 3 weeks later when it was presented in a novel context (Experiment 2). These findings demonstrate that multiple learning contexts can override the debilitating effects of an altered context on memory retrieval at 6 months, but only over the short term. The resistance of older memories to retrieval in novel contexts after long periods of disuse may be adaptive, insuring that potentially inappropriate or irrelevant memories will not be expressed.     

Promoting Prosocial Behaviours Among Preschool Children With and Without Disabilities

A multiple probe across subjects design was used to evaluate the effectiveness of an intervention program on promoting prosocial behaviours among preschool children with and without disabilities. The intervention was carried out with three integrated groups of children, each comprised of one child with a disability and two peers without disabilities, created from three mainstreamed preschool classrooms. The intervention was successful in promoting increases in positive social interactions among the children with disabilities and their peers without disabilities. For two of the three groups the children with disabilities engaged in an equal or greater percentage of positive social initiations than their peers without disabilities. Increases in positive social responses to positive social initiations were similar for children with and without disabilities. Intervention phase behavioural changes generalised to both immediate group conditions, but did not generalise to deferred classroom conditions. Variability of response to intervention across groups highlights the need to develop and implement interventions on an individualised basis. The results indicate that further research is needed regarding the promotion of deferred generalisation effects as well as understanding the effects that trainer presence may have on the generalisation of the targeted social behaviours. There is also a need for the investigation of the potential for gender‐related effects including differential activity levels, ability for sustained attention, and group composition.     

Minor phenomena and major processes of interaction with objects and peers in day care centres

The aim of this paper is to analyse the relation between interaction with objects and interaction with peers in children attending day care centres. The day care centre provides the child with an opportunity to interact with peers and for new cognitive experiences. It also provides researchers with an opportunity to study the relationships between peers and objects in the child’s cognitive construction. These two domains — peer interaction and interaction with objects — represent the two poles of a unitary system which allows the child to consolidate and acquire different kinds of knowledge. The two poles can be differently activated in the child’s cognitive construction. Their integrated study affords greater understanding of a series of behavioural phenomena which occur among peers in day care centres. Naturalistic observations on early peer interaction and object-related activities will be used to illustrate the analysis. The study of the processes involved in the child’s object- and peer-related interaction and the related behavioural phenomena can provide educational suggestions in order to ensure their actual emergence and to support their positive aspects.     

Neuropsychological Correlates of Early Symptoms of Autism

Both the medial temporal lobe and dorsolateral prefrontal cortex have been implicated in autism. In the present study, performance on two neuropsychological tasks—one tapping the medial temporal lobe and related limbic structures, and another tapping the dorsolateral prefrontal cortex—was examined in relation to performance on tasks assessing autistic symptoms in young children with autism, and developmentally matched groups of children with Down syndrome or typical development. Autistic symptoms included orienting to social stimuli, immediate and deferred motor imitation, shared attention, responses to emotional stimuli, and symbolic play. Compared with children with Down syndrome and typically developing children, children with autism performed significantly worse on both the medial temporal lobe and dorsolateral prefrontal tasks, and on tasks assessing symptoms domains. For children with autism, the severity of autistic symptoms was strongly and consistently correlated with performance on the medial temporal lobe task, but not the dorsolateral prefrontal task. The hypothesis that autism is related to dysfunction of the medial temporal lobe and related limbic structures, such as the orbital prefrontal cortex, is discussed.     

The intentionality model and language acquisition: engagement, effort, and the essential tension in development.

The purpose of the longitudinal research reported in this Monograph was to examine language acquisition in the second year of life in the context of developments in cognition, affect, and social connectedness. The theoretical focus for the research is on the agency of the child and the importance of the child's intentionality for explaining development, rather than on language as an independent object. The model of development for the research is a Model of Intentionality with two components: the engagement in a world of persons and objects that motivates acquiring a language, and the effort that is required to express and articulate increasingly discrepant and elaborate intentional state representations. The fundamental assumption in the model is that the driving force for acquiring language is in the essential tension between engagement and effort for linguistic, emotional, and physical actions of interpretation and expression. Results of lag sequential analyses are reported to show how different behaviors--words, sentences, emotional expressions, conversational interactions, and constructing thematic relations between objects in play--converged, both in the stream of children's actions in everyday events, in real time, and in developmental time between the emergence of words at about 13 months and the transition to simple sentences at about 2 years of age. Patterns of deviation from baseline rates of the different behaviors show that child emotional expression, child speech, and mother speech clearly influence each other, and the mutual influences between them are different at times of either emergence or achievement in both language and object play. The three conclusions that follow from the results of the research are that (a) expression and interpretation are the acts of performance in which language is learned, which means that performance counts for explaining language acquisition; (b) language is not an independent object but is acquired by a child in relation to other kinds of behaviors and their development; and (c) acquiring language in coordination with other behaviors in acts of expression and interpretation takes work, so that acquiring language is not easy.     

The role of experimenter-odor cues in the performance of object-memory tasks by rats

Two experiments assessed whether odors left on stimulus objects by experimenters who handle them might confound the interpretation of ostensibly visually guided object-memory tasks for rats. In Experiment 1, rats were able to discriminate the relative recency with which an experimenter touched two otherwise identical objects (intertouch interval = 4 sec), presumably on the basis of an odorintensity discrimination. However, after the rats mastered the odor discrimination with no delay between when the second of the two stimulus objects was last touched by the experimenter and when the rats were permitted to attempt the discrimination, their performance dropped to chance levels when this delay was increased to 15 sec. In Experiment 2, rats were trained in two slightly different ways to perform a delayed-nonmatching-to-sample (DNMS) task, one that involved systematic differences in the temporal order in which the experimenter handled the sample and novel stimulus objects and one that did not. There were no significant differences in the rate at which rats mastered the DNMS task with these two procedures, and the performance of rats that were trained according to the former procedure was unaffected when they were switched to the latter procedure. Moreover, rats required considerably fewer trials to master the DNMS task than the rats in Experiment 1 required to master the odor discrimination. These findings demonstrate that, under certain circumstances, rats can discriminate the relative recency with which two objects are handled by an experimenter, but that this ability contributes little to their performance of conventional object-based DNMS tasks.     

The effects of child maltreatment on language development

The separate effects of child neglect, abuse, and their interaction upon language development as measured by the Preschool Language Scale were examined in four groups of children (n = 79) in a quasi-experimental design. There were three groups of maltreated subjects, all drawn from a treatment center: an abused only group (n = 13), a neglected only group (n = 7), and an abused and neglected group (n = 31); a non-maltreated group (n = 28) was drawn from a day care center. Abuse, neglect, and their interaction were used to predict both auditory comprehension and verbal ability as separate criteria in two stepwise multiple regression equations, where the variance attributable to gender and mother's status on Aid to Dependent Children had been removed. Child neglect was found to predict significantly both auditory comprehension and verbal ability. Neither child abuse nor the interaction between abuse and neglect significantly predicted either dependent variable. These findings suggest that child neglect may be the critical type of maltreatment associated with language delay.     

The birth of words: ten-month-olds learn words through perceptual salience

A core task in language acquisition is mapping words onto objects, actions, and events. Two studies investigated how children learn to map novel labels onto novel objects. Study 1 investigated whether 10-month-olds use both perceptual and social cues to learn a word. Study 2, a control study, tested whether infants paired the label with a particular spatial location rather than to an object. Results show that 10-month-olds can learn new labels and do so by relying on the perceptual salience of an object instead of social cues provided by a speaker. This is in direct contrast to the way in which older children (12-, 18-, and 24-month-olds) learn and extend new object names.     

造型艺术中的视觉抽象

人类绘画发展从幼稚的简化阶段到具象写实,再到抽象的过程,是绘画技巧及思维发展和成熟的过程,也是绘画发展的必然结果。人们从简单模仿到写实模仿的过程一旦完成,就会进入理想化阶段,最终必然要关注内心的表达,而人的内心是主观的,任何抽象都是主观看事物结果的表达。无论绘画的形式如何,其中都隐含或具有抽象的因素,这是衡量优秀作品的重要标志。"绘画的抽象是建立在整体的归纳和简化基础上,是对客观对象主动把握。观看一个物体,就是在进行某种抽象活动,因为观看活动中包含着对物体结构特征的把握,而不仅仅是对细节不加区别的录制。而且视知觉这种抽象能力从观看一开始就发挥作用了。"视觉之所以有思维本领,就是凭借直接抽象出事物里的式样来进行思考的。     

体验式英语视听说教学理论与实践研究

学生的语言模仿能力与其非母语口语能力的提高密切相关,语言模仿需建立在对该语言的实际体验和现场观察的基础之上。通过体验提高口语能力离不开必要的语言环境、合适的模仿对象和恰当的话语内容。体验只是完成了提高学生口语能力的第一步,学生口语能力的最终提高只有通过将所获语言知识运用于新语境中才能实现。