Imitative Behaviours Research Articles

Julia Wedgwood and the origin of language

ABSTRACT This article provides the first detailed modern examination of Julia Wedgwood’s interventions in the Victorian debate about the origin of language. Wedgwood wanted to understand language, consistently with Darwin’s theory of evolution, as having evolved gradually out of other forms of animal behaviour. She focused specifically on imitative behaviours, siding with the imitative or “bow-wow” theory of language which her father Hensleigh Wedgwood also championed. She opposed the conceptualist or “ding-dong” theory of Max Müller, on which language is the “Rubicon” that radically separates humans from animals. I argue that Julia Wedgwood was right to emphasise that the human capacity for language is continuous with animal behaviours, though she was wrong to reduce this continuity to a single behaviour, imitation. Nevertheless, her language essays remain significant as an early attempt to forge a Darwinian account of language, and they illuminate the fact that women were able to take part in Victorian philosophical debates, including on an abstract topic such as philosophy of language. The essays also provide entry into Wedgwood’s thought and work more broadly, which are unjustly neglected and deserve to be recovered.

Evolutionary matrix-game dynamics under imitation in heterogeneous populations

Perpetual fluctuations between decisions are reported as the dominant asymptotic outcome of imitative behaviours, yet little attempt has been made to characterize them, particularly in heterogeneous populations. We study a finite well-mixed heterogeneous population of individuals choosing between the two strategies, cooperation and defection, and earning based on their payoff matrices that can be unique to each individual. At each time step, an arbitrary individual becomes active to update her decision by imitating the highest earner in the population. We show that almost surely the dynamics reach either an equilibrium state or a non-singleton minimal positively invariant set, a fluctuation set, in the long run. In addition to finding all equilibria, we characterize the fluctuation sets, provide necessary conditions and sufficient conditions for their existence, and approximate their basins of attraction. Our results theoretically explain earlier reported simulation results and shed new light on the boundedly rational nature of imitation behaviours.

Early motor copying behaviours: analysis of their functions and relationship with language

ABSTRACT The development of copying behaviours of a group of infants from 9 to 15 months of age is analysed. These behaviours are classified according to their type (mimetic or imitated) and function (instrumental, social or hybrid). The function of the behaviours is derived from observable indicators linked to dyadic interaction. Mimetic behaviours are maintained from 9 to 15 months, while imitative behaviours increase in frequency. The elicited copying situation promotes more behaviours with instrumental function, while other functions appear spontaneously. The concurrent and prospective relationships between copying behaviours – frequency, type and function- and receptive and expressive language are different through development. This study proposes an innovative definition of the functions of copying behaviours that is based on dynamic variables linked to interaction, in contrast to previous work that derives function from static variables such as context, object use and/or the body part performing the movement.

Celebrity role models and their impact on mental health of children and adolescents: Implications and suggestions

In tandem with increased exposure of children and adolescents to the media during current digital age, it is also increasingly important to discuss about the influence of celebrity role models on this group. Glorified media portrayals of celebrity lifestyles and their choices may have a knock-on effect on mental health and trigger imitative behaviours by children and adolescents. In this report, we examine the impact of negative celebrity role models on young children and propose some recommendations, both from a public health as well as individual standpoint, to help mitigate this impact and, instead, promote healthy role modelling.

Dual-route imitation in preschool children

Imitation can be realized via two different routes: a direct route that translates visual input into motor output when gestures are meaningless or unknown, and a semantic route for known/meaningful gestures. Young infants show imitative behaviours compatible with the direct route, but little is known about the development of the semantic route, studied here for the first time. The present study examined preschool children (3–5years of age) imitating gestures that could be transitive or intransitive, and meaningful or meaningless. Both routes for imitation were already present by three years of age, and children were more accurate at imitating meaningful-intransitive gestures than meaningless-intransitive ones; the reverse pattern was found for transitive gestures. Children preferred to use their dominant hand even if they had to anatomically imitate the model to do this, showing that a preference for specular imitation is not exclusive at these ages.

„Ludzki mózg jest potężną imitującą maszyną”. Teoria mimetyczna a badania nad naturą imitacji w naukach kognitywnych

This article attempts to trace the relationship between Rene Girard’s mimetic theory and research on the nature of imitation in cognitive sciences. It is divided into four parts. The first one defines the basic concept of the French thinker’s theory, i.e. that of mimetic desire, in the context of such notions as biological, cultural and psychological mimicry. The second refers to the research conducted in the area of developmental psychology on mimetic behaviours of infants. The third part shows how imitative behaviours are reflected in the activity of neurons. The fourth chapter describes the most recent findings, which directly relate to the theory of Rene Girard’s mimetic desire.

Optimality, reduction and collective motion.

The planar self-steering particle model of agents in a collective gives rise to dynamics on the N-fold direct product of SE(2), the rigid motion group in the plane. Assuming a connected, undirected graph of interaction between agents, we pose a family of symmetric optimal control problems with a coupling parameter capturing the strength of interactions. The Hamiltonian system associated with the necessary conditions for optimality is reducible to a Lie-Poisson dynamical system possessing interesting structure. In particular, the strong coupling limit reveals additional (hidden) symmetry, beyond the manifest one used in reduction: this enables explicit integration of the dynamics, and demonstrates the presence of a 'master clock' that governs all agents to steer identically. For finite coupling strength, we show that special solutions exist with steering controls proportional across the collective. These results suggest that optimality principles may provide a framework for understanding imitative behaviours observed in certain animal aggregations.

Is a good example the best sermon? Children’s imitation of parental reading

We use the last two waves of the Italian Time Use Survey to analyse whether children imitate the reading habits of their parents. As reading is crucial for continuous investment in human capital throughout a person’s life, it is important that children acquire the habit of reading. This habit may be developed through both cultural and educational transfers from parents to children, and through imitative behaviours. Imitation is of particular interest, as it suggests that parents can have a direct influence on the formation of their children’s preferences and habits, and that active policies promoting good parenting behaviours might therefore be desirable. We investigate the short-run imitative behaviour of children using a household fixed-effects model in which we identify the impact of the parents’ role model by exploiting the differences in the exposure of siblings to their parents’ example within the same household. We find robust evidence of the existence of an imitation effect: on the day of the survey, children were more likely to had read after seeing either their mother or their father reading.

Cross-cultural perspectives on music and musicality.

Musical behaviours are universal across human populations and, at the same time, highly diverse in their structures, roles and cultural interpretations. Although laboratory studies of isolated listeners and music-makers have yielded important insights into sensorimotor and cognitive skills and their neural underpinnings, they have revealed little about the broader significance of music for individuals, peer groups and communities. This review presents a sampling of musical forms and coordinated musical activity across cultures, with the aim of highlighting key similarities and differences. The focus is on scholarly and everyday ideas about music--what it is and where it originates--as well the antiquity of music and the contribution of musical behaviour to ritual activity, social organization, caregiving and group cohesion. Synchronous arousal, action synchrony and imitative behaviours are among the means by which music facilitates social bonding. The commonalities and differences in musical forms and functions across cultures suggest new directions for ethnomusicology, music cognition and neuroscience, and a pivot away from the predominant scientific focus on instrumental music in the Western European tradition.

Brain representation of action observation in human infants.

Imitative learning has long been established as extremely important for early development. However, neural mechanisms involved in early imitative behaviours are still areas of active research. Neurophysiological and brain-imaging studies have been recently performed that provide initial evidence of brain activation associated with action observation in the first months of life. In this review we examine all studies exploring the effects of action observation on brain function assessed by means of non-invasive brain-mapping techniques. Seventeen papers were selected as a result of our literature search. The strongest evidence for a neural signature of action observation comes from studies exploring the desynchronization of the μ-rhythm, which was reported for both occluded and visible goal-directed grasp, and was correlated with the totality of the infant's own action experience. The effects of action observation were reported on event-related potentials (ERPs) or near infrared spectroscopy. Taken together, these studies suggest that, in early infancy, a direct visual-motor matching process is already detectable as early as 6months, suggesting a matching between action perception and execution already in infancy. If confirmed by future studies, these findings will shed light on the mechanisms of early motor development and imitation, and will be key to informing novel rehabilitation strategies in infants with congenital brain damage.

Análise de integração e contágio financeiro na América do Sul

Este artigo agrega a discussao promovida em Mejia-Reyes (2000) e Hecq (2001) sobre integracao e contagio financeiro nos paises da America do Sul, atraves da modelagem de caracteristicas comuns no longo e no curto prazo das trajetorias de evolucao dos indices das principais bolsas de valores. Apesar da diversidade nos fundamentos macroeconomicos deste continente, os resultados sugerem os sistemas financeiros destes paises nao devam ser analisados individualmente, pois os desvios do equilibrio de longo prazo em qualquer um dos mercados financeiros sao capazes de influenciar os demais mercados em questao, durante o periodo de janeiro de 1998 e novembro de 2010. Alinhado a D'ecclesia e Costantini (2006), as evidencias no curto prazo sinalizam a presenca de contagio financeiro, mais evidente em razao de eventos extremos globais, positivos ou negativos, capazes de provocar oscilacoes de curto prazo mais acentuadas e em direcoes comuns, seguindo uma trajetoria em que se destaca o indice peruano, cujo ciclo, imprevisivel, e o unico capaz de prever o ciclo comum e os demais ciclos individuais.

Propensity to imitate in autism is not modulated by the model's gaze direction: an eye-tracking study.

Individuals with Autism Spectrum Disorder (ASD) show a diminished propensity to imitate others' actions, as well as a diminished sensitivity and responsivity to others' communicative cues, such as a direct gaze. However, it is not known whether failure to appreciate the communicative value of a direct gaze is associated with imitation abnormalities in this population. In this eye-tracking study, we investigated how 25 preschoolers with ASD, compared with 25 developmental and chronological age-matched children, imitate actions that are associated with a model's direct gaze versus averted gaze. We found that the model's direct gaze immediately prior to the demonstration increased the attention to the model and the propensity to imitate the demonstrated action in children without ASD. In contrast, preschoolers with ASD showed a similar propensity to look at the model's face and to imitate the demonstrated actions across the direct gaze and the averted gaze conditions. These data indicate that atypical imitation in ASD might be linked to abnormal processing of the model's communicative signals (such as a direct gaze) that modulate imitative behaviours in individuals without ASD. Autism Res 2014, 7: 392-399. © 2014 International Society for Autism Research, Wiley Periodicals, Inc.

Learning by observation in children with autism spectrum disorder

Observing another person performing a complex action accelerates the observer's acquisition of the same action and limits the time-consuming process of learning by trial and error. Learning by observation requires specific skills such as attending, imitating and understanding contingencies. Individuals with autism spectrum disorder (ASD) exhibit deficits in these skills. The performance of 20 ASD children was compared with that of a group of typically developing (TD) children matched for chronological age (CA), IQ and gender on tasks of learning of a visuomotor sequence by observation or by trial and error. Acquiring the correct sequence involved three phases: a detection phase (DP), in which participants discovered the correct sequence and learned how to perform the task; an exercise phase (EP), in which they reproduced the sequence until performance was error free; and an automatization phase (AP), in which by repeating the error-free sequence they became accurate and speedy. In the DP, ASD children were impaired in detecting a sequence by trial and error only when the task was proposed as first, whereas they were as efficient as TD children in detecting a sequence by observation. In the EP, ASD children were as efficient as TD children. In the AP, ASD children were impaired in automatizing the sequence. Although the positive effect of learning by observation was evident, ASD children made a high number of imitative errors, indicating marked tendencies to hyperimitate. These findings demonstrate the imitative abilities of ASD children although the presence of imitative errors indicates an impairment in the control of imitative behaviours.

The Werther Effect of Two Celebrity Suicides: an Entertainer and a Politician

PurposeSuicide is a major health problem in Korea. Extensive media exposure of celebrity suicide may induce imitative suicide, a phenomenon called the Werther effect. We examined the increased suicide risk following the suicides of an entertainer and a politician, and identified the relative suicide risks. MethodsNews articles about the celebrity suicides were obtained from three major newspapers and analysed for quantitative and qualitative features. Imitative suicide risk was investigated by applying a Poisson time series autoregression model with suicide mortality data from the National Statistics Office for 1.5 years before and 1.5 years after each celebrity’s suicide. The period with a significantly increased number of suicides immediately after the celebrity’s suicide determined the Werther effect band. The relative risk during this period was examined for different ages, genders, and suicide methods.ResultsNews reports were more numerous and they contained more positive definitions about the entertainer’s suicide. The risk of suicide deaths rose markedly after both celebrity suicides. However, the Werther effect band was longer for the entertainer (6 weeks) than for the politician (4 weeks). The relative suicide risk was significant for almost all ages and both genders during that of both individuals. Use of the same suicide method was a prominent risk factor after both celebrity suicides. ConclusionsOur results confirm the existence of imitative suicide behaviours, suggesting a facilitation effect of media reports. Guidelines for responsible media reporting need to be implemented to enhance public mental health in Korea.

Media recommendations on reporting suicidal behaviour and suggestions for optimisation

Media recommendations on reporting suicidal behaviour and suggestions for optimisation

Interference Effect of Body Shadow in Action Control

Observing actions performed by other persons can subsequently influence our own motor behaviours. However, it is unknown whether the shadows cast by such actions can also have an impact on the observers' actions. Here we show that the mere observation of a cast shadow can influence imitative behaviours. Specifically, participants were shown a hand picture and its associated cast shadow in a neutral position. In a 'compatible trial' the hand and the shadow that followed were turned in the same open or closed direction, whereas in an 'incompatible trial' the hand and the shadow were turned in different directions. We contrasted two experimental conditions: (i) 'hand-shadow' in which participants observed a hand and its cast shadow (the hand covered the shadow); (ii) 'hand-hand' in which participants observed a hand and another black hand (the shadow covered the hand). The participants' task was to imitate (ie by closing or opening their own hands) the hand or the cast shadow of an action. For both conditions results revealed interference (ie longer response latencies) for incompatible trials. This suggests for the first time that the mere observation of a cast shadow of a hand can influence imitative behaviours. However, time courses of the response latencies revealed that imitative effect in the hand-shadow condition was different than the imitative effect in the hand-hand condition. Therefore, we suggest considering the cast shadow of an action as an important feature during motor control for humans.

Unintentional paediatric ingestion poisonings and the role of imitative behaviour

ObjectiveTo quantify the relationship between imitative behaviour and poisonings in children.SettingUSA.MethodsThis study is based on the evaluation of a large national database of unintentional oral ingestion poisonings involving children aged...

From monkey mirror neurons to primate behaviours: possible ‘direct’ and ‘indirect’ pathways

The discovery of mirror neurons (MNs), deemed to be at the basis of action understanding, could constitute the potential solution to the 'correspondence problem' between one's own and others' action that is crucial for of imitative behaviours. However, it is still to be clarified whether, and how, several imitative phenomena, differing in terms of complexity and cognitive effort, could be explained within a unified framework based on MNs. Here we propose that MNs could differently contribute to distinct imitative behaviours by means of two anatomo-functional pathways, subjected to changes during development. A 'direct mirror pathway', directly influencing the descending motor output, would be responsible for neonatal and automatic imitation. This proposal is corroborated by some new behavioural evidences provided here. During development, the increased control of voluntary movements and the capacity to efficiently suppress automatic motor activation during action observation assign to the core MNs regions essentially perceptuo-cognitive functions. These functions would be exploited by an 'indirect mirror pathway' from the core regions of the MN system to prefrontal cortex. This latter would play a key role in parsing, storing and organizing motor representations, allowing the emergence of more efficient and complex imitative behaviours such as response facilitation and true imitation.

A cognitive approach to goal-level imitation

Imitation in robotics is seen as a powerful means to reduce the complexity of robot programming. It allows users to instruct robots by simply showing them how to execute a given task. Through imitation robots can learn from their environment and adapt to it just as human newborns do. Despite different facets of imitative behaviours observed in humans and higher primates, imitation in robotics has usually been implemented as a process of copying demonstrated actions onto the movement apparatus of the robot. While the results being reached are impressive, we believe that a shift towards a higher expression of imitation, namely the comprehension of human actions and inference of its intentions, is needed. In order to be useful as human companions, robots must act for a purpose by achieving goals and fulfilling human expectations. In this paper we present ConSCIS (Conceptual Space based Cognitive Imitation System), an architecture for goal-level imitation in robotics where the focus is put on final effects of actions on objects. The architecture tightly links low-level data with high-level knowledge, and integrates, in a unified framework, several aspects of imitation, such as perception, learning, knowledge representation, action generation and robot control. Some preliminary experimental results with an anthropomorphic arm/hand robotic system are shown.

Children with autism are more imitative with an imitative adult than with their parents

Children with autism (mean age = 6 years) were videotaped first interacting with a parent and then with an unfamiliar researcher who imitated the child’s behaviours. The researcher showed more imitative and playful behaviours than the parents. In turn, the children showed more imitative behaviour when playing with the imitative researcher than with their parents.