Imitation

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This article is about the behavior in humans and animals. For other uses, see Imitation (disambiguation).
A newborn rhesus macaque imitates tongue protrusion.

Imitation is an advanced behavior whereby an individual observes and replicates another's behavior. Imitation is also a form of social learning that leads to the "development of traditions, and ultimately our culture. It allows for the transfer of information (behaviours, customs, etc.) between individuals and down generations without the need for genetic inheritance."[1] The word imitation can be applied in many contexts, ranging from animal training to international politics.[2]

Anthropology and social sciences

In anthropology, some theories hold that all cultures imitate ideas from one or a few original cultures, the Adam of the Bible, or several cultures whose influence overlaps geographically. Evolutionary diffusion theory holds that cultures influence one another, but that similar ideas can be developed in isolation.

Scholars[3] as well as popular authors[4][5] have argued that the role of imitation in humans is unique among animals. Psychologist Kenneth Kaye showed[6][7] that infants' ability to match the sounds or gestures of an adult depends on an interactive process of turn-taking over many successive trials, in which adults' instinctive behavior plays as great a role as that of the infant. These writers assume that evolution would have selected imitative abilities as fit because those who were good at it had a wider arsenal of learned behavior at their disposal, including tool-making and language.

In the mid-20th century, social scientists began to study how and why people imitate ideas. Everett Rogers pioneered innovation diffusion studies, identifying factors in adoption and profiles of adopters of ideas.[citation needed]

Neuroscience

We are capable of imitating movements, actions, skills, behaviors, gestures, pantomimes, mimics, vocalizations, sounds, speech, etc. and that we have particular "imitation systems" in the brain is old neurological knowledge dating back to Hugo Karl Liepmann. Liepmann's model 1908 "Das hierarchische Modell der Handlungsplanung" (the hierarchical model of action planning) is still valid. On studying the cerebral localization of function, Liepmann postulated that planned or commanded actions were prepared in the parietal lobe of the brain's dominant hemisphere, and also frontally. His most important pioneering work is when extensively studying patients with lesions in these brain areas, he discovered that the patients lost (among other things) the ability to imitate. He was the one who coined the term "apraxia" and differentiated between ideational and ideomotor apraxia. In this basic and wider frame of classical neurological knowledge the discovery of the mirror neuron has to be seen. Though mirror neurons were first discovered in macaques, their discovery also relates to humans.[citation needed]

FMRI human brain studies revealed a network of regions in the inferior frontal cortex and inferior parietal cortex which are typically activated during imitation tasks.[8] It has been suggested that these regions contain mirror neurons similar to the mirror neurons recorded in the macaque monkey.[9] However, it is not clear if macaques spontaneously imitate each other in the wild.

Neurologist V.S. Ramachandran argues that the evolution of mirror neurons were important in the human acquisition of complex skills such as language and believes the discovery of mirror neurons to be a most important advance in neuroscience.[10] However, little evidence directly supports the theory that mirror neuron activity is involved in cognitive functions such as empathy or learning by imitation.[11]

Evidence is accumulating that bottlenose dolphins employ imitation to learn hunting and other skills from other dolphins.[12][13]

Japanese monkeys have been seen to spontaneously begin washing potatoes after seeing humans washing them.[citation needed].

Mirror Neuron System

Research has been conducted to locate where in the brain specific parts and neurological systems are activated when humans imitate behaviors and actions of others, discovering a mirror neuron system. This neuron system allows a person to observe and then recreate the actions of others. Mirror neurons are premotor and parietal cells in the macaque brain that fire when the animal performs a goal directed action and when it sees others performing the same action."[14] Evidence suggests that the mirror neuron system also allows people to comprehend and understand the intentions and emotions of others [citation needed]. Problems of the mirror neuron system may be correlated with the social inadequacies of autism. There have been many studies done showing that children with autism, compared with typically developing children, demonstrate reduced activity in the frontal mirror neuron system area when observing or imitating facial emotional expressions. Of course, the higher the severity of the disease, the lower the activity in the mirror neuron system is.[14]

Animal behavior

Scientists debate whether animals can truly imitate novel actions or whether imitation is uniquely human.[15] The current controversy is partly definitional. Thorndike uses "learning to do an act from seeing it done."[16] It has two major shortcomings: first, by using "seeing" it restricts imitation to the visual domain and excludes, e.g., vocal imitation and, second, it would also include mechanisms such as priming, contagious behavior and social facilitation,[17] which most scientist distinguish as separate forms of observational learning. Thorpe suggested defining imitation as "the copying of a novel or otherwise improbable act or utterance, or some act for which there is clearly no instinctive tendency."[18] This definition is favored by many scholars, though questions have been raised how strictly the term "novel" has to be interpreted and how exactly a performed act has to match the demonstration to count as a copy.

In 1952 Hayes & Hayes[19] used the "do-as-I-do" procedure to demonstrate the imitative abilities of their trained chimpanzee "Viki." Their study was repeatedly criticized for its subjective interpretations of their subjects' responses. Replications of this study[20] found much lower matching degrees between subjects and models. However, imitation research focusing on the copying fidelity got new momentum from a study by Voelkl and Huber.[21] They analyzed the motion trajectories of both model and observer monkeys and found a high matching degree in their movement patterns.

Paralleling these studies, comparative psychologists provided tools or apparatuses that could be handled in different ways. Heyes[22][23] and co-workers reported evidence for imitation in rats that pushed a lever in the same direction as their models, though later on they withdrew their claims due to methodological problems in their original setup.[24] By trying to design a testing paradigm that is less arbitrary than pushing a lever to the left or to the right, Custance and co-workers[25] introduced the "artificial fruit" paradigm, where a small object could be opened in different ways to retrieve food placed inside—not unlike a hard-shelled fruit. Using this paradigm, scientists reported evidence for imitation in monkeys[26][27] and apes.[28][29][30] There remains a problem with such tool (or apparatus) use studies: what animals might learn in such studies need not be the actual behavior patterns (i.e., the actions) that were observed. Instead they might learn about some effects in the environment (i.e., how the tool moves, or how the apparatus works).[31] This type of observational learning, which focuses on results, not actions, has been dubbed emulation (see Emulation (observational learning)).

An article was written by Carl Zimmer, he looked into a study being done by Derek lyons, he was focusing on human evolution, so he started to study a chimpanzee.He first started with showing the chimp how to retrieve food from a box, So they had the scientist go in a demonstrate how to retrieve the food from the box. the chimp soon caught on and did exactly what the scientist just did. They wanted to see if the chimpanzees brain functioned just like humans brain so they related this same exact study to 16 children and they did the same procedure and once the children seen how it was done, they followed the same steps.[32]

Imitation in animals

Imitation in animals is a study in the field of social learning where learning behavior is observed in animals specifically how animals learn and adapt through imitation. Imitation is the behavior of observing and replicating another's behavior, an advanced behavior that is exhibited predominantly by humans and holds much debate in the science world about its role in animal learning and behavior.

Some scientists believe true imitation is only produced by humans, arguing that simple learning though sight is not enough to sustain as a being who can truly imitate.[33] Thorpe defines true imitation as “the copying of a novel or otherwise improbable act or utterance, or some act for which there is clearly no instinctive tendency,” which is highly debated for its portrayal of imitation as a mindless repeating act.[33] True imitation is produced when behavioral, visual and vocal imitation is achieved, not just the simple reproduction of exclusive behaviors.[33] Imitation is not a simple reproduction of what one sees; rather it incorporates intention and purpose.[33] Animal imitation can range from survival purpose; imitating as a function of surviving or adapting, to unknown possible curiosity, which vary between different animals and produce different results depending on the measured intelligence of the animal.[33]

There is considerable evidence to support true imitation in animals.[34] Experiments performed on apes, birds and more specifically the Japanese quail have provided positive results to imitating behavior, demonstrating imitation of opaque behavior.[34] However the problem that lies is in the discrepancies between what is considered true imitation in behavior.[34] Birds have demonstrated visual imitation, where the animal simply does as it sees.[34] Studies on apes however have proven more advanced results in imitation, being able to remember and learn from what they imitate.[34] Studies have demonstrated far more positive results with behavioral imitation in primates and birds than any other type of animal.[34] Imitation in non primate mammals and other animals have been proven difficult to conclude solid positive results for and poses a difficult question to scientist on why that is so.[34]

Theories

There are two types of theories of imitation, transformational and associative. Transformational theories suggest that the information that is required to display certain behavior is created internally through cognitive processes and observing these behaviors provides incentive to duplicate them.[35] Meaning we already have the codes to recreate any behavior and observing it results in its replication. Bandura's "social cognitive theory" is one example of a transformational theory. [36] Associative, or sometimes referred to as "contiguity", [37] theories suggest that the information required to display certain behaviors does not come from within ourselves but solely from our surroundings and experiences.[35] Unfortunately these theories have not yet provided testable predictions in the field of social learning in animals and have yet to conclude strong results.[35]

New Developments

There have been three major developments in the field of animal imitation. The first, behavioral ecologists and experimental psychologists found there to be adaptive patterns in behaviors in different vertebrate species in biologically important situations.[38] The second, primatologists and comparative psychologists have found imperative evidence that suggest true learning through imitation in animals.[38] The third, population biologists and behavioral ecologists created experiments that demand animals to depend on social learning in certain manipulated environments.[38]

Child development

Developmental psychologist Jean Piaget noted that children in a developmental phase he called the sensorimotor stage (a period which lasts up to the first two years of a child) begin to imitate observed actions.[39] This is an important stage in the development of a child because the child is beginning to think symbolically, associating behaviors with actions, thus setting the child up for the development of further symbolic thinking. Imitative learning also plays a crucial role in the development of cognitive and social communication behaviors, such as language, play, and joint attention. Imitation serves as both a learning and a social function because new skills and knowledge are acquired, and communication skills are improved by interacting in social and emotional exchanges. It is shown, however, that "children with autism exhibit significant deficits in imitation that are associated with impairments in other social communication skills." [40] To help children with autism, reciprocal imitation training (RIT) is used. It is a naturalistic imitation intervention that helps teach the social benefits of imitation during play by increasing child responsiveness and by increasing imitative language.[40]

Reinforcement learning, both positive and negative, and punishment (psychology), are used by people that children imitate to either promote or discontinue behavior. If a child imitates a certain type of behavior or action and the consequences are rewarding, the child is very likely to continue performing the same behavior or action. The behavior "has been reinforced (i.e. strengthened)." [41] However, if the imitation is not accepted and approved by others, then the behavior will be weakened.

Naturally, children are surrounded by many different types of people that influence their actions and behaviors, including parents, family members, teachers, peers, and even characters on television programs. These different types of individuals that are observed are called models. According to Saul McLeod, "these models provide examples of masculine and feminine behavior to observe and imitate."[41] Children imitate the behavior they have observed from others, regardless of the gender of the person and whether or not the behavior is gender appropriate. However, it has been proven that children will reproduce the behavior that "its society deems appropriate for its sex."[41]

Infants

Infants have the ability to reveal an understanding of certain outcomes before they occur, therefore in this sense they can somewhat imitate what they have perceived. Andrew N. Meltzoff, ran a series of tasks involving 18-month-old infants to imitate actions they perceived from adults. In this gathering he had concluded that the infants, before trying to reproduce the actions they wish to imitate, some how revealed an understanding of the intended goal even though they failed to replicate the result wished to be imitated. These task implicated that the infants knew the goal intended.[42] Gergely, Bekkering, and Király( 2002) figured that infants not only understand the intended goal but also the intentions of the person they were trying to imitate engaging in "rational imitation".[42]

Infants are able to imitate facial expressions as soon as their first few days of life according to results retrieved from experiments performed at the Mailman Centre for Child Development at the University of Miami Medical School. 74 newborn babies (with a mean age of 36 hours) were tested to see if they were able to imitate a smile, a frown and a pout, and a wide-open mouth and eyes. An observer stood behind the experimenter (so he/she couldn't see what facial expressions were being made by the experimenter) and watched only the babies' facial expressions, recording their results. Just by looking only at the babies' faces, the observer was more often able to correctly guess what facial expression was being presented to the child by the experimenter.[43] After the results were calculated, "the researchers concluded that… babies have an innate ability to compare an expression they see with their own sense of muscular feedback from making the movements to match that expression."[43]

At around eight months, infants will start to copy their child care providers' movements when playing pat-a-cake and peek-a-boo, as well as imitating familiar gestures, such as clapping hands together or patting a doll’s back. At around 18 months, infants will then begin to imitate simple actions they observe adults doing, such as taking a toy phone out of a purse and saying "hello", pretending to sweep with a child-sized broom, as well as imitating using a toy hammer.[citation needed]

Toddlers

At around 30–36 months, toddlers will then start to imitate their parents by pretending to get ready for work and school, and saying the last word(s) of what an adult just said. For example, toddlers may say "bowl" or "a bowl" after they hear someone say, "That's a bowl." They may also imitate the way family members communicate by using the same gestures and words. For example, a toddler will say, “Mommy bye-bye” after the father says, "Mommy went bye-bye."[44] Studies now show imitation of body movements are seen as early as birth, says Andrew N. Meltzoff.[45]

Toddlers love to imitate their parents and help when they can. Imitation helps toddlers learn and through experiences, last impressions are made. 12-36 month olds learn by doing, not by watching so as a caretaker and good role model, it is good to show them simple tasks like putting on socks or holding a spoon.[46]

Duke developmental psychologist Carol Eckerman did a study on toddlers imitating toddlers. With this study, she found that at the age of 2 children involve themselves in imitation play to communicate with one another. This can be seen within a culture or across different cultures. 3 common imitative patterns Eckerman found were reciprocal imitation, follow-the-leader and lead-follow.[47]

Kaye's "apprenticeship" theory of imitation rejected assumptions that other authors had made about its development. His research showed that there is no one simple imitation skill with its own course of development. What changes is the type of behavior imitated.[48]

An important agenda for infancy is the progressive imitation of higher levels of use of signs, until the ultimate achievement of symbols. The principal role played by parents in this process is their provision of salient models within the facilitating frames that channel the infant’s attention and organize his imitative efforts.

Gender and age differences

Still unaware of despair, a small boy of Matera, Italy, unconsciously repeats the gesture of his grandmonther's hands, ca. 1948 - ca. 1955

Although imitation is very useful when it comes to cognitive learning with toddlers, research has shown that there are some gender and age differences when it comes to imitation. Research done to judge imitation in toddlers 2–3 years old shows that when faced with certain conditions 2 displayed more motor imitation than 3 year olds, 3 year olds displayed more verbal reality imitations than 3 year olds girls and boys displayed more motor imitation than girls.[49]

No other research is more controversial pertaining gender differences in toddler imitation than renowned psychologist, Bandura's, bobo doll experiments.[50] The goal of the experiment was to see what happens to toddlers when exposed to aggressive and non aggressive adults, would the toddlers imitate the behavior of the adults and if so, which gender is more likely to imitate the aggressive adult. In the beginning of the experiment Bandura had several predictions that actually came true. Children exposed to violent adults will imitate the actions of that adult when the adult is not present, boys who had observed an adult of the opposite sex act aggressively are less likely to act violently than those who witnessed a male adult act violently. In fact 'boys who observed an adult male behaving violently were more influenced than those who had observed a female model behavior aggressively'. One fascinating observation was that while boys are likely to imitate physical acts of violence, girls are likely to imitate verbal acts of violence.[citation needed]

Negative imitation

Imitation plays such a major role on how a toddler interprets the world. So much of a child's understanding is derived from imitation, due to lack of verbal skill imitation is a toddlers way of communication with the world. It is what connects them to the communicating world, as they continue to grow they begin to learn more and more. That is why it is crucial for parents to be cautious as to how they act and behave around their toddlers. Imitation is the toddlers way of confirming and dis-conforming socially acceptable actions in our society. Actions like washing dishes, cleaning up the house and doing chores are actions you want your toddlers to imitate. Imitating negative things is something that is never beyond young toddlers. If they are exposed to cursing and violence, it is going to be what the child views as the norm of his or her world, remember imitation is the 'mental activity that helps to formulate the conceptions of the world for toddlers' Hay et al. (1991), when a toddler sees something so often he or she will form his or her reality around that action. So it is important for patents to be careful what they say or do in front of their children.[citation needed]

Autism

Children with autism exhibit significant impairment in imitation skills.[40] Imitation deficits have been reported on a variety of tasks including symbolic and nonsymbolic body movements, symbolic and functional object use, vocalizations, and facial expressions.[40] In contrast, typically-developing children can copy a broad range of novel (as well as familiar) rules from a very early age.[51] Problems with imitation discriminate children with autism from those with other developmental disorders as early as age 2 and continue into adulthood.[52]

Imitation plays a crucial role in the development of cognitive and social communication behaviors, such as language, play, and joint attention.[40] Children with autism exhibit significant deficits in imitation that are associated with impairments in other social communication skills. It is unclear whether imitation is mediating these relationships directly, or whether they are due to some other developmental variable that is also reflected in the measurement of imitation skills.[40]

Automatic imitation

The automatic imitation comes very fast when a stimulus is given to replicate. The imitation can match the commands with the visual stimulus (compatible) or it cannot match the commands with the visual stimulus (incompatible). For example: 'Simon Says', a game played with children where they are told to follow the commands given by the adult. In this game, the adult gives the commands and shows the actions; the commands given can either match the action to be done or it will not match the action. The children who imitate the adult who has given the command with the correct action will stay in the game. The children who imitate the command with the wrong action will go out of the game, and this is where the child's automatic imitation comes into play. Psychologically, the visual stimulus being looked upon by the child is being imitated faster than the imitation of the command. In addition, the response times were faster in compatible scenarios than in incompatible scenarios.[53]

Children are surrounded by many different people, day by day. Their parents make a big impact on them and usually what the children do, is what they have seen their parent do. In this article they found that a child simply watching its mother sweep the floor, the child right after soon picked up on it and start to imitate the mother by sweeping the floor. By the children imitating, they are really teaching themselves how to do things without instruction from the parent or guardian. Toddlers love to play the game of house, they picked up on this game of house by television, school or at home, the play the game how they see it. The kids imitate their parents or anybody in their family. in the article it says it is so easy for them to pick up on the things they see on an every day basis.[citation needed]

Deferred Imitation

Piaget coined the term deferred imitation and suggested that it arises out of the child's increasing ability to "form mental representations of behavior performed by others."[39] Deferred imitation is also "the ability to reproduce a previously witnessed action or sequence of actions in the absence of current perceptual support for the action."[1] Instead of copying what is currently occurring, individuals repeat the action or behavior later on. It appears that infants show an improving ability for deferred imitation as they get older, especially by 24 months. By 24 months, infants are able to imitate action sequences after a delay of up to three months, meaning that "they're able to generalize knowledge they have gained from one test environment to another and from one test object to another."[1]

See also

References

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  2. ↑ Moss, Ellen; Strayer, F. F. (1988). "Imitation is the Greatest form of Flattery". PsycCRITIQUES 33 (11). doi:10.1037/026218. 
  3. ↑ George Herbert Mead, Mind, Self, and Society; Kenneth Kaye, The Mental and Social Life of Babies, U. Chicago Press 1982
  4. ↑ Susan Blackmore, The Meme Machine, Oxford U. Press 2007
  5. ↑ Jared Diamond, The Third Chimpanzee, HarperCollins 1992.
  6. ↑ In M. Bullowa, ed. Before Speech: The beginning of interpersonal communication, Cambridge U. Press 1979
  7. ↑ Kaye, Kenneth; Marcus, Janet (1981). "Infant imitation: The sensory-motor agenda". Developmental Psychology 17 (3): 258. doi:10.1037/0012-1649.17.3.258. 
  8. ↑ Iacoboni, M.; Woods, RP; Brass, M; Bekkering, H; Mazziotta, JC; Rizzolatti, G (1999). "Cortical Mechanisms of Human Imitation". Science 286 (5449): 2526–8. doi:10.1126/science.286.5449.2526. PMID 10617472. 
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  12. ↑ Krützen, Michael; Mann, Janet; Heithaus, Michael R.; Connor, Richard C.; Bejder, Lars; Sherwin, William B. (2005). "Cultural transmission of tool use in bottlenose dolphins". Proceedings of the National Academy of Sciences 102 (25): 8939–43. Bibcode:2005PNAS..102.8939K. doi:10.1073/pnas.0500232102. PMC 1157020. PMID 15947077. 
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  24. ↑ Heyes, C.M.; Ray, E.D.; Mitchell, C.J.; Nokes, T. (2000). "Stimulus Enhancement: Controls for Social Facilitation and Local Enhancement". Learning and Motivation 31 (2): 83–98. doi:10.1006/lmot.1999.1041. 
  25. ↑ Custance, Deborah; Whiten, Andrew; Fredman, Tamar (1999). "Social learning of an artificial fruit task in capuchin monkeys (Cebus apella)". Journal of Comparative Psychology 113: 13–23. doi:10.1037/0735-7036.113.1.13. 
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  32. ↑ Zimmer, Carl (December 13, 2005). "Children Learn by Monkey See, Monkey Do. Chimps Don't". The New York Times. 
  33. ↑ 33.0 33.1 33.2 33.3 33.4 Zentall, Thomas R. (2001). "Imitation in Animals: Evidence, Function, and Mechanisms". Cybernetics and Systems 32: 53–96. doi:10.1080/019697201300001812. 
  34. ↑ 34.0 34.1 34.2 34.3 34.4 34.5 34.6 Zentall, Thomas R. (2003). "Imitation by animals: How do they do it?". Current Directions in Psychological Science 12 (3): 91–5. doi:10.1111/1467-8721.01237. JSTOR 20182847. 
  35. ↑ 35.0 35.1 35.2 Heyes, Cecilia M.; Ray, Elizabeth D. (2000). "What is the Significance of Imitation in Animals?". In Slater, Peter J.B.; Rosenblatt, Jay S.; Snowdon, Charles T. et al. Advances in the Study of Behavior 29. pp. 215–45. doi:10.1016/S0065-3454(08)60106-0. ISBN 978-0-12-004529-7. 
  36. ↑ Bandura, A. Social foundations of thought and action: A social cognitive theory. Prentice-Hall, 1986.
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  38. ↑ 38.0 38.1 38.2 Galef, Bennett G. (1998). "Recent progress in studies of imitation and social learning in animals". In Sabourin, Michel; Craik, Fergus; Robert, Michèle. Advances in psychological science, Vol. 2: Biological and cognitive aspects. Hove, England: Psychology Press. pp. 275–99. ISBN 978-0-86377-471-3. 
  39. ↑ 39.0 39.1 Carlson, Neil R.; Buskist, William; Enzle, Michael E.; Heth, C Donald (2005). Psychology: The Science of Behaviour (3rd ed.). Pearson Education Canada. p. 384. ISBN 978-0-205-40386-8. 
  40. ↑ 40.0 40.1 40.2 40.3 40.4 40.5 Ingersoll, Brooke (2008). "The Social Role of Imitation in Autism". Infants & Young Children 21 (2): 107–19. doi:10.1097/01.IYC.0000314482.24087.14. 
  41. ↑ 41.0 41.1 41.2 McLeod, S. A. (2011). "Bandura: Social learning theory". Simply Psychology. Retrieved November 10, 2012. 
  42. ↑ 42.0 42.1 Tomasello, Michael (2006). "Rational Imitation in 12-Month-Old Infants Christiane Schwier, Catharine van Maanen, Malinda Carpenter". Infancy 10 (3): 303–11. doi:10.1207/s15327078in1003_6. 
  43. ↑ 43.0 43.1 "Newborns found able to imitate facial expressions". The New York Times. 12 October 1982. Retrieved November 14, 2012. 
  44. ↑ "Foundation: Imitation: California infant/toddler learning & development foundations". California Department of Education. 2012. Retrieved November 10, 2012. 
  45. ↑ Meltzoff, Andrew N.; Prinz, Wolfgang, eds. (2002). The Imitative Mind: Development, Evolution and Brain Bases. Cambridge University Press. ISBN 978-1-139-43976-3. 
  46. ↑ Stiefel, Chana (2012). "What Your Child Learns By Imitating You". Parents Magazine. 
  47. ↑ Malcom, Kelly (30 June 2000). "Studies shed light on toddler development". 
  48. ↑ Kaye, Kenneth (1982). "Imitation". The Mental and Social Life of Babies. pp. 155–88. ISBN 978-0-226-42848-2. 
  49. ↑ Patrick, Karen; Richman, Charles L. (1985). "Imitation in Toddlers as a Function of Motor and Verbal Aspects of Modeling". The Journal of Genetic Psychology 146 (4): 507–18. doi:10.1080/00221325.1985.10532470. PMID 3835229. 
  50. ↑ Cherry, Kendra. "Bobo Doll Experiment". About.com. 
  51. ↑ Subiaul, Francys; Lurie, Herbert; Romansky, Kathryn; Klein, Tovah; Holmes, David; Terrace, Herbert (2007). "Cognitive imitation in typically-developing 3- and 4-year olds and individuals with autism". Cognitive Development 22 (2): 230. doi:10.1016/j.cogdev.2006.10.003. PMC 2818295. PMID 20148122. 
  52. ↑ Rogers, Sally J.; Hepburn, Susan L.; Stackhouse, Tracy; Wehner, Elizabeth (2003). "Imitation performance in toddlers with autism and those with other developmental disorders". Journal of Child Psychology and Psychiatry 44 (5): 763–81. doi:10.1111/1469-7610.00162. PMID 12831120. 
  53. ↑ Heyes, Cecilia (2011). "Automatic imitation". Psychological Bulletin 137 (3): 463–83. doi:10.1037/a0022288. PMID 21280938. 

Further reading

  • Zentall, Thomas R. (2006). "Imitation: Definitions, evidence, and mechanisms". Animal Cognition 9 (4): 335–53. doi:10.1007/s10071-006-0039-2. PMID 17024510. 
  • Liepmann, H. (1900). Das Krankheitsbild der Apraxie (motorische Asymbolie). Berlin: S. Karger Publ. 
  • Liepmann, H. (1905). Über die Störungen des Handelns bei Gehirnkranken. Berlin: S. Karger Verlag. 
  • Liepmann, H. (1908). Drei Aufsätze aus dem Apraxiegebiet. Berlin: S. Karger Publ. 
  • Liepmann, H. (1920). "Apraxie". Ergebn ges Med 1: 516–43. 

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