Social and pragmatic deficits in autism: Cognitive or affective? (original) (raw)
References
Abelson, A. G. (1981). The development of gender identity in the autistic child.Child: Care, Health and Development, 7, 347–356. Google Scholar
American Psychiatric Association. (1980).Diagnostic and statistical manual of mental disorders (3rd ed.). Washington, DC: Author. Google Scholar
Amsterdam, B., & Greenberg, L. M. (1977). Self-conscious behaviour of infants: a videotape study.Developmental Psychobiology, 10, 1–6. PubMed Google Scholar
Argyle, M. (1972). Non-verbal communication in social interaction. In R. Hinde (Ed.),Nonverbal communication. New York, Cambridge University Press. Google Scholar
Attwood, A. J. (1984).Gestures of autistic children. Unpublished doctoral dissertation, University of London.
Austin, J. (1962).How to do things with words. Oxford, Basil Blackwell. Google Scholar
Ball, J. (1978).A pragmatic analysis of autistic children's language with respect to aphasic and normal language development. Unpublished undergraduate dissertation, Melbourne University, Australia. Google Scholar
Baltaxe, C. (1977). Pragmatic deficits in the language of autistic adolescents.Journal of Pediatric Psychology, 2, 176–180. Google Scholar
Baltaxe, C., & Simmons, J. Q. (1977). Bedtime soliloquies and linguistic competence in autism.Journal of Speech and Hearing Disorders, 42, 376–393. PubMed Google Scholar
Baron-Cohen, S. (1985).Social cognition and pretend play in autism. Unpublished doctoral dissertation, University of London.
Baron-Cohen, S. (1987a). Autism and symbolic play.British Journal of Developmental Psychology, 5, 139–148. Google Scholar
Baron-Cohen, S. (1987b).The more able autistic child's “theory of mind”. Unpublished M. Phil. thesis, University of London, Institute of Psychiatry.
Baron-Cohen, S., Leslie, A. M., & Frith, U. (1985). Does the autistic child have a ‘theory of mind’?Cognition, 21, 37–46. PubMed Google Scholar
Baron-Cohen, S., Leslie, A. M., & Frith, U. (1986). Mechanical, behavioural and Intentional understanding of picture stories in autistic children.British Journal of Developmental Psychology, 4, 113–125. Google Scholar
Bartak, L., Rutter, M., & Cox, A. (1975). A comparative study of infantile autism and specific developmental receptive language disorder: 1. The children.British Journal of Psychiatry, 126, 127–147. PubMed Google Scholar
Bates, E. (1976).Language in context. New York: Academic Press. Google Scholar
Bedrosian, J. L., & Prutting, G. A. (1978). Communicative performance of mentally retarded adults in four conversational settings.Journal of Speech and Hearing Research, 21, 79–95. PubMed Google Scholar
Bettelheim, B. (1967).The empty fortress: Infantile autism and the birth of the self. New York: Free Press. Google Scholar
Bernard-Opitz, V. (1982). Pragmatic analysis of the communicative behaviour of an autistic child.Journal of Speech and Hearing Disorders, 47, 99–109. PubMed Google Scholar
Brentano, F. (1874). Psychologie vom Empirischen Standpunkt. In R. M. Chisholm (Ed. and partial Trans.),Realism and the background of phenomenology. Glencoe, IL.: Free Press. Google Scholar
Boucher, J. (1981). Memory for recent events in autistic children.Journal of Autism and Developmental Disorders, 11, 239–302. Google Scholar
Butterworth, G. E. (1986). Overview of the Conference.BPS Developmental Psychology Section Newsletter, 14, 16–25. Google Scholar
Caparulo, B., & Cohen, D. J. (1977). Cognitive structures, language, and emerging social competence in autistic and aphasic children.Journal of the American Academy of Child Psychiatry, 15, 620–644. Google Scholar
Castell, R. (1970). Physical distance and visual attention as measures of social interaction between child and adults. In S. J. Hutt, & C. Hutt (Eds.),Behaviour studies in psychiatry. Oxford: Pergamon. Google Scholar
Clark, P., & Rutter, M. (1981). Autistic children's responses to structure and interpersonal demands.Journal of Autism and Developmental Disorders, 11, 201–217. PubMed Google Scholar
Coggins, T. E., Carpenter, R. L., & Owings, N. O. (1983). Examining early intentional communication in Down's Syndrome and non-retarded children.British Journal of Disorders of Communication, 18, 98–106. PubMed Google Scholar
Cromer, R. (1981). Developmental language disorders: cognitive processes, semantics, pragmatics, phonology, and syntax.Journal of Autism and Developmental Disorders, 11, 57–74. PubMed Google Scholar
Cunningham, M. A. (1968). A comparison of the language of psychotic and nonpsychotic children who are mentally retarded.Journal of Child Psychology and Psychiatry, 9, 229–244. PubMed Google Scholar
Curcio, F. (1978). Sensorimotor functioning and communication in mute autistic children.Journal of Autism and Childhood Schizophrenia, 8, 281–292. PubMed Google Scholar
Damasio, A., & Maurer, R. (1978). A neurological model for childhood autism.Archives of Neurology, 35, 777–786. PubMed Google Scholar
Damon, W. (1979). Why study social-cognitive development?Human Development, 22, 206–211. Google Scholar
Davids, A. (1974). Effects of human and non-human stimuli on attention and learning in psychotic children.Child Psychiatry and Human Development, 5, 108–116. PubMed Google Scholar
Dawson, G., & Adams, A. (1984). Imitation and social responsiveness in autistic children.Journal of Abnormal Child Psychology, 12, 209–226. PubMed Google Scholar
Dawson, G., & Fernald, M. (1987). Perspective-taking ability and its relationship to the social behaviour of autistic children.Journal of Autism and Developmental Disorders, 17, 487–498. PubMed Google Scholar
Dawson, G., & McKissick, F. C. (1984). Self-recognition in autistic children.Journal of Autism and Developmental Disorders, 14, 383–394. PubMed Google Scholar
DeLong, G. R. (1978). A neuropsychologic interpreation of infantile autism. In M. Rutter & E. Schopler (Eds.),Autism: A reappraisal of concepts and treatment. New York: Plenum Press. Google Scholar
DeMyer, M. K., Alpern, G. D., Barton, S., DeMyer, W. E., Churchill, D. W., Hingtgen, J. N., Bryson, C. Q., Pontius, W., & Kimberlin, C. (1972). Imitation in autistic, early schizophrenic, and non-psychotic subnormal children.Journal of Autism and Childhood Schizophrenia, 2, 264–287. PubMed Google Scholar
Dennett, D. (1978).Brainstorms: philosophical essays on mind and psychology. Harvester Press.
Dewey, M., & Everard, P. (1974). The near normal autistic adolescent.Journal of Autism and Childhood Schizophrenia, 4, 348–356. Google Scholar
Dixon, J. C. (1957). Development of self-recognition.Journal of General Psychology, 91, 251–256. Google Scholar
Fay, W. H., & Schuler, A. L. (1980).Emerging language in autistic children. London: Edward Arnold. Google Scholar
Fein, D., Pennington, B., Markowitz, P., Braverman, M., & Waterhouse, L. (1986). Towards a neuropsychological model of infantile autism: Are the social deficits primary?Journal of the American Academy of Child Psychiatry, 25, 198–212. PubMed Google Scholar
Ferrari, M., & Matthews, W. S. (1983). Self-recognition deficits in autism: Syndrome-specific or general developmental delay?Journal of Autism and Developmental Disorders, 13, 317–324. PubMed Google Scholar
Flannery, C. N. (1976).Self-recognition and stimulus complexity preference in autistic children. Unpublished masters thesis, University of Orleans.
Frith, U. (1982). Psychological abnormalities in early childhood psychoses. In J. Wing & L. Wing (Eds.),Handbook of psychiatry (Vol. 3). London: Cambridge University Press. Google Scholar
Frye, D. (1981). Developmental changes in strategies of social interaction. In M. E. Lamb & L. R. Sherrod (Eds.),Infant social cognition: Empirical and theoretical considerations. Hillsdale, NJ: Erlbaum. Google Scholar
Furrow, D. (1984). Social and private speech at 2 years.Child Development, 55, 355–362. Google Scholar
Gajzago, C., & Prior, M. (1974). Two cases of ‘recovery’ in Kanner Syndrome.Archives of General Psychiatry, 31, 264–268. PubMed Google Scholar
Goode, S. (1985).Recognition accuracy for faces presented in the photographic negative: a study with autistic adults. Unpublished M. Phil. thesis, University of London, Institute of Psychiatry.
Grice, H. P. (1957). Meaning.Philosophical Review, 66, 377–388. Google Scholar
Grice, H. P. (1975). Logic and conversation. In R. Cole & J. Morgan (Eds.),Syntax and semantics: Speech acts (pp. 41–58). New York: Academic Press, (Original work published 1967). Google Scholar
Hamlyn, D. (1974). Person perception and our understanding of others. In T. Mischel (Ed.),Understanding other persons. Oxford: Blackwell. Google Scholar
Hammes, J. G. W., & Langdell, T. (1981). Precursors of symbol formation and childhood autism.Journal of Autism and Developmental Disorders, 11, 331–345. PubMed Google Scholar
Hermelin, B., & O'Connor, N. (1970).Psychological experiments with autistic children. London: Pergamon Press. Google Scholar
Hermelin, B. & O'Connor, N. (1985). Logico-affective states and non-verbal language. In E. Schopler & G. B. Mesibov,Communication problems in autism. New York: Plenum Press. Google Scholar
Hobson, R. P. (1983). The autistic child's recognition of age-related features of people, animals, and things.British Journal of Developmental Psychology, 1, 343–352. Google Scholar
Hobson, R. P. (1984). Early childhood autism and the question of egocentrism.Journal of Autism and Developmental Disorders, 14, 85–104. PubMed Google Scholar
Hobson, R. P. (1986a). The autistic child's appraisal of expressions of emotion.Journal of Child Psychology and Psychiatry, 27, 321–342. PubMed Google Scholar
Hobson, R. P. (1986b). The autistic child's appraisal of expressions of expressions of emotion: A further study.Journal of Child Psychology and Psychiatry, 27, 671–680 PubMed Google Scholar
Hobson, R. P. (1987). The autistic child's recognition of age- and sex-related characteristics of people.Journal of Autism and Developmental Disorders, 17, 63–69. PubMed Google Scholar
Hobson, R. P. (in press). Beyond cognition: A theory of autism. In G. Dawson (Ed.),autism: New perspectives on diagnosis, nature and treatment. New York: Guilford.
Hogrefe, G. J., Wimmer, H., & Perner, J. (1986). Ignorance versus false belief: A developmental lag in attribution of epistemic states.Child Development, 57, 567–582. Google Scholar
Hopkins, J. M., & Lord, C. (1981). The social behaviour of autistic children with younger and same-age non-handicapped peers. In D. Parke (Ed.),Papers and reports from international meetings of the National Society for Autistic Children, Boston, MA.
Howlin, P. (1986). An overview of social behaviour in autism. In E. Schopler & G. B. Mesibov (Eds.),Social behavior in autism. New York: Plenum Press. Google Scholar
Hurtig, R., Ensrud, S., & Tomblin, J. B. (1982). The commmunicative function of question production in autistic children.Journal of Autism and Developmental Disorders, 12, 57–69. PubMed Google Scholar
Hutt, C., & Ounsted, C. (1966). The biological significance of gaze aversion with particular reference to the syndrome of infantile autism.Behavioural Science, 11, 346–356. Google Scholar
Jennings, W., (1973). A study of the preference for affective cues in autistic children.Dissertation Abstracts International, 34 (8-B), 4045–4046. Google Scholar
Johnson-Laird, P. N. (1983).Mental models. Cambridge, England: Cambridge University Press. Google Scholar
Jones, V., & Prior, M. (1985). Motor imitationabilities and neurological signs in autistic children.Journal of Autism and developmental Disorders, 15, 37–46. PubMed Google Scholar
Kanner, L. (1943). Autistic disturbances of affective contact,Nervous Child, 2, 217–250. Google Scholar
Kanner, L. (1973).Childhood psychosis: initial studies and new insights. London: Wiley. Google Scholar
Kanner, L., & Eisenberg, L. (1956). Early infantile autism, 1943–55.American Journal of Orthopsychiatry, 26, 55–65. Google Scholar
Keenan, E., & Klein, E. (1975). Coherency in children's discourse.Journal of Psycholinguistic Research, 4, 365–380. Google Scholar
Langdell, T. (1978). Recognition of faces: An approach to the study of autism.Journal of Child Psychology and Psychiatry, 19, 225–268. Google Scholar
Langdell, T. (1980, September)Pragmatic aspects of autism: or why is ‘I’ a normal word. Unpublished paper presented at the BPS Developmental Psychology Conference, Edinburgh.
Langdell, T. (1981).Face perception: An approach to the study of autism. Unpublished doctoral dissertation, University of London.
Layton, T. L., & Stutts, N. (1985). Pragmatic usage by autistic children under different treatment modes.Australian Journal of Human Communication Disorders, 13(2), 127–142. Google Scholar
Leslie, A. M. (1987). Pretence and representation: the origins of “theory of mind”.Psychological Review, 94, 412–426. Google Scholar
Longhurst, T. M. (1974). Communication in retarded adolescents: Sex and intelligence level.American Journal of Mental Deficiency, 78, 607–618. PubMed Google Scholar
Lord, C. (1984). Peer relations in autism. In F. J. Morrison, C. Lord, & D. P. Keating (Eds.),Applied Developmental Psychology (Vol. 1, pp. 165–229). New York: Academic Press. Google Scholar
Loveland, K. A. & Landry, S. H. (1986). Joint attention and language in autism and developmental language delay.Journal of Autism and Developmental Disorders, 16, 335–349. PubMed Google Scholar
Mans, L., Cicchetti, D., & Stroue, L. A. (1978). Mirror reactions of Down's Syndrome infants and toddlers: cognitive underpinnings of self-recognition.Child Development, 49, 1247–1250. PubMed Google Scholar
McCaleb, P., & Prizant, B. M. (1985). Encoding of new versus old information by autistic children.Journal of Speech and Hearing Disorders, 50, 230–240. PubMed Google Scholar
McHale, S. M. (1983). Social interactions of autistic and non-handicapped children during free play.American Journal of Orthopsychiatry, 53, 81–91. PubMed Google Scholar
Mirenda, P. L., donnellan, A., & Yoder, D. E. (1983). Gaze behaviour: A new look at an old problem.Journal of Autism and Developmental Disorders, 13, 397–409. PubMed Google Scholar
Murray, L., & Trevarthen, C. (1985). Emotional regulation of interactions between two month olds and their mothers. In T. M. Field & N. A. Fox (Eds.),Social perception in infants. Norwood, NJ: Ablex. Google Scholar
Mueller, E., Bleier, M., Krakow, J., Hegedus, K., & Cournoyer, P. (1977). The development of peer verbal interaction among 2 year old boys.Child Development, 48, 284–287. Google Scholar
Mundy, P., Sigman, M., Ungerer, J., & Sherman, T. (1986). Defining the social deficits of autism: The contribution of non-verbal communication measures.Journal of Child Psychology and Psychiatry, 27, 657–669. PubMed Google Scholar
Needleman, R., Ritvo, E. R., & Freeman, B. J. (1980). Objectively defined linguistic parameters in children with autism and other developmental disabilities.Journal of Child Psychology and Psychiatry, 27, 657–669. Google Scholar
Needleman, R., Ritvo, E. R., & Freeman, B. J. (1980). Objectively defined linguistic parameters in children with autism and other developmental disabilities.Journal of Autism and Developmental Disorders, 10, 389–398. PubMed Google Scholar
Neuman, C. J., & Hill, S. D. (1978). Seff-recognition and stimulus preference in autistic children.Developmental Psychobiology, 11, 571–578. PubMed Google Scholar
Newson, E., Dawson, M., & Everard, P. (1984). The natural history of able autistic people: Their management and functioning in a social context. Summary of the report to the DHSS.Communication,18(1, 2, 3, & 4).
Ohta, M., (1987). Cognitive disorders of infantile autism: a study employing the WISC, spatial relationship conceptualization, and gesture imitations.Journal of Autism and Developmental Disorders, 17, 45–62. PubMed Google Scholar
O'Connor, N., & Hermelin B. (1967). The selective visual attention of psychotic children.Journal of Child Psychology and Psychiatry, 8, 167–179. Google Scholar
Pacci-Cooper, J., Curcio, F., & Sacharko, G. (1981).A comparison of discourse features in normal and autistic language. Paper presented at the Boston University Conference on Language Development, Boston.
Park, C. C. (1983).The seige: The first eight years of an autistic child, with an epilogue fifteen years after. London: Hutchinson. Google Scholar
Paul, R., & Cohen, D. J. (1985). Comprehension of indirect requests in adults with autistic disorders and mental retardation.Journal of Speech and Hearing Research, 28, 475–479. PubMed Google Scholar
Paul, R., & Feldman, C. (1984).Communication deficits in autism. Paper presented at the Institute for Communication Deficits in Autistic Youth, Columbia University, New York.
Piaget, J. (1932).The language and thought of the child. London: Routledge and Kegan Paul. Google Scholar
Premack, D., & Woodruff, G. (1978). Does the chimpanzee have a ‘theory of mind’?Behaviour and Brain Sciences, 4, 515–526. Google Scholar
Price-Williams, D., & Sabsay, S. (1979). Communicative competence among severely retarded persons.Semiotica, 26, 35–63. Google Scholar
Prizant, B. M. (1983). Language acquisition and communicative behaviour in autism: Towards an understanding of the “whole” of it.Journal of Speech and Hearing Disorders, 48, 296–307. PubMed Google Scholar
Prizant, B. M. (1984). Assessment and intervention of communicative problems in children with autism.Communicative Disorders, 9, 127–142. Google Scholar
Prizant, B. M., & Duchan, J. F. (1981). The functions of immediate echolalia in autistic children.Journal of Speech and Hearing Disorders, 46, 241–249. PubMed Google Scholar
Prizant, B., & Rydell, P. J. (1984). Analysis of functions of delayed echolalia in autistic children.Journal of Speech and Hearing Research, 27, 183–192. PubMed Google Scholar
Pylyshyn, Z. W. (1978). When is attribution of beliefs justified?Behavioural and Brain Sciences, 1, 592–593. Google Scholar
Richer, J. (1976). The social avoidance of autistic children.Animal Behaviour, 2, 898–906. Google Scholar
Richer, J., & Coss, R. (1976). Gaze aversion in autistic and normal children.Acta Psychiatrica Scandinavica, 53, 193–210. PubMed Google Scholar
Rom, A., & Bliss, L. S. (1981). A comparison of verbal communication skills of language impaired and normal speaking children.British Journal of Communication Disorders, 14, 133–40. Google Scholar
Rumsey, J. M., Rapoport, J. L., & Sceery, W. R. (1985). Autistic children as adults: psychiatric, social and behavioural outcomes.Journal of the American Academy of Child Psychiatry, 24, 465–473. PubMed Google Scholar
Rutter, M. (1983). Cognitive deficits in the pathogenesis of autism.Journal of Child Psychology and Psychiatry, 24, 513–531. PubMed Google Scholar
Rutter, M. (1986). Child psychiatry: Looking 30 years ahead.Journal of Child Psychology and Psychiatry, 27, 803–840. PubMed Google Scholar
Rutter, M., Greenfield, D., & Lockyer, L. (1967). A five to fifteen year follow-up of infantile psychosis: II. Social and behavioural outcome.British Journal of Psychiatry, 113, 1183–1189. PubMed Google Scholar
Schuler, A. L., Fletcher, E. C., & Davis-Welsh, J. D. (1977).Language development in child autism: A case study. Paper presented at the Meeting of the American Speech and Hearing Association, Chicago.
Searle, J. R. (1965). What is a speech act? In M. Black (Ed.),Philosophy in America (pp. 221–239). London: Allen and Unwin. Google Scholar
Searle, J. R. (1979). What is an Intentional state?Mind, 88, 74–92. Google Scholar
Shah, A., & Wing, L. (1986). Cognitive impairments affecting social behaivour in autism. In E. Schopler & G. B. Mesibov (Eds.),Social behaviour in autism. New York: Plenum Press. Google Scholar
Shapiro, T., Fish, B., & Ginsberg, G. L. (1972). The speech of a schizophrenic child from 2 to 6.American Journal of Psychiatry, 128, 1408–1414. PubMed Google Scholar
Shatz, M. (1978). On the development of communicative understandings: An early strategy for interpreting and responding to messages.Cognitive Psychology, 10, 271–301. Google Scholar
Sigman, M., Mundy, P., Sherman, T., & Ungerer, J. (1986). Social interactions of autistic, mentally retarded and normal children and their caregivers.Journal of Child Psychology and Psychiatry, 27, 647–656. PubMed Google Scholar
Sigman, M., & Ungerer, J. (1984). Attachment behaviours in autistic children.Journal of Autism and Developmental Disorders, 14, 231–244. PubMed Google Scholar
Sperber, D., & Wilson, D. (1986).Relevance: Communication and cognition. Oxford: Basil Blackwell. Google Scholar
Stone, W. L., & LaGreca, A. M. (1986). The development of social skills in children. In E. Schopler & G. B. Mesibov (Eds.),Social behaviour in autism. New York: Plenum Press. Google Scholar
Strawson, P. F. (1964). Intention and convention in speech acts.Philosophical Review, 73, 439–460. Google Scholar
Strawson, P. F. (1979). Meaning and truth. In T. Honderich & M. Burnyeat (Eds.),Philosophy as it is (pp. 513–539). Harmondsworth: Penguin. Google Scholar
Spiker, D., & Ricks, M. (1984). Visual self-recognition in autistic children: developmental relationships.Child Development, 55, 214–225. PubMed Google Scholar
Sussman, S., & Sklar, J. J. (1969). The social awareness of autistic children.American Journal of Orthopsychiatry, 39, 789–806. Google Scholar
Tager-Flusberg, H. (1981). On the nature of linguistic functioning in early infantile autisnm.Journal of Autism and Developmental Disorders, 11, 45–56. PubMed Google Scholar
Tager-Flusberg, H. (1985). Psycholinguistic approaches to language and communication in autism. In E. Schopler & G. B. Mesibov (Eds.),Communication problems in autism. New York: Plenum Press. Google Scholar
Tinbergen, N., & Tinbergen, E. a. (1983).‘Autistic’ children: New hope for a cure. London: Allen and Unwin. Google Scholar
Ungerer, J., & Sigman, M. (1981). Symbolic play and language comprehension in autistic children.Journal of the American Academy of Child Psychiatry, 20, 318–337. PubMed Google Scholar
Uzgiris, I., & Hunt, J. McV. (1975).Assessment in infancy. Urbana: University of Illinois Press. Google Scholar
van Kleeck, A., & Frankel, T. (1981). Discourse devices by language disordered children: A preliminary investigation.Journal of Speech and Hearing Disorders, 46, 250–257. PubMed Google Scholar
van Smeerdjik, J. (1981).Childhood autism and the problem of imitation. Unpublished honours thesis, La Trobe University, Victoria, Australia. Google Scholar
Volkmar, F. R. (1987). Social development. In D. J. Cohen, A. M. Donnellan, & R. Paul (Eds.),Handbook of autism and pervasive developmental disorders. New York: Wiley. Google Scholar
Weeks, S. J., & Hobson, R. P. (1987). The salience of facial expression for autistic children.Journal of Child Psychology and Psychiatry, 28, 137–152. PubMed Google Scholar
Weir, R. (1962).Language in the crib. The Hague: Mouton. Google Scholar
Wellman, H., & Lempers, J. D. (1977). The naturalistic communicative abilities of 2 year olds.Child Development, 48, 1052–1057. Google Scholar
Werner, H., & Kaplan, B. (1963),Symbol formation. New York: Wiley. Google Scholar
Wetherby, A. M. (1986). Ontogeny of communicative functions in autism.Journal of Autism and Developmental Disorders, 16, 295–316. PubMed Google Scholar
Wetherby, A. M., & Prutting, C. A. (1984). Profiles of communicative and cognitive-social abilities in autistic children.Journal of Speech and Hearing Research, 27, 364–377. PubMed Google Scholar
Wimmer, H., & Perner, J. (1983). Beliefs about beliefs: Representation and constraining function of wrong beliefs in young children's understanding of deception.Cognition, 13, 103–128. PubMed Google Scholar
Wing, L. (1978). Social, behavioural, and cognitive characteristics: An epidemiological approach. In M. Rutter & E. Schopler. (Eds.),Autism: A reappraisal of concepts and treatment. New York: Plenum Press. Google Scholar
Wing, L., & Gould, J. (1979). Severe impairments of social interaction and associated abnormalities in children: Epidemiology and classification.Journal of Autism and Developmental Disorders, 9, 11–29. PubMed Google Scholar
World Health Organization. (1978).International classification of diseases (9th rev.). Geneva: Author. Google Scholar