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12 - Symbols as Tools in the Development of Executive Function

from Part III - Symbols and Tools throughout the Life Span

Published online by Cambridge University Press:  29 July 2009

Adam Winsler
Affiliation:
George Mason University, Virginia
Charles Fernyhough
Affiliation:
University of Durham
Ignacio Montero
Affiliation:
Universidad Autónoma de Madrid
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Summary

Self-control over thought and behavior is a centrally important topic in cognitive and social development. Our research on the development of self-control aligns with theoretical and empirical investigations of executive functioning (EF), a neuropsychological approach to the study of cognitive control of representation, action, and emotion (e.g., Eslinger, 1996; Miyake et al., 2000; Stuss & Knight, 2002; Zelazo & Müller, 2002). EF is required for adaptive, goal-directed behaviors to solve novel problems, particularly those calling for the inhibition of automatic or established thoughts and responses. Thus, inhibition is a key component of EF (Casey, Tottenham, & Fossella, 2002). In this chapter, following an overview of EF, we present theory and research on symbols as tools in the development of inhibitory control skills. It is argued that pretense is a neglected aspect of symbolic thinking that might facilitate EF in addition to language. We discuss prior evidence that is consistent with this assertion and present an empirical investigation of preschool children's spontaneous strategies on a delay of gratification task, including both language and pretense strategies.

EXECUTIVE FUNCTION

Executive function is thought to contribute to individual differences and/or developmental changes in a wide array of cognitive abilities including attention, memory, reading comprehension, and theory of mind (e.g., Carlson, Mandell, & Williams, 2004; Dempster, 1992; Harnishfeger & Bjorklund, 1993; Posner & Rothbart, 1998). EF has also been implicated in the development of emotional and social competence and school readiness (e.g., Blair, 2002; Kochanska, Murray, Jacques, Koenig, & Vandegeest, 1996; Kopp, 1982).

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Publisher: Cambridge University Press
Print publication year: 2009

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References

Baddeley, A. D. (1986). Working memory. New York: Oxford University Press.Google ScholarPubMed
Behrend, D., Rosengren, K., & Perlmutter, , , M. (1989). A new look at the effects of age, task difficulty, and parent's presence on children's private speech. International Journal of Behavioral Development, 12, 305–320.CrossRefGoogle Scholar
Berk, L. E. (1992). Children's private speech: An overview of theory and the status of research. In Díaz, R. M. & Berk, L. E. (Eds.), Private speech: From social interaction to self-regulation (pp. 17–53). Hillsdale, NJ: Erlbaum.Google Scholar
Blair, C. (2002). School readiness: Integrating cognition and emotion in a neurobiological conceptualization of children's functioning at school entry. American Psychologist, 57, 11–127.CrossRefGoogle Scholar
Block, J. H., & Block, J. (1980). The role of ego-control and ego-resiliency in the organization of behavior. In Collins, W. A. (Ed.), The Minnesota Symposia on Child Psychology (Vol. 13, pp. 39–101). Hillsdale, NJ: Erlbaum.Google Scholar
Boysen, S. T., Berntson, G. G., Hannan, M. B., & Cacioppo, J. T. (1996). Quantity-based inference and symbolic representations in chimpanzees (Pan troglodytes). Journal of Experimental Psychology: Animal Behavior Processes, 22, 76–86.Google Scholar
Bretherton, I. (1989). Pretense. The form and function of make believe play. Developmental Review, 9, 383–401.CrossRefGoogle Scholar
Carlson, S. M. (2003). Executive function in context: Development, measurement, theory, and experience. Monographs of the Society for Research in Child Development, 68(3, Serial No. 274), 138–151.CrossRefGoogle ScholarPubMed
Carlson, S. M. (2005). Developmentally sensitive measures of executive function in preschool children. Developmental Neuropsychology, 28, 595–616.CrossRefGoogle ScholarPubMed
Carlson, S. M., Davis, A. C., & Leach, J. G. (2005). Less Is More: Executive function and symbolic representation in preschool children. Psychological Science, 16, 609–616.CrossRefGoogle ScholarPubMed
Carlson, S. M., Mandell, D. J., & Williams, L. (2004). Executive function and theory of mind: Stability and prediction from age 2 to 3. Developmental Psychology, 40, 1105–1122.CrossRefGoogle Scholar
Carlson, S. M., & Moses, L. J. (2001). Individual differences in inhibitory control and children's theory of mind. Child Development, 72, 1032–1053.CrossRefGoogle ScholarPubMed
Carlson, S. M., Moses, L. J., & Breton, C. (2002). How specific is the relation between executive function and theory of mind? Contributions of inhibitory control and working memory. Infant and Child Development, 11, 73–92.CrossRefGoogle Scholar
Carlson, S. M., Taylor, M., & Levin, G. R. (1998). The influence of culture on fantasy play: The case of Mennonite children. Merrill-Palmer Quarterly, 44, 538–565.Google Scholar
Carpendale, J. E. M., & Lewis, C. (2004). Constructing an understanding of mind: The development of children's understanding of mind within social interaction. Behavioral and Brain Sciences, 27, 79–150.CrossRefGoogle ScholarPubMed
Casey, B. J., Tottenham, N., & Fossella, J. (2002). Clinical, imaging, lesion, and genetic approaches toward a model of cognitive control. Developmental Psychobiology, 40, 237–254.CrossRefGoogle Scholar
Cournoyer, M., & Trudel, M. (1991). Behavioral correlates of self-control at 33 months. Infant Behavior and Development, 14, 497–503.CrossRefGoogle Scholar
Dempster, F. N. (1992). The rise and fall of the inhibitory mechanism: Toward a unified theory of cognitive development and aging. Developmental Review, 12, 45–75.CrossRefGoogle Scholar
Dewey, J. (1985). Context and thought. In Boydston, J. A. & Sharpe, A. (Eds.), John Dewey: The later works, 1925–1953 (Vol. 6, pp. 3–21). Carbondale: Southern Illinois University Press. (Original work published 1931)Google Scholar
Diamond, A. (1990). Developmental time course in infants and infant monkeys, and the neural bases of inhibitory control in reaching. Annals of the New York Academy of Sciences, 608, 637–676.CrossRefGoogle ScholarPubMed
Diamond, A. (2001). A model system for studying the role of dopamine in prefrontal cortex during early development in humans. In Nelson, C. & Luciana, M. (Eds.), Handbook of developmental cognitive neuroscience (pp. 433–472). Cambridge, MA: MIT Press.Google Scholar
Diamond, A. (2002). Normal development of prefrontal cortex from birth to young adulthood: Cognitive functions, anatomy, and biochemistry. In Stuss, D. T. & Knight, R. T. (Eds.), Principles of frontal lobe function (pp. 466–503). London: Oxford University Press.CrossRefGoogle Scholar
Diamond, A., Prevor, M. B., Callender, G., & Druin, D. P. (1997). Prefrontal cortex cognitive deficits in children treated early and continuously for PKU. Monographs of the Society for Research in Child Development, 62(4, Serial No. 252).CrossRefGoogle ScholarPubMed
Diamond, A., & Taylor, C. (1996). Development of an aspect of executive control: Development of the abilities to remember what I said and to “Do as I say, not as I do.” Developmental Psychobiology, 29, 315–334.3.0.CO;2-T>CrossRefGoogle Scholar
Dias, M. G., & Harris, P. L. (1990). The influence of the imagination on reasoning by young children. British Journal of Developmental Psychology, 8, 305–318.CrossRefGoogle Scholar
Dunn, M., & Dunn, M. (1997). Peabody Picture Vocabulary Test (3rd ed.). Circle Pines, MN: American Guidance Service.Google Scholar
Elias, C. L., & Berk, L. E. (1999, April). Self-regulation in young children: Is there a role for sociodramatic play? Poster presented at the biennial meeting of the Society for Research in Child Development, Albuquerque, NM.
Engle, R. W. (2002). Working memory capacity as executive attention. Current Directions in Psychological Science, 11, 19–23.CrossRefGoogle Scholar
Ervin-Tripp, S. (1991). Play in language development. In Scales, B., Almy, M., Nicolopoulou, A., & Ervin-Tripp, S. (Eds.), Play and the social context of development in early care and education (pp. 84–97). New York: Teachers College Press.Google Scholar
Eslinger, P. J. (1996). Conceptualizing, describing, and measuring components of executive function: A summary. In Lyon, G. R. & Krasnegor, N. A. (Eds.), Attention, memory, and executive function (pp. 367–395). Baltimore, MD: Brookes.Google Scholar
Espy, K. A., & Bull, R. (2005). Inhibitory processes in young children and individual variation in short-term memory. Developmental Neuropsychology, 28, 669–688.CrossRefGoogle ScholarPubMed
Espy, K. A., Kaufmann, P. M., & Glisky, M. L. (1999). Neuropsychological function in toddlers exposed to cocaine in utero: A preliminary study. Developmental Neuropsychology, 15, 447–460.CrossRefGoogle Scholar
Farver, J. M., & Howes, C. (1993). Cultural differences in American and Mexican mother-child pretend play. Merrill-Palmer Quarterly, 39, 344–358.Google Scholar
Fein, G. (1981). Pretend play in childhood: An integrative review. Child Development, 52, 1095–1118.CrossRefGoogle Scholar
Fein, G. (1987). Pretend play: Creativity and consciousness. In Gorlitz, D. & Wohlwill, J. F. (Eds.). Curiosity, imagination, and play: On the development of spontaneous cognitive motivational processes (pp. 281–304). Mahwah, NJ: Erlbaum.Google Scholar
Fernyhough, C., & Fradley, E. (2005). Private speech on an executive task: Relations with task difficulty and task performance. Cognitive Development, 20, 103–120.CrossRefGoogle Scholar
Field, T., Sandberg, D., Goldstein, S., Garcia, R., Bega-Lahr, N., Porter, K., et al. (1987). Play interactions and interviews of depressed and conduct disorder children and their mothers. Child Psychiatry and Human Development, 17, 213–233.CrossRefGoogle ScholarPubMed
Flavell, J. H. (1966). Le language privé [Private language]. Bulletin de Psychologie, 19, 698–701.Google Scholar
Friedman, N. P., & Miyake, A. (2004). The relations among inhibition and interference control functions: A latent variable analysis. Journal of Experimental Psychology: General, 133, 101–135.CrossRefGoogle ScholarPubMed
Garvey, , , C. (1991). Play. London: Fontana.Google Scholar
Gerstadt, C. L., Hong, Y. J., & Diamond, A. (1994). The relationship between cognition and action: Performance of children 3.5–7 years old on a Stroop-like day-night test. Cognition, 53, 129–153.CrossRefGoogle Scholar
Golomb, C., & Cornelius, C. B. (1977). Symbolic play and its cognitive significance. Developmental Psychology, 13, 246–252.CrossRefGoogle Scholar
Goodman, S. H. (1981). The integration of verbal and motor behavior in pre-school children. Child Development, 52, 280–289.CrossRefGoogle Scholar
Harnishfeger, K. K., & Bjorklund, D. F. (1993). The ontogeny of inhibition mechanisms: A renewed approach to cognitive development. In Howe, M. L. P. & Pasnak, R. (Eds.), Emerging themes in cognitive development (pp. 28–49). New York: Springer-Verlag.CrossRefGoogle Scholar
Harris, P. L., & Kavanaugh, R. D. (1993). Young children's understanding of pretense. Monograph of the Society for Research in Child Development, 58(1, Serial No. 231).CrossRefGoogle Scholar
Hobson, P. (2002). The cradle of thought: Explorations of the origins of thinking. London: Macmillan.Google Scholar
Hongwanishkul, D., Happaney, K., Lee, W., & Zelazo, P. (2005). Assessment of hot and cool executive function in young children: Age-related changes and individual differences. Developmental Neuropsychology, 28, 617–644.CrossRefGoogle ScholarPubMed
Hughes, C. (1998). Finding your marbles: Does preschoolers' strategic behavior predict later understanding of mind?Developmental Psychology, 34, 1326–1339.CrossRefGoogle Scholar
Hughes, C., & Russell, J. (1993). Autistic children's difficulty with mental disengagement from an object: Its implications for theories of autism. Developmental Psychology, 29, 498–510.CrossRefGoogle Scholar
Huttenlocher, P. R. (2002). Neural plasticity: The effect of environment on the development of cerebral cortex. Cambridge, MA: Harvard University Press.Google Scholar
Jacques, S., & Zelazo, P. D. (2001). The Flexible Item Selection Task (FIST): A measure of executive function in preschoolers. Developmental Neuropsychology, 20, 573–591.CrossRefGoogle ScholarPubMed
Jacques, S., & Zelazo, P. D. (2005). Language and the development of cognitive flexibility: Implications for theory of mind. In Astington, J. W. & Baird, J. A. (Eds.), Why language matters for theory of mind (pp. 144–162). Oxford, UK: Oxford University Press.CrossRefGoogle Scholar
Jarrold, C., Boucher, J., & Smith, P. K. (1996). Generativity deficits in pretend play in autism. British Journal of Developmental Psychology, 14, 275–300.CrossRefGoogle Scholar
Kendler, H. H., & Kendler, T. S. (1961). Effect of verbalization on reversal shifts in children. Science, 17, 1619–1620.CrossRefGoogle Scholar
Kerr, A., & Zelazo, P. D. (2004). Development of “hot” executive function: The Children's Gambling Task. Brain and Cognition, 55, 148–157.CrossRefGoogle ScholarPubMed
Kirkham, N. Z., Cruess, L. M., & Diamond, A. (2003). Helping children apply their knowledge to their behavior on a dimension-switching task. Developmental Science, 6, 449–467.CrossRefGoogle Scholar
Kochanska, G., Murray, K. T., Jacques, T. Y., Koenig, A. L., & Vandegeest, K. A. (1996). Inhibitory control in young children and its role in emerging internalization. Child Development, 67, 490–507.CrossRefGoogle ScholarPubMed
Kopp, C. B. (1982). Antecedents of self-regulation: A developmental perspective. Developmental Psychology, 18, 199–214.CrossRefGoogle Scholar
Lehto, J. E., Juujarvi, P., Kooistra, L., & Pulkkinen, L. (2003). Dimensions of executive functioning: Evidence from children. British Journal of Developmental Psychology, 21, 59–80.CrossRefGoogle Scholar
Lieber, J., & Beckman, P. J. (1991). Social coordination as a component of social competence in young children with disabilities. Focus on Exceptional Children, 24, 1–11.CrossRefGoogle Scholar
Luria, A. R. (1966). Human brain and psychological processes. New York: Harper and Row.Google Scholar
McEvoy, R., Rogers, S., & Pennington, B. (1993). Executive function and social communication deficits in young autistic children. Journal of Child Psychology and Psychiatry, 34, 563–578.CrossRefGoogle ScholarPubMed
Mead, G. H. (1934). Mind, self, & society from the standpoint of a social behaviorist (C. W. Morris, Ed.). Chicago: University of Chicago Press.Google Scholar
Metcalfe, J., & Mischel, W. (1999). A hot/cool-system analysis of delay of gratification: Dynamics of willpower. Psychological Review, 106, 3–19.CrossRefGoogle ScholarPubMed
Mischel, W., & Ebbesen, E. B. (1970). Attention in delay of gratification. Journal of Personality and Social Psychology, 16, 329–337.CrossRefGoogle Scholar
Mischel, W., Ebbesen, E. B., & Zeiss, A. R. (1972). Cognitive and attentional mechanisms in delay of gratification. Journal of Personality and Social Psychology, 16, 321–337.Google Scholar
Mischel, W., Shoda, Y., & Rodriguez, M. L. (1989). Delay of gratification in children. Science, 244, 933–938.CrossRefGoogle ScholarPubMed
Miyake, A., Friedman, N. P., Emerson, M. J., Witzki, A. H., Howerter, A., & Wager, T. D. (2000). The unity and diversity of executive functions and their contributions to complex “frontal lobe” tasks: A latent variable analysis. Cognitive Psychology, 41, 49–100.CrossRefGoogle ScholarPubMed
Murray, K. T., & Kochanska, G. (2002). Effortful control: Relation to externalizing and internalizing behaviors and factor structure. Journal of Abnormal Child Psychology, 30, 503–514.CrossRefGoogle ScholarPubMed
Nelson, C. A., & Luciana, M. (Eds.). (2001). Handbook of developmental cognitive neuroscience. Cambridge, MA: MIT Press.Google Scholar
Newman, L. S. (1990). Intentional and unintentional memory in young children: Remembering vs. playing. Journal of Experimental Child Psychology, 50, 243–258.CrossRefGoogle ScholarPubMed
Ozonoff, S., Pennington, B., & Rogers, S. (1991). Executive function deficits in high functioning autistic individuals: Relationship to theory of mind. Journal of Child Psychology and Psychiatry, 32, 1081–1105.CrossRefGoogle ScholarPubMed
Passler, M. A., Isaac, W., & Hynd, G. W. (1985). Neuropsychological development of behavior attributed to frontal lobe functioning in children. Developmental Neuropsychology, 1, 349–370.CrossRefGoogle Scholar
Peake, P., Hebl, M., & Mischel, W. (2002). Strategic attention deployment for delay of gratification in working and waiting situations. Developmental Psychology, 38, 313–326.CrossRefGoogle ScholarPubMed
Pennington, B. F. (1997). Dimensions of executive functions in normal and abnormal development. In Krasnegor, N., Lyon, G. R., & Goldman-Rakic, P. S. (Eds.), Prefrontal cortex: Evolution, development, and behavioral neuroscience (pp. 265–281). Baltimore, MD: Paul Brookes.Google Scholar
Posner, M. I., & Rothbart, M. K. (1998). Attention, self-regulation, and consciousness. Philosophical Transactions of the Royal Society of London B, 353, 1915–1927.CrossRefGoogle ScholarPubMed
Reed, M., Pien, D. L., & Rothbart, M. K. (1984). Inhibitory self-control in preschool children. Merrill-Palmer Quarterly, 30, 131–147.Google Scholar
Rodriguez, M. L., Mischel, W., & Shoda, Y. (1989). Cognitive person variables in the delay of gratification of older children at risk. Journal of Personality and Social Psychology, 57, 358–367.CrossRefGoogle ScholarPubMed
Saltz, E., Dixon, D., & Johnson, , , J. (1977). Training disadvantaged preschoolers on various fantasy activities: Effects on cognitive function and impulse control. Child Development, 48, 367–380.CrossRefGoogle ScholarPubMed
Sethi, A., Mischel, W., Aber, L., Shoda, Y., & Rodriguez, M. (2000). The role of strategic attention deployment in development of self-regulation: Predicting preschoolers' delay of gratification from mother-toddler interactions. Developmental Psychology, 36, 767–777.CrossRefGoogle ScholarPubMed
Shallice, T. (1988). From neuropsychology to mental structure. Cambridge, UK: Cambridge University Press.CrossRefGoogle Scholar
Shoda, Y., Mischel, W., & Peake, P. (1990). Predicting adolescent cognitive and self-regulatory competencies from preschool delay of gratification: Identifying diagnostic conditions. Developmental Psychology, 26, 978–986.CrossRefGoogle Scholar
Sigel, I. E. (1970). The distancing hypothesis: A causal hypothesis for the acquisition of representational thought. In Jones, M. R. (Ed.), Miami symposium on the prediction of behavior, 1968: Effect of early experiences (pp. 99–118). Coral Gables, FL: University of Miami Press.Google Scholar
Sigel, I. E. (1993). The centrality of a distancing model for the development of representational competence. In Cocking, R. R. & Renninger, K. A. (Eds.), The development and meaning of psychological distance (pp. 141–157). Hillsdale, NJ: Erlbaum.Google Scholar
Sigman, M., & Ungerer, J. (1981) Sensorimotor skill and language comprehension in autistic children. Journal of Abnormal Child Psychology, 9, 149–165.CrossRefGoogle Scholar
Singer, J. L. (1961). Imagination and waiting ability in young children. Journal of Personality, 29, 396–413.CrossRefGoogle ScholarPubMed
Singer, J. L., & Herman, J. (1954). Motor and fantasy correlates of Rorschach human movement responses. Journal of Consulting Psychology, 18, 325–331.CrossRefGoogle ScholarPubMed
Singer, J. L., & Schonbar, R. A. (1961). Correlates of daydreaming: A dimension of self awareness. Journal of Consulting Psychology, 25, 1–6.CrossRefGoogle Scholar
Singer, D. G., & Singer, J. L. (1990). The house of make-believe: Children's play and developing imagination. Cambridge, MA: Harvard University Press.Google Scholar
Strayhorn, J. M. (2002). Self-control: Theory and research. Journal of the American Academy of Child and Adolescent Psychiatry, 41, 7–16.CrossRefGoogle ScholarPubMed
Stuss, D. T., & Benson, D. F. (1986). The frontal lobes. New York: Raven Press.Google Scholar
Stuss, D. T., & Knight, R. T. (Eds.). (2002). Principles of frontal lobe function. New York: Oxford University Press.CrossRefGoogle Scholar
Taylor, M. (1999). Imaginary companions and the children who create them. New York: Oxford University Press.Google Scholar
Taylor, M., & Carlson, S. M. (1997). The relation between individual differences in fantasy and theory of mind. Child Development, 68, 436–455.CrossRefGoogle ScholarPubMed
Taylor, M., Carlson, S. M., Maring, B. L., Gerow, L., & Charley, C. M. (2004). The characteristics and correlates of fantasy in school-age children: Imaginary companions, impersonation, and social understanding. Developmental Psychology, 40, 1173–1187.CrossRefGoogle ScholarPubMed
Vaughn, B. E., Kopp, C. B., Krakow, J. B., Johnson, K., & Schwartz, S. S. (1986). Process analyses of the behavior of very young children in delay tasks. Developmental Psychology, 22, 752–759.CrossRefGoogle Scholar
Vygotsky, L. S. (1987). Thinking and speech. In The collected works of L. S. Vygotsky (Vol. 1, pp. 37–285). New York: Plenum. (Original work published 1934)Google Scholar
Welsh, M. C., Pennington, B. F., & Groisser, D. B. (1991). A normative-developmental study of executive function: A window on prefrontal function in children. Developmental Neuropsychology, 7, 131–149.CrossRefGoogle Scholar
Welsh, M. C., Pennington, B. F., Ozonoff, S., Rouse, B., & McCabe, E. R. B. (1990). Neuropsychology of early-treated phenylketonuria: Specific executive function deficits. Child Development, 61, 1697–1713.CrossRefGoogle ScholarPubMed
Werner, H., & Kaplan, B. (1963). Symbol formation: An organismic-developmental approach to language and the expression of thought. New York: Wiley.Google Scholar
Winsler, A., Díaz, R. M., McCarthy, E. M., Atencio, D., & Chabay, L. A. (1999). Mother-child interaction, private speech, and task performance in preschool children with behavior problems. Journal of Child Psychology and Psychiatry and Allied Disciplines, 40, 891–904.CrossRefGoogle ScholarPubMed
Zelazo, P. D. (2004). The development of conscious control in childhood. Trends in Cognitive Sciences, 8, 12–17.CrossRefGoogle ScholarPubMed
Zelazo, P. D., & Müller, U. (2002). Executive function in typical and atypical development. In Goswami, U. (Ed.), Handbook of childhood cognitive development (pp. 445–469). Oxford, UK: Blackwell.CrossRefGoogle Scholar
Zelazo, P. D., Müller, U., Frye, D., & Markovitch, S. (2003). The development of executive function in early childhood. Monographs of the Society for Research in Child Development, 68(3, Serial No. 274).CrossRefGoogle ScholarPubMed

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