Attentional Actions – an Ecological-Enactive Account of Utterances of Concrete Words

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This paper proposes an ecological-enactive account of utterances of concrete words - words used to indicate observable situations, events, objects, or characteristics. Building on the education of attention model of learning, utterances of concrete words are defined as attentional actions: a repeatable form of behaviour performed by a person to indicate (i.e. point out) a particular aspect of the current situation to someone in order to achieve something. Based on recent empirical evidence on categorical colour perception, attentional actions are proposed to constrain the ongoing phenotypic reorganisation of persons into task-specific devices. The paper ends by situating the proposed account in a wider theoretical perspective on language. This paper serves two purposes: first, it undermines the scope objection against the ecological-enactive approach, and second, it provides a novel explanation for recent empirical evidence with respect to the role of language in categorical colour perception

Adolph, K. E., & Kretch, K. S. (2015). Gibson’s theory of perceptual learning. International Encyclopedia of the Social & Behavioral Sciences, Second Edition, 2015, 127-134. doi: 10.1016/B978-0-08-097086-8.23096-1

Anderson, M. L. (2003). Embodied cognition: A field guide. Artificial Intelligence, 149(1), 91-130. doi: 10.1016/S0004-3702(03)00054-7

Anderson, M. L. (2014). After phrenology: Neural reuse and the interactive brain. Cambridge, MA.: The MIT Press.

Anderson, M. L. (2016). Précis of after phrenology: Neural reuse and the interactive brain. Behavioral and Brain Sciences, 39, 1-45. doi: 10.1017/ S0140525X15000631

Andrick, G., & Tager-Flusberg, H. (1986). The acquisition of colour terms. Journal of Child Language, 13(1), 119-134. doi: 10.1017/S030500090000 0337

Athanasopoulos, P., Wiggett, A., Dering, B., Kuipers, J., & Thierry, G. (2009). The Whorfian mind. Electrophysiological evidence that language shapes perception. Journal Communicative & Integrative Biology, 2(4), 332-334. doi: 10.4161/cib.2.4.8400

Aristotle (1975). Categories and De Interpretatione. J.L. Ackrill (Trans.). Oxford: Clarendon Press.

Baggs, E. (2015). A radical empiricist theory of speaking: Linguistic meaning without conventions. Ecological Psychology, 27(3), 251-264. doi: 10.1080/10407413.2015.1068655

Bakhtin, M. M. (1982). The dialogical imagination (C. Emerson & M. Holquist, Trans.). University of Texas Press.

Berlin, B., & Kay, P. (1969). Basic color terms: Their universality and evolution. California, CA: University of California Press.

Bingham, G. P. (1988) Task-specific devices and the perceptual bottleneck. Human Movement Science, 2(2-4), 225-264. doi: 10.1016/0167- 9457(88)90013-9

Boutonnet, B., Dering, B., Viñas-Guasch, N., & Thierry, G. (2013). Seeing objects through the language glass. Journal of Cognitive Neuroscience, 25(10), 1702-1710. doi: 10.1162/jocn_a_00415 Brooks, R. (1991). Intelligence without representation. Artificial Intelligence, 47, 139 - 159.

Bruineberg, J., & Rietveld, E. (2014). Self-organization, free energy minimization, and optimal grip on a field of affordances, Frontiers in Human Neuroscience, 8(599), 1-14. doi: 10.3389/fnhum.2014.00599

Bruineberg, J., Kiverstein, J., & Rietveld, E. (2016). The anticipating brain is not a scientist: the free-energy principle from an ecological-enactive perspective. Synthese, 1-28. doi: 10.1007/s11229-016-1239-1

Bruner, J. (1990). Acts of meaning. Cambridge, MA: Harvard University Press. Cairns, H. & Cairns, C. (1976) Psycholinguistics. New York, NY: Holt, Rinehart & Winston.

Chemero, A. (2009). Radical embodied cognitive science. Cambridge, MA: The MIT Press.

Christiansen, M. H., & Chater, N. (2016). The now-or-never bottleneck: A fundamental constraint on language. Behavioural and Brain Sciences, 1-27. doi: 10.1017/S0140525X1500031X

Clark, A. (1996). Linguistic anchors in the sea of thought? Pragmatics & Cognition, 4(1), 93-103. doi: 10.1075/pc.4.1.09cla

Clark, A. (1997). Being there. Cambridge, MA.: The MIT Press.

Clark, A., & Toribio, J. (1994). Doing without representing? Synthese, 101, 401-431.

Clark, E. V. (1981). Acquisitional principles in lexical development. In: S.A. Gelman & J.P. Byrnes (Eds.), Perspectives on language and thought interrelations in development (pp. 31-71). Cambridge: Cambridge University Press.

Clark, E. V. (2009). First language acquisition. Second edition. Cambridge: Cambridge University Press. Cowley, S. J. (2011a). Distributed language. In: Cowley, S. (Ed.), Distributed language (pp. 185-210). Amsterdam/Philadelphia, PA: John Benjamins.

Cowley, S. J. (2011b). Taking a language stance. Ecological Psychology, 23, 1-25. doi: 10.1080/10407413.2011.591272

Cuffari, E. C., Di Paolo, E., & De Jaegher, H. (2015). From participatory sense-making to language: there and back again. Phenomenology and the Cognitive Sciences, 14(4), 1089-1125. doi: 10.1007/s11097-014-9404-9

Cruse, D. A. (2017). The Lexicon. In: M. Aronoff & J. Rees-Miller (Eds.), The handbook of linguistics 2nd edition (pp. 235-254). Oxford: Wiley Blackwell. Davidoff, J., & Luzzatti, C. (2005). Language impairment and colour categories. Behavioral and Brain Sciences, 28(4), 494-495. doi: 10.1017/ S0140525X05280081/

Davidoff, J., & Roberson, D. (2004) Preserved thematic and impaired taxonomic categorisation: A case study. Language and Cognitive Processes, 19(1), 137-174. doi: 10.1080/01690960344000125

Davidson, D., 1986. A nice derangement of epitaphs. In E. Lepore (Ed.), Truth and Interpretation: Perspectives on the Philosophy of Donald Davidson (pp. 433-446). Oxford: Blackwell.

Davis, H.G., Taylor, T. J. (Eds.). (1990). Redefining linguistics. London/New York, NY: Routledge. Davis, H.G., Taylor, T. J. (Eds.). (2003). Rethinking linguistics. London/New York, NY RoutledgeCurzon.

Degenaar, J., & Myin, E. (2014). Representation hunger reconsidered. Synthese, 191, 3639-3648. doi: 10.1007/s11229-014-0484-4

Devitt, M. (2006). Ignorance of language. Oxford: Clarendon Press.

De Haan, S., Rietveld, E., Stokhof, M., & Denys, D. (2013) The phenomenology of deep brain stimulation-induced changes in obsessive-compulsive disorder patients: An enactive affordance-based model. Frontiers in Human Neuroscience, 7, 1-14. doi: 10.3389/fnhum.2013. 00653

De Saussure, F. (2011). Cours de linguistique generale (W. Baskin, Trans.). New York, NY: Columbia University Press. (Original work published in 1922).

Drivonikou, G. V., Kay, P., Regier, T., Ivry, R. B., Gilbert, A. L., Franklin, A., & Davies, I. R. L., (2007). Further evidence that Whorfian effects are stronger in the right visual field than the left. PNAS, 104(3), 1097-1102. doi: 10.1073/pnas.0610132104

Dummett, M. (1975). Wang’s paradox. Synthese, 3(4), 201-232. doi: 10.1007/ BF00485048

Engel, K., Maye, A., Kurthen, M., & König, P. (2013). Where’s the action? The pragmatic turn in cognitive science. Trends in Cognitive Sciences, 17(5), 202-209. doi: 10.1016/j.tics.2013.03.006 Fenson, L., Dale, P. S., Reznick, S. J., Bates, E., Thal, D. J ., & Pethick, S. J. (1994). Variability in early communicative development. Monographs of the Society for Research in Child Development, 59, (5, serial No. 242).

Fodor, J. A., (1975). The language of thought. Cambridge, MA: Harvard University Press.

Fodor, J. A. (2008). LOT 2: The language of thought revisited. Oxford: Oxford University Press. Franklin, A., Drivonikou, G. V., Clifford, A., Kay, P., Regier, T., Davies, I. R. L. (2008). Lateralization of categorical perception of color changes with color term acquisition. PNAS, 105(47), 18221-18225. doi: 10.1073/ pnas.0809952105 Franklin, A., Drivonikou, G. V., Bevis, L., Davies, I. R. L., Kay, P., Regier, T. (2008). Categorical perception of color is lateralized to the right hemisphere in infants, but to the left hemisphere in adults. PNAS, 105(9), 3221-3225. doi:10.1073/pnas.0712286105

Gallagher, S. (2015). Seeing things in the right way: How social interaction shapes perception. In D. Maxime and Th. Breyer (Eds.), Normativity in perception (pp. 117-127). London: Palgrave Macmillan.

Gibson, E. J. (1953). Improvement in perceptual judgments as a function of controlled practice or training. Psychological Bulletin, 50, 401-431.

Gibson, E.J. (1963). Perceptual learning. Annual Review of Psychology, 14, 29- 59. Gibson, E. J. & Rader, N. (1979). Attention - The perceiver as performer. In G. Hale (Ed.), Attention and cognitive development (pp. 1-21). New York, NY: Plenum Press. Gibson, J. J. (1966). The senses considered as perceptual systems. Boston, MA: Houghton Mifflin.

Gibson, J. J. (1977). The theory of affordances. In R. Shaw & J. Bransford (Eds.), Perceiving, acting, and knowing: toward an ecological psychology (pp. 67-82). Hillsdale, NJ: Lawrence Erlbaum.

Gibson, J. J. (1979). The ecological approach to visual perception. Boston, MA: Houghton Mifflin. Gilbert, A. L., Regier, T., Kay, P., & Ivry, R. B. (2006). Whorf hypothesis is supported in the right visual field but not the left. PNAS, 103(2), 489-494. doi: 10.1073/pnas.0509868103

Gilbert, A. L., Regier, T., Kay, P., & Ivry, R. B. (2008). Support for lateralization of the Whorf effect beyond the realm of color discrimination. Brain and Language, 105(2), 91-98. doi: 10.1016/j.bandl.2007.06.001

Harris, R. (1980). The language-makers. London: Duckworth. Harris, R. (1990). On redefining linguistics. In H. Davis & T. J. Taylor (Eds.), Redefining Linguistics. London/New York, NY: Routledge.

Harris, R. (1998). Introduction to integrational linguistics. Pergamon, Oxford. Harvey, M. I. (2015). Content in languaging: why radical enactivism is incompatible with representational theories of language. Language Sciences, 48, 90-129. Haugeland, J. (2013). Dasein disclosed. Cambridge, MA.: The Harvard University Press.

Hurley, S. (1998). Consciousness in action. Cambridge, MA: Harvard University Press.

Hutto, D. D., & Myin, E. (2013). Radicalizing enactivism. Basic minds without content. Cambridge, MA.: The MIT Press.

Hutto, D. D., & Myin, E. (2017). Evolving enactivism: Basic minds meet content. Cambridge, MA.: The MIT Press. Ingold, T. (2001). From the transmission of representation to the education of attention. In: H. Whitehouse (Ed.), The debated mind: Evolutionary psychology versus ethnography (pp. 113-153). New York, NY: Berg. Jackendoff, R. (1996). How language helps us thinks. Pragmatics & Cognition, 4(1), 1-34. doi: 10.1075/pc.4.1.03jac

Ježek, E. (2016). The lexicon: An introduction. Oxford: Oxford University Press.

Kiverstein, J. & Clark, A. (2009) Introduction: Mind embodied, embedded, enacted: One church or many? Topoi, 28, 1-7. doi: 10.1007/s11245-008- 9041-4

Kiverstein, J. & Rietveld, E. (2018). Reconceiving representation-hungry cognition: an ecological-enactive proposal. Adaptive Behavior, 1-17. doi: 10.1177/105971231877277

Kravchenko, A. V. (2007). Essential properties of language, or, why language is not a code. Language Sciences, 29, 650-671. doi: 10.1016/j.langsci. 2007.01.004

Kravchenko, A. V. (2009). The experiental basis of speech and writing as different cognitive domains. Pragmatics & Cognition, 17(3), 527-548. doi: 10.1075/ p&c.17.3.03kra

Kukla, R. (2017). Ostension and assertion. In: Z. Adams and J. Browning (Eds.) Giving a damn - Essays in dialogue with John Haugeland (pp. 103-130). Cambridge, MA: The MIT Press.

Linell, P. (2005). The written language bias in linguistics: Its nature, origins and transformations. London: Routledge.

Locke, J. (2004). An essay concerning human understanding. R. Woolhouse (Ed.). London: Penguin Books. (Original work published in 1690)

Love, N. (1990). The locus of languages in a redefined linguistics. In: H. G. Davis & T. J. Taylor (Eds.), Redefining Linguistics (pp. 53-118). London/ New York, NY: Routledge.

Love, N. (2004). Cognition and the language myth. Language Sciences, 26, 525- 544. doi: 10.1016/j.langsci.2004.09.003

Love, N. (2007). Are languages digital codes? Language Sciences, 29, 690-709. doi: 10.1016/j.langsci.2007.01.008

Love, N. (2017). On languaging and languages. Language Sciences, 61, 1-35. doi: 10.1016/j.langsci.2017.04.001

Lupyan, G. (2012). Linguistically modulated perception and cognition: the label-feedback hypothesis. Frontiers in Psychology. doi: 10.3389/fpsyg.2012.00054

Lupyan, G. (2016). The centrality of language in human cognition. Language Learning, 66(3), 516-553. doi: 10.1111/lang.12155

LupyanG., & Spivey, M.J. (2010). Redundant spoken labels facilitate perception of multiple items. Attention, Perception, & Psychophysics, 72(8), 2236- 2253. doi: 10.3758/BF03196698

Lupyan, G. & Swingley, D. (2012). Self-directed speech affects visual search performance. The Quarterly Journal of Experimental Psychology, 65(6), 1068-1085. doi: 10.1080/17470218.2011.647039

Markman, E.M. (1981). The whole-object, taxonomic, and mutual exclusivity assumptions as initial constraints on word meanings. In: S. A. Gelman & J. P. Byrnes (Eds.), Perspectives on language and thought Interrelations in development, 72-107. Cambridge: Cambridge University Press.

Maturana, H. R. (1978). Biology of language: The epistemology of reality. In: Miller, G. A. & Lenneberg, E. (Eds.), Psychology and Biology of Language and Thought. New York, NY: Academic Press.

Matthews, R., (2003). Does linguistic competence require knowledge of language? In: Barber, A. (Ed.), Epistemology of Language (pp. 187-213). Oxford University Press, Oxford.

Myin, E. (2016). Perception as something we do. Journal of Consciousness Studies, 23(5-6), 80-104.

Noë, A. (2012). Varieties of presence. Cambridge, MA: Harvard University Press.

Ong, W. J. (1982). Orality and literacy. London/New York, NY: Routledge. O’Regan, J. K. & Noë, A. (2001). A sensorimotor account of vision and visual consciousness. Behavioral and Brain Sciences, 24(5), 883-917. doi: 10. 1017/S0140525X01000115

Papafragou, A. (2005). Relations between language and thought: Individuation and the count/mass distinction. In H. Cohen & C. Lefebvre (Eds.), Handbook of Categorization in Cognitive Science (pp. 256-272). Oxford: Elsevier.

Pilling, M., Wiggett, A., Özgen, E., & Davies, I.R.L. (2003). Is color “categorical perception” really perceptual? Memory & Cognition, 31(4), 538-551. doi: 10.3758/BF03196095

Pinker, S. (1994). The language instinct: How the mind creates language. New York, NY: William Morrow and Company.

Pinker, S. (2007). The stuff of thought: Language as a window into human nature. London: Penguin.

Pitchford, N. J. & Mullen, K. T. (2002). Is the acquisition of basic-colour terms in young children constrained? Perception, 31, 1349-1370. doi: 10.1068/p3405

Proffitt, D. R., & Linkenauger, S. A. ( 2013 ). Perception viewed as a phenotypic expression. In: W. Prinz, M. Beisert, & A. Herwig (Eds.), Action science: Foundations of an emerging discipline (pp. 171 - 197). Cambridge, MA : MIT Press.

Quine, W. V. O. (1960). Word and object. Cambridge, MA.: The MIT Press. Rączaszek-Leonardi, J. (2009). Symbols as constraints: The structuring role of dynamics and self-organization in natural language. Pragmatics & Cognition, 17(3), 653-676.

Rączaszek-Leonardi, J. (2011). Language as a system of replicable constraints. In H. Pattee (Ed.), Laws, language and life: Howard Pattee's classic papers on the physics of symbols (pp. 295-333). Dordrecht: Springer.

Rączaszek-Leonardi, J. (2016) How does a word become a message? An illustration on a developmental time-scale. New Ideas in Psychology, 42, 46-55. doi: 10.1016/j.newideapsych.2015.08.001

Rączaszek-Leonardi, J., & Kelso, J. A. S. (2008). Reconciling symbolic and dynamic aspects of language: Toward a dynamic psycholinguistics. New Ideas in Psychology, 26(2), 193-207.

Rączaszek-Leonardi, J., Nomikou, I., & Rohlfing, K. J. (2013). Young children's dialogical actions: the beginnings of purposeful intersubjectivity. IEEE Transactions on Autonomous Mental Development, 5(3), 210-221. doi: 10.1109/TAMD.2013.2273258.

Reddy, M. J. (1993). The conduit metaphor: A case of frame conflict in our language about language. In A. Ortony (Ed.), Metaphor and Thought (2nd Edition) (pp. 164-201). Cambridge, MA: Cambridge University Press.

Reed, E. S. (1995). The ecological approach to language development: A radical solution to Chomsky's and Quine's problems. Language & Communication, 15(1), 1-29. doi: 10.1016/0271-5309(94)E0010-9

Reed, E. S. (1996). Encountering the world: Toward an ecological psychology (1st ed.). New York, NY: Oxford University Press.

Regier, T. & Kay, P. (2009). Language, thought, and color: Whorf was half right. Trends in Cognitive Science, 13(10), 439-446. doi: 10.1016/j.tics. 2009.07.001

Rietveld, E. & Kiverstein, J. (2014). A rich landscape of affordances. Ecological Psychology, 26(4), 325-352. doi: 10.1080/10407413.2014. 958035

Roberson, D. & Davidoff, J. (2000). The categorical perception of colors and facial expressions- the effect of verbal interference. Memory & Cognition, 28(6), 977-986. doi: 10.3758/BF03209345

Roberson, D., Davidoff, J., Davies, I. R. L., & Shapiro, L. R. (2005). The development of color categories in two languages: A longitudinal study. Journal of Experimental Psychology: General, 133(4), 554-571. doi: 10.1037/0096-3445.133.4.554

Roberson, D., Davies, I. R. L., & Davidoff, J., (2000). Color categories are not universal: Replications and new evidence from a stone-age culture. Journal of Experimental Psychology: General, 129(3), 369-398. doi: 10.1037//10 096-3445.129.3.369

Rosch Heider, E., & Olivier, D. C. (1972). The structure of the color space in naming and memory for two languages. Cognitive Psychology, 3, 337-354.

Runeson, S. (1977).On the possibility of “smart” perceptual mechanisms. Scandinavian Journal of Psychology, 18, 172-179.

Ryle, G. (1945a). Knowing how and knowing that. Proceedings of the Aristotelian Society, New Series, 46, 1-16.

Ryle, G. (1945b) Philosophical arguments. In G. Ryle (2009) Collected Essays 1929-1968, 203-221. New York, NY: Routledge.

Ryle, G. (2009). The concept of mind 60th anniversary edition. J. Tanney (Ed.). London/New York, NY: Routledge. (Original work published in 1949)

Stewart, J. (2010). Foundational issues in enaction as a paradigm for cognitive science: From the origin of life to consciousness and writing. In J. Stewart, O. Gapenne, & E. Di Paolo (Eds.), Enaction: Towards a New Paradigm for Cognitive Science (pp. 1-32). Cambridge, MA: The MIT Press.

Suegami, T., Aminihajibashi, S., & Laeng, B. (2014). Another look at category effects on colour perception and lateralisation. Cognitive Processing, 15(2), 217-226. doi: 10.1007/s10339-013-0595-8

Tanney, J. (2015) Gilbert Ryle. The Stanford encyclopedia of philosophy (Spring 2015 Edition), E. N. Zalta (Ed.), URL = .

Taylor, T. J. (1990). Normativity and linguistic form. In H. G. Davis & T. J. Taylor (Eds.), Redefining Linguistics (pp. 118-148). London/New York, NY: Routledge.

Taylor, T. J. (1992). Mutual misunderstanding: Scepticism and the theorizing of language and interpretation. Durham, NC/London: Duke University Press/ Routledge.

Taylor, T. J. (2000). Language constructing language: the implications of reflexivity for linguistic theory. Language Sciences, 22, 483-499. doi: 10.1016/S0388-0001(00)00016-4

Taylor, T. J. (2010). Where does language come from? The role of reflexive enculturation in language development. Language Sciences, 32, 14-27. doi: 10.1016/j.langsci.2008.12.014

Taylor, T. J. (2013). Calibrating the child for language: Meredith Williams on a Wittgensteinian approach to language socialization. Language Sciences, 40, 308-320. doi: 10.1016/j.langsci.2013.07.002

Thelen, E., & Smith, L. B. (1994). A dynamic systems approach to the development of cognition and action. Cambridge, MA: MIT Press.

Thierry, G., Athanasopoulos, P., Wigget, A., Dering, B., & Kuipers, J. (2009). Unconscious effects of language-specific terminology on preattentive color perception. PNAS, 106(11), 4567-4570. doi: 10.1073/pnas.0811155106

Turvey, M. T., Shaw, R., Reed, E., & Mace, W. (1981). Ecological laws of perceiving and acting: In reply to Fodor and Pylyshyn. Cognition, 9, 237- 304.

Van den Herik, J. C. (2017). Linguistic know-how and the orders of language. Language Sciences, 61, 17-27. doi: 10.1016/j.langsci.2016.09.009

Van Dijk, L., Withagen, R., & Bongers, R. M. (2015). Information without content: A Gibsonian reply to enactivists’ worries. Cognition, 134, 210-214. doi: 10.1016/j.cognition.2014.10.012

Van Elk, M., Slors, M., & Bekkering, H. (2010). Embodied language comprehension requires an enactivist paradigm of cognition. Frontiers in Psychology, 1(234), 1-9. doi: 10.3389/fpsyg.2010.00234

Van Gelder, T. (1998). The dynamical hypothesis in cognitive science. Behavioral and Brain Sciences, 21, 615-628.

Varela, F. J., Thompson, E., Rosch, E., (1991). The embodied mind: cognitive science and human experience. Cambridge, MA: The MIT Press.

Verbrugge, R. R. (1985). Language and event perception: steps toward a synthesis. In W. H. Warren, & R. E. Shaw (Eds.), Persistence and change. Proceedings of the first international conference on event perception (pp. 157-194). Hillsdale, NJ: Lawrence Earlbaum Associates.

Voloshinov, V.N. (1930/1973). Marxism and the philosophy of language (L. Matejka & I. R. Titunik, Trans.). New York, NZ/London: Seminar Press.

Whitehead, A. N. (1929). Process and reality. New York, NZ: Harper.

Wilson, A. D., & Golonka, S. (2013). Embodied cognition is not what you think it is. Frontiers in Psychology, 4, 1-13. doi: 10.3389/fpsyg.2013.00058

Wilson, M. (2002). Six views of embodied cognition. Psychonomic Bulletin & Review, 9(4), 625-636. doi: 10.3758/BF03196322

Winawer, J., Witthoft, N., Frank, M. C., Wu, L., Wade, A. R., & Boroditsky, L. (2007). Russian blues reveal effects of language on color discrimination. PNAS, 104(19), 7780-7785. doi: 10.1073/pnas.0701644104

Wittgenstein, L. (1953/2009). Philosophical investigations (Revised 4th ed.). Oxford: Wiley-Blackwell.

Zhu, Q., & Bingham, G. P. (2010). Learning to perceive the affordance for long-distance throwing: smart mechanism or function learning? Journal of Experimental Psychology: Human Perception and Performance, 36(4), 862-875. doi: 10.1037/a0018738

Zukow-Goldring, P. & Ferko, K. R. (1994). An ecological approach to the emergence of the lexicon: Socializing attention. In V. John-Steiner, C. Panofsky, & L. Smith (Eds.), Sociocultural approaches to language and literacy: an interactionist perspective (pp. 170-194). Cambridge, MA: Cambridge University Press.

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