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Friederici, A., & Levelt, W. J. M. (1987). Resolving perceptual conflicts: The cognitive mechanism of spatial orientation. Aviation, Space, and Environmental Medicine, 58(9), A164-A169.
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Friederici, A., & Levelt, W. J. M. (1987). Spatial description in microgravity: Aspects of cognitive adaptation. In P. R. Sahm, R. Jansen, & M. Keller (
Eds. ), Proceedings of the Norderney Symposium on Scientific Results of the German Spacelab Mission D1 (pp. 518-524). Köln, Germany: Wissenschaftliche Projektführung DI c/o DFVLR. -
Friederici, A., & Levelt, W. J. M. (1987). Sprache. In K. Immelmann, K. Scherer, & C. Vogel (
Eds. ), Funkkolleg Psychobiologie (pp. 58-87). Weinheim: Beltz. -
Levelt, W. J. M. (1987). Hochleistung in Millisekunden - Sprechen und Sprache verstehen. In Jahrbuch der Max-Planck-Gesellschaft (pp. 61-77). Göttingen: Vandenhoeck & Ruprecht.
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Levelt, W. J. M., & d'Arcais, F. (1987). Snelheid en uniciteit bij lexicale toegang. In H. Crombag, L. Van der Kamp, & C. Vlek (
Eds. ), De psychologie voorbij: Ontwikkelingen rond model, metriek en methode in de gedragswetenschappen (pp. 55-68). Lisse: Swets & Zeitlinger. -
Levelt, W. J. M., & Schriefers, H. (1987). Stages of lexical access. In G. A. Kempen (
Ed. ), Natural language generation: new results in artificial intelligence, psychology and linguistics (pp. 395-404). Dordrecht: Nijhoff. -
Levelt, W. J. M., Richardson, G., & La Heij, W. (1985). Pointing and voicing in deictic expressions. Journal of Memory and Language, 24, 133-164. doi:10.1016/0749-596X(85)90021-X.
Abstract
The present paper studies how, in deictic expressions, the temporal interdependency of speech and gesture is realized in the course of motor planning and execution. Two theoretical positions were compared. On the “interactive” view the temporal parameters of speech and gesture are claimed to be the result of feedback between the two systems throughout the phases of motor planning and execution. The alternative “ballistic” view, however, predicts that the two systems are independent during the phase of motor execution, the temporal parameters having been preestablished in the planning phase. In four experiments subjects were requested to indicate which of an array of referent lights was momentarily illuminated. This was done by pointing to the light and/or by using a deictic expression (this/that light). The temporal and spatial course of the pointing movement was automatically registered by means of a Selspot opto-electronic system. By analyzing the moments of gesture initiation and apex, and relating them to the moments of speech onset, it was possible to show that, for deictic expressions, the ballistic view is very nearly correct.
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