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Visual illusions, delayed grasping, and memory: no shift from dorsal to ventral control.
Neuropsychologia. 2009 May; 47(6):1518-31.N

Abstract

We tested whether a delay between stimulus presentation and grasping leads to a shift from dorsal to ventral control of the movement, as suggested by the perception-action theory of Milner and Goodale (Milner, A.D., & Goodale, M.A. (1995). The visual brain in action. Oxford: Oxford University Press.). In this theory the dorsal cortical stream has a short memory, such that after a few seconds the dorsal information is decayed and the action is guided by the ventral stream. Accordingly, grasping should become responsive to certain visual illusions after a delay (because only the ventral stream is assumed to be deceived by these illusions). We used the Müller-Lyer illusion, the typical illusion in this area of research, and replicated the increase of the motor illusion after a delay. However, we found that this increase is not due to memory demands but to the availability of visual feedback during movement execution which leads to online corrections of the movement. Because such online corrections are to be expected if the movement is guided by one single representation of object size, we conclude that there is no evidence for a shift from dorsal to ventral control in delayed grasping of the Müller-Lyer illusion. We also performed the first empirical test of a critique Goodale (Goodale, M.A. (2006, October 27). Visual duplicity: Action without perception in the human visual system. The XIV. Kanizsa lecture, Triest, Italy.) raised against studies finding illusion effects in grasping: Goodale argued that these studies used methods that lead to unnatural grasping which is guided by the ventral stream. Therefore, these studies might never have measured the dorsal stream, but always the ventral stream. We found clear evidence against this conjecture.

Authors+Show Affiliations

Justus-Liebig Universität, Abt. Allgemeine Psychologie, Giessen, Germany. volker.franz@psychol.uni-giessen.deNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18834894

Citation

Franz, V H., et al. "Visual Illusions, Delayed Grasping, and Memory: No Shift From Dorsal to Ventral Control." Neuropsychologia, vol. 47, no. 6, 2009, pp. 1518-31.
Franz VH, Hesse C, Kollath S. Visual illusions, delayed grasping, and memory: no shift from dorsal to ventral control. Neuropsychologia. 2009;47(6):1518-31.
Franz, V. H., Hesse, C., & Kollath, S. (2009). Visual illusions, delayed grasping, and memory: no shift from dorsal to ventral control. Neuropsychologia, 47(6), 1518-31. https://doi.org/10.1016/j.neuropsychologia.2008.08.029
Franz VH, Hesse C, Kollath S. Visual Illusions, Delayed Grasping, and Memory: No Shift From Dorsal to Ventral Control. Neuropsychologia. 2009;47(6):1518-31. PubMed PMID: 18834894.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Visual illusions, delayed grasping, and memory: no shift from dorsal to ventral control. AU - Franz,V H, AU - Hesse,C, AU - Kollath,S, Y1 - 2008/09/11/ PY - 2008/03/04/received PY - 2008/07/31/revised PY - 2008/08/31/accepted PY - 2008/10/7/pubmed PY - 2009/7/31/medline PY - 2008/10/7/entrez SP - 1518 EP - 31 JF - Neuropsychologia JO - Neuropsychologia VL - 47 IS - 6 N2 - We tested whether a delay between stimulus presentation and grasping leads to a shift from dorsal to ventral control of the movement, as suggested by the perception-action theory of Milner and Goodale (Milner, A.D., & Goodale, M.A. (1995). The visual brain in action. Oxford: Oxford University Press.). In this theory the dorsal cortical stream has a short memory, such that after a few seconds the dorsal information is decayed and the action is guided by the ventral stream. Accordingly, grasping should become responsive to certain visual illusions after a delay (because only the ventral stream is assumed to be deceived by these illusions). We used the Müller-Lyer illusion, the typical illusion in this area of research, and replicated the increase of the motor illusion after a delay. However, we found that this increase is not due to memory demands but to the availability of visual feedback during movement execution which leads to online corrections of the movement. Because such online corrections are to be expected if the movement is guided by one single representation of object size, we conclude that there is no evidence for a shift from dorsal to ventral control in delayed grasping of the Müller-Lyer illusion. We also performed the first empirical test of a critique Goodale (Goodale, M.A. (2006, October 27). Visual duplicity: Action without perception in the human visual system. The XIV. Kanizsa lecture, Triest, Italy.) raised against studies finding illusion effects in grasping: Goodale argued that these studies used methods that lead to unnatural grasping which is guided by the ventral stream. Therefore, these studies might never have measured the dorsal stream, but always the ventral stream. We found clear evidence against this conjecture. SN - 1873-3514 UR - https://www.unboundmedicine.com/medline/citation/18834894/Visual_illusions_delayed_grasping_and_memory:_no_shift_from_dorsal_to_ventral_control_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0028-3932(08)00365-5 DB - PRIME DP - Unbound Medicine ER -