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Connecting the dots: object connectedness deceives perception but not movement planning.
Psychol Sci. 2013 Aug; 24(8):1456-65.PS

Abstract

The perceptual system parses complex scenes into discrete objects. Parsing is also required for planning visually guided movements when more than one potential target is present. To examine whether visual perception and motor planning use the same or different parsing strategies, we used the connectedness illusion, in which observers typically report seeing fewer targets if pairs of targets are connected by short lines. We found that despite this illusion, when observers are asked to make speeded reaches toward targets in such displays, their reaches are unaffected by the presence of the connecting lines. Instead, their movement plans, as revealed by their movement trajectories, are influenced by the number of potential targets irrespective of whether connecting lines are present or not. This suggests that scene parsing for perception depends on mechanisms that are distinct from those that allow observers to plan rapid and efficient target-directed movements in situations with multiple potential targets.

Authors+Show Affiliations

The Brain and Mind Institute, The University of Western Ontario, Canada.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

23765267

Citation

Milne, Jennifer L., et al. "Connecting the Dots: Object Connectedness Deceives Perception but Not Movement Planning." Psychological Science, vol. 24, no. 8, 2013, pp. 1456-65.
Milne JL, Chapman CS, Gallivan JP, et al. Connecting the dots: object connectedness deceives perception but not movement planning. Psychol Sci. 2013;24(8):1456-65.
Milne, J. L., Chapman, C. S., Gallivan, J. P., Wood, D. K., Culham, J. C., & Goodale, M. A. (2013). Connecting the dots: object connectedness deceives perception but not movement planning. Psychological Science, 24(8), 1456-65. https://doi.org/10.1177/0956797612473485
Milne JL, et al. Connecting the Dots: Object Connectedness Deceives Perception but Not Movement Planning. Psychol Sci. 2013;24(8):1456-65. PubMed PMID: 23765267.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Connecting the dots: object connectedness deceives perception but not movement planning. AU - Milne,Jennifer L, AU - Chapman,Craig S, AU - Gallivan,Jason P, AU - Wood,Daniel K, AU - Culham,Jody C, AU - Goodale,Melvyn A, Y1 - 2013/06/13/ PY - 2013/6/15/entrez PY - 2013/6/15/pubmed PY - 2014/5/3/medline KW - action KW - motor processes KW - movement planning KW - perception KW - reaching movements KW - scene parsing KW - two visual streams SP - 1456 EP - 65 JF - Psychological science JO - Psychol Sci VL - 24 IS - 8 N2 - The perceptual system parses complex scenes into discrete objects. Parsing is also required for planning visually guided movements when more than one potential target is present. To examine whether visual perception and motor planning use the same or different parsing strategies, we used the connectedness illusion, in which observers typically report seeing fewer targets if pairs of targets are connected by short lines. We found that despite this illusion, when observers are asked to make speeded reaches toward targets in such displays, their reaches are unaffected by the presence of the connecting lines. Instead, their movement plans, as revealed by their movement trajectories, are influenced by the number of potential targets irrespective of whether connecting lines are present or not. This suggests that scene parsing for perception depends on mechanisms that are distinct from those that allow observers to plan rapid and efficient target-directed movements in situations with multiple potential targets. SN - 1467-9280 UR - https://www.unboundmedicine.com/medline/citation/23765267/Connecting_the_dots:_object_connectedness_deceives_perception_but_not_movement_planning_ L2 - https://journals.sagepub.com/doi/10.1177/0956797612473485?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -