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Sensitivity to changes in dynamic affordances for walking on land and at sea.
PLoS One 2019; 14(10):e0221974Plos

Abstract

We investigated the perception of affordances for walking along a narrow path. We asked whether participants could perceive changes in affordances brought about by manipulation of properties of the body, or of the environment, without direct practice of the to-be-perceived affordance, and without external feedback about the accuracy of perception. In Experiment 1, participants made a series of 8 judgments of how far they could walk along a narrow path either, 1) without added weight, 2) while wearing a weighted vest, or 3) while wearing weights on their ankles. Before walking, mean judgments were lower when wearing weights than in the no-weight condition. In addition, in both weight conditions judgments changed across the series of 8 judgments, in the direction of greater accuracy. Control of the body in walking also can be influenced by motion of the ground surface, as commonly happens in vehicles. In Experiment 2, on a ship at sea, we evaluated the effects of walking with or without weight added to the body at the ankles. We again asked participants (experienced maritime crewmembers) to judge how far they could walk along a narrow path, with versus without ankle weights. As in Experiment 1, judgments made before walking mirrored the observed differences in walking performance. In addition, we again found evidence that judgment improved (without walking practice, or feedback) over the series of judgments. We conclude that participants were sensitive to (and spontaneously learned about) how affordances for walking were influenced by changes in the dynamics of body and the environment.

Authors+Show Affiliations

Affordance Perception-Action Laboratory, School of Kinesiology, University of Minnesota, Minneapolis, Minnesota, United States of America.Affordance Perception-Action Laboratory, School of Kinesiology, University of Minnesota, Minneapolis, Minnesota, United States of America.Affordance Perception-Action Laboratory, School of Kinesiology, University of Minnesota, Minneapolis, Minnesota, United States of America.Department of Psychology, Illinois State University, Normal, Illinois, United States of America.Affordance Perception-Action Laboratory, School of Kinesiology, University of Minnesota, Minneapolis, Minnesota, United States of America.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31622345

Citation

Walter, Hannah J., et al. "Sensitivity to Changes in Dynamic Affordances for Walking On Land and at Sea." PloS One, vol. 14, no. 10, 2019, pp. e0221974.
Walter HJ, Peterson N, Li R, et al. Sensitivity to changes in dynamic affordances for walking on land and at sea. PLoS ONE. 2019;14(10):e0221974.
Walter, H. J., Peterson, N., Li, R., Wagman, J. B., & Stoffregen, T. A. (2019). Sensitivity to changes in dynamic affordances for walking on land and at sea. PloS One, 14(10), pp. e0221974. doi:10.1371/journal.pone.0221974.
Walter HJ, et al. Sensitivity to Changes in Dynamic Affordances for Walking On Land and at Sea. PLoS ONE. 2019;14(10):e0221974. PubMed PMID: 31622345.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sensitivity to changes in dynamic affordances for walking on land and at sea. AU - Walter,Hannah J, AU - Peterson,Nicolette, AU - Li,Ruixuan, AU - Wagman,Jeffrey B, AU - Stoffregen,Thomas A, Y1 - 2019/10/17/ PY - 2019/04/10/received PY - 2019/08/18/accepted PY - 2019/10/18/entrez PY - 2019/10/18/pubmed PY - 2019/10/18/medline SP - e0221974 EP - e0221974 JF - PloS one JO - PLoS ONE VL - 14 IS - 10 N2 - We investigated the perception of affordances for walking along a narrow path. We asked whether participants could perceive changes in affordances brought about by manipulation of properties of the body, or of the environment, without direct practice of the to-be-perceived affordance, and without external feedback about the accuracy of perception. In Experiment 1, participants made a series of 8 judgments of how far they could walk along a narrow path either, 1) without added weight, 2) while wearing a weighted vest, or 3) while wearing weights on their ankles. Before walking, mean judgments were lower when wearing weights than in the no-weight condition. In addition, in both weight conditions judgments changed across the series of 8 judgments, in the direction of greater accuracy. Control of the body in walking also can be influenced by motion of the ground surface, as commonly happens in vehicles. In Experiment 2, on a ship at sea, we evaluated the effects of walking with or without weight added to the body at the ankles. We again asked participants (experienced maritime crewmembers) to judge how far they could walk along a narrow path, with versus without ankle weights. As in Experiment 1, judgments made before walking mirrored the observed differences in walking performance. In addition, we again found evidence that judgment improved (without walking practice, or feedback) over the series of judgments. We conclude that participants were sensitive to (and spontaneously learned about) how affordances for walking were influenced by changes in the dynamics of body and the environment. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/31622345/Sensitivity_to_changes_in_dynamic_affordances_for_walking_on_land_and_at_sea L2 - http://dx.plos.org/10.1371/journal.pone.0221974 DB - PRIME DP - Unbound Medicine ER -