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Head-Trunk Relation Before and During a Turn: the Effect of Turn Angle

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons84232

Sreenivasa,  M
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons83920

Frissen,  I
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84228

Souman,  JL
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons83906

Ernst,  MO
Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Sreenivasa, M., Frissen, I., Souman, J., & Ernst, M. (2007). Head-Trunk Relation Before and During a Turn: the Effect of Turn Angle. Poster presented at 10th Tübinger Wahrnehmungskonferenz (TWK 2007), Tübingen, Germany.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-CCE1-9
Abstract
During walking the behavior of the head and trunk are closely coupled. This becomes particularly clear while taking a turn. Here, we investigate this coupling during two phases of turning, before and during. Before a turn people make anticipatory orientations of the head into the direction of the turn. Previous research suggests that this anticipation occurs at a constant distance before the curve for different walking speeds. However, in most studies participants only performed 90 turns. We tested whether anticipation distance is invariant across different turn angles. As the turn progresses the head continues to look further into the turn than the trunk, and slowly converging towards the end of turn. An additional question here is the dependence of relative yaw between head and trunk on the turn angle. To answer these questions we measured head-trunk angles across a range of different turn angles. Participants followed predefined paths around obstacles with the radius of turn indicated by circles drawn on the floor. Turning angles ranged from 45 to 180 in steps of 45. The position and orientation of both the head and trunk were measured using an optical tracking system. Two parameters were calculated from the data: head anticipation and maximum relative yaw. Head anticipation is the distance in space where the head starts to look into the upcoming turn. Maximum relative yaw is the maximum difference occurring between the yaw angle of the head and the trunk during a turn. Both head anticipation and maximum relative yaw increased with turn angle, although maximum relative yaw leveled off after 135. In a second experiment, participants followed the same paths as in Experiment 1, but were not constrained in the turn radius. Results showed that turn radius decreased with increasing turn angle. Nevertheless, we found the same pattern of results as in Experiment 1. In conclusion, the relation between head and trunk both before and during a turn is dependent on the angle of turn one is about to make.