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Generalizing the optic flow equalization control law to an asymmetrical person-plus-object system

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Abstract

Visually guided action in humans occurs in part through the use of control laws, which are dynamical equations in which optical information modulates an actor’s interaction with their environment. For example, humans locomote through the center of a corridor by equalizing the speed of optic flow across their left and right fields of view. This optic flow equalization control law relies on a crucial assumption: that the shape of the body relative to the eyes is laterally symmetrical. Humans engaging in tool use are often producing person-plus-object systems that are not laterally symmetrical, such as when they hold a tool, bag, or briefcase in one hand, or when they drive a vehicle. This experiment tests a new generalized control law for centered steering that accounts for asymmetries produced by external tool use. Participants held an asymmetrical bar and centered themselves within a virtual moving hallway while the speed of the virtual walls were systematically changed. The results demonstrate that humans engaging with an asymmetrical tool can (1) perceive the asymmetry of a person-plus-object system, (2) use that information to modulate the use of optic flow equalization control laws for centered steering, and (3) functionally incorporate the asymmetrical tool into their perception-action system to successfully navigate their environment.

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Data availability

The data for these experiments can be obtained from the first author. Email: klucait@g.clemson.edu

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Open Practices Statement

None of the data or materials for the experiments reported here is available, and none of the experiments was preregistered.

Funding

This research was not supported by any agency outside of Clemson University.

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Authors

Contributions

Katie Lucaites: Conceptualization, Methodology, Formal analysis, Investigation, Data Curation, Writing—Original Draft, Writing—Review & Editing, Visualization, Project administration. Rohith Venkatakrishnan: Software, including the creation of the virtual environment and configuring the motion tracking. Roshan Venkatakrishnan: Software, including the creation of the virtual environment and configuring the motion tracking. Christopher C. Pagano: Conceptualization, Methodology, Writing—Review & Editing, Supervision.

Corresponding author

Correspondence to Katie M. Lucaites.

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The authors have no conflicts of interest to declare.

Ethics approval

This research was approved by the Institutional Review Board (IRB) of Clemson University.

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All research participants provided written informed consent in accordance with the procedures of Clemson University’s IRB

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Lucaites, K.M., Venkatakrishnan, R., Venkatakrishnan, R. et al. Generalizing the optic flow equalization control law to an asymmetrical person-plus-object system. Atten Percept Psychophys 85, 2337–2355 (2023). https://doi.org/10.3758/s13414-023-02777-3

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  • DOI: https://doi.org/10.3758/s13414-023-02777-3

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