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Movement trajectories as a window into the dynamics of emerging neural representations

View ORCID ProfileRoger Koenig-Robert, View ORCID ProfileGenevieve Quek, View ORCID ProfileTijl Grootswagers, View ORCID ProfileManuel Varlet
doi: https://doi.org/10.1101/2023.03.15.532848
Roger Koenig-Robert
1The MARCS Institute for Brain, Behaviour & Development, Western Sydney University, Australia
2School of Psychology, University of New South Wales, Sydney, New South Wales, Australia
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  • For correspondence: rogkoenig@gmail.com
Genevieve Quek
1The MARCS Institute for Brain, Behaviour & Development, Western Sydney University, Australia
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Tijl Grootswagers
1The MARCS Institute for Brain, Behaviour & Development, Western Sydney University, Australia
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Manuel Varlet
1The MARCS Institute for Brain, Behaviour & Development, Western Sydney University, Australia
3School of Psychology, Western Sydney University, Australia
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Abstract

Transforming sensory inputs into meaningful neural representations is critical to adaptive behaviour in everyday environments. While non-invasive neuroimaging methods are the de-facto method for investigating neural representations, they remain expensive, not widely available, time-consuming, and restrictive in terms of the experimental conditions and participant populations they can be used with. Here we show that movement trajectories collected in online behavioural experiments can be used to measure the emergence and dynamics of neural representations with fine temporal resolution. By combining online computer mouse-tracking and publicly available neuroimaging (MEG and fMRI) data via Representational Similarity Analysis (RSA), we show that movement trajectories track the evolution of visual representations over time. We used a time constrained face/object categorization task on a previously published set of images containing human faces, illusory faces and objects to demonstrate that time-resolved representational structures derived from movement trajectories correlate with those derived from MEG, revealing the unfolding of category representations in comparable temporal detail (albeit delayed) to MEG. Furthermore, we show that movement-derived representational structures correlate with those derived from fMRI in most task-relevant brain areas, faces and objects selective areas in this proof of concept. Our results highlight the richness of movement trajectories and the power of the RSA framework to reveal and compare their information content, opening new avenues to better understand human perception.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted March 16, 2023.
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Movement trajectories as a window into the dynamics of emerging neural representations
Roger Koenig-Robert, Genevieve Quek, Tijl Grootswagers, Manuel Varlet
bioRxiv 2023.03.15.532848; doi: https://doi.org/10.1101/2023.03.15.532848
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Movement trajectories as a window into the dynamics of emerging neural representations
Roger Koenig-Robert, Genevieve Quek, Tijl Grootswagers, Manuel Varlet
bioRxiv 2023.03.15.532848; doi: https://doi.org/10.1101/2023.03.15.532848

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