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  The importance of stimulus noise analysis for self-motion studies

Nesti, A., Beykirch, K., MacNeilage, P., Barnett-Cowan, M., & Bülthoff, H. (2014). The importance of stimulus noise analysis for self-motion studies. PLoS One, 9(4), 1-8. doi:10.1371/journal.pone.0094570.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-8041-D Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A8FD-0
Genre: Journal Article

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Nesti, A1, 2, Author              
Beykirch, KA1, 2, Author              
MacNeilage, PR, Author              
Barnett-Cowan, M1, 2, Author              
Bülthoff, HH1, 2, Author              
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Motion simulators are widely employed in basic and applied research to study the neural mechanisms of perception and action during inertial stimulation. In these studies, uncontrolled simulator-introduced noise inevitably leads to a disparity between the reproduced motion and the trajectories meticulously designed by the experimenter, possibly resulting in undesired motion cues to the investigated system. Understanding actual simulator responses to different motion commands is therefore a crucial yet often underestimated step towards the interpretation of experimental results. In this work, we developed analysis methods based on signal processing techniques to quantify the noise in the actual motion, and its deterministic and stochastic components. Our methods allow comparisons between commanded and actual motion as well as between different actual motion profiles. A specific practical example from one of our studies is used to illustrate the methodologies and their relevance, but this does not detract from its general applicability. Analyses of the simulatorrsquo;s inertial recordings show direction-dependent noise and nonlinearity related to the command amplitude. The Signal-to-Noise Ratio is one order of magnitude higher for the larger motion amplitudes we tested, compared to the smaller motion amplitudes. Simulator-introduced noise is found to be primarily of deterministic nature, particularly for the stronger motion intensities. The effect of simulator noise on quantification of animal/human motion sensitivity is discussed. We conclude that accurate recording and characterization of executed simulator motion are a crucial prerequisite for the investigation of uncertainty in self-motion perception.

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 Dates: 2014-04
 Publication Status: Published online
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 Rev. Method: -
 Identifiers: DOI: 10.1371/journal.pone.0094570
eDoc: e94570
BibTex Citekey: NestiBMBB2013
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Title: PLoS One
Source Genre: Journal
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Publ. Info: San Francisco, CA : Public Library of Science
Pages: - Volume / Issue: 9 (4) Sequence Number: - Start / End Page: 1 - 8 Identifier: ISSN: 1932-6203
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000277850