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  The brain weights body-based cues higher than vision when estimating walked distances

Campos, J., Byrne, P., & Sun, H. (2010). The brain weights body-based cues higher than vision when estimating walked distances. European Journal of Neuroscience: European Neuroscience Association, 31(10), 1889-1898. doi:10.1111/j.1460-9568.2010.07212.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-C032-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-76D5-9
Genre: Journal Article

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Campos, JL1, Author              
Byrne, P, Author
Sun, HJ, Author
Affiliations:
1McMaster University, ou_persistent22              

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 Abstract: Optic flow is the stream of retinal information generated when an observer’s body, head or eyes move relative to their environment, and it plays a defining role in many influential theories of active perception. Traditionally, studies of optic flow have used artificially generated flow in the absence of the body-based cues typically coincident with self-motion (e.g. proprioceptive, efference copy, and vestibular). While optic flow alone can be used to judge the direction, speed and magnitude of self-motion, little is known about the precise extent to which it is used during natural locomotor behaviours such as walking. In this study, walked distances were estimated in an open outdoor environment. This study employed two novel complementary techniques to dissociate the contributions of optic flow from body-based cues when estimating distance travelled in a flat, open, outdoor environment void of distinct proximal visual landmarks. First, lenses were used to magnify or minify the visual environment. Second, two walked distances were presented in succession and were either the same or different in magnitude; vision was either present or absent in each. A computational model was developed based on the results of both experiments. Highly convergent cue-weighting values were observed, indicating that the brain consistently weighted body-based cues about twice as high as optic flow, the combination of the two cues being additive. The current experiments represent some of the first to isolate and quantify the contributions of optic flow during natural human locomotor behaviour.

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 Dates: 2010-05
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: DOI: 10.1111/j.1460-9568.2010.07212.x
BibTex Citekey: CamposBS2010
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Title: European Journal of Neuroscience : European Neuroscience Association
  Other : Eur. J. Neurosci
Source Genre: Journal
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Publ. Info: Oxford, UK : Published on behalf of the European Neuroscience Association by Oxford University Press
Pages: - Volume / Issue: 31 (10) Sequence Number: - Start / End Page: 1889 - 1898 Identifier: ISSN: 0953-816X
CoNE: https://pure.mpg.de/cone/journals/resource/954925575988