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  Optic flow velocity profiles influence heading and speed discrimination

Butler, J., MacNeilage, P., Campos, J., & Bülthoff, H. (2007). Optic flow velocity profiles influence heading and speed discrimination. Poster presented at 30th European Conference on Visual Perception (ECVP 2007), Arezzo, Italy.

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 Creators:
Butler, JS1, 2, Author           
MacNeilage, P, Author           
Campos, J1, 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: It is usually assumed that the human visual system is most sensitive to the velocity of motion at
the retina. However, two optic flow velocity profiles that specify the same peak velocity can have
different durations and specify very different accelerations and displacements of the observer.
We compare heading and velocity discrimination in response to constant and raised cosine optic
flow velocity profiles. The experiment was divided into four separate blocks, heading discrimination
and velocity discrimination, with constant and raised cosine velocity profiles. On each trial, subjects
were presented with two consecutive movements (same velocity profile) through a limited lifetime
3-D star field and asked to indicate which motion was more to the right (heading discrimination)
or which had a faster maximum velocity (velocity discrimination). The heading experiments show
there is not a consistent preference of motion profile within the group but individual subject‘s
thresholds are significantly different between motion profile conditions. The different profiles in the
velocity experiments did not show as clear a pattern of results as those in the heading experiments.

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 Dates: 2007-08
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: BibTex Citekey: 5020
DOI: 10.1177/03010066070360S101
 Degree: -

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Title: 30th European Conference on Visual Perception (ECVP 2007)
Place of Event: Arezzo, Italy
Start-/End Date: 2007-08-27 - 2007-08-31

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 36 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 86 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369