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  Visual stimulus timing precision in Psychtoolbox-3: Tests, pitfalls and solutions

Kleiner, M. (2010). Visual stimulus timing precision in Psychtoolbox-3: Tests, pitfalls and solutions. Poster presented at 33rd European Conference on Visual Perception (ECVP 2010), Lausanne, Switzerland.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-BEF4-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-1D69-8
Genre: Poster

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 Creators:
Kleiner, M1, 2, 3, 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, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Project group: Cognitive Engineering, Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_2528702              

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 Abstract: Visual stimulation paradigms in perception research often require accurate timing for presentation of visual stimuli. Acquisition of exact stimulus update timestamps in realtime is often crucial, both for synchronization of stimulus updates between different presentation modalities and for logging. Modern graphics hardware, multi-core processors and operating systems provide a far higher level of functionality, flexibility, and performance in terms of throughput, than systems a decade ago. They also pose new challenges for precise presentation timing or timestamping. Typical causes of interference are, eg the dynamic power management of modern graphics cards and computers, novel hybrid graphics solutions, user interface desktop composition and the properties of graphics- and CPU-scheduling of the latest generation of operating systems. This work presents results for the accuracy and robustness of visual presentation timing and timestamping tests, conducted within Psychtoolbox-3 (Kleiner et al, 2007 Perception 36 ECVP Supplement, 14) on different operating systems and graphics cards under realistic stimulus presentation loads. It explains some of the common pitfalls one can encounter when trying to achieve exact timing and some methods to avoid timing problems or reduce their severeness.

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 Dates: 2010-08
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: BibTex Citekey: 6862
DOI: 10.1177/03010066100390S101
 Degree: -

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Title: 33rd European Conference on Visual Perception (ECVP 2010)
Place of Event: Lausanne, Switzerland
Start-/End Date: 2010-08-22 - 2010-08-26

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 39 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 189 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369