Holt, N. (2006). Audio-Visual temporal integration. PHILICA.COM Observation number 15.
Audio-Visual temporal integration

Nigel Holtconfirmed userThis person has donated to Philica (Psychology, Bath Spa University)

Published in psycho.philica.com

Observation
Simple audiovisual stimuli were presented, participants were significantly more likely to identify the components as simultaneous if they have an asynchrony of approximately 50ms (Holt, 1997). This has been explained by a visual lag of the type indicated by Poppel (1988).
This relates to the more recent work on the Flash-Lag effect, and investigations are underway into neuropsychological comparisons of this psychophysical data.

Observation circumstances
As a threshold measurement in my DPhil. I wanted to find the asynchrony level participants could identify correctly as asynchronous on 75% of trials. This unexpected and very consistent result showed up as part of this measurement.

References
Holt N J (1997) Perceptual Letralisation of Audio-Visual Stimuli. Unpublished Doctoral Thesis, University of York.

Poppel, E (1988) Mindworks: Time and Conscious Experience. New York: Harcourt, Brace and Jovanovich

Information about this Observation
Peer-review ratings as of 13:03:38 on 16th Dec 2017 (from 1 review, where a score of 100 is average):
Originality = 50.00, importance = 25.00, overall quality = 50.00

Published on Monday 17th July, 2006 at 10:51:34.

Creative Commons License
This work is licensed under a Creative Commons Attribution 2.5 License.
The full citation for this Observation is:
Holt, N. (2006). Audio-Visual temporal integration. PHILICA.COM Observation number 15.

Peer review added 28th July, 2013 at 15:44:47

You might want to look into the literature on similar findings further. It doesn’t sounds like there’s anything new here yet, see Miller 1986 P&P. (now AP&P). That’s just one paper. I’ve heard that interpretation of the difference between visual and auditory perception is so that perceptual synchrony occurs at about arms length but that would be much shorter times than observed. The physics of the visual detector are much more complex and slower than the auditory one and the mind must become accustomed to sliding them around a bit to get a unified perception.




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