## Change of the ''light-from-above'' prior when the body is tilted relative to gravity

Barnett-Cowan M, Ernst MO, Bülthoff HH (2010)
In: 11th International Multisensory Research Forum (IMRF 2010).

Kurzbeitrag Konferenz / Poster | Veröffentlicht | Englisch

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Autor*in
Barnett-Cowan, M; Ernst, Marc O.UniBi; Bülthoff, H H
Stichworte
In environments where orientation is ambiguous; the visual system uses prior knowledge about lighting coming from above to recognize objects; reorient the body; and determine which way is up (where is the sun?). It has been shown that when observers are tilted to the side relative to gravity; the orientation of the light-from-above prior will change in a direction between the orientation of the body; gravity and the visual surround. The contribution of ocular torsion in this change of the light-from-above prior has been acknowledged but not specifically addressed. Here we test the hypothesis that when lighting direction is the only available visual orientation cue; change in orientation of the light-from-above prior is accounted for by ocular torsion. Observers made convex-concave judgments of a central shaded disk; flanked by three similarly- and three oppositely-shaded disks. Lighting was tested every 15° in roll in the fronto-parallel plane. Observers were tested when upright; supine; and tilted every 30 ° in role relative to gravity. Our results show that change of the light-from-above prior is well predicted from a sum of two sines; one consistent with predicted ocular torsion; the other consistent with an additional component varying with twice the frequency of body tilt.
Erscheinungsjahr
2010
Titel des Konferenzbandes
11th International Multisensory Research Forum (IMRF 2010)
Konferenz
11th International Multisensory Research Forum (IMRF 2010)
Page URI
https://pub.uni-bielefeld.de/record/2355652

## Zitieren

Barnett-Cowan M, Ernst MO, Bülthoff HH. Change of the ''light-from-above'' prior when the body is tilted relative to gravity. In: 11th International Multisensory Research Forum (IMRF 2010). 2010.
Barnett-Cowan, M., Ernst, M. O., & Bülthoff, H. H. (2010). Change of the ''light-from-above'' prior when the body is tilted relative to gravity. 11th International Multisensory Research Forum (IMRF 2010)
Barnett-Cowan, M, Ernst, Marc O., and Bülthoff, H H. 2010. “Change of the ''light-from-above'' prior when the body is tilted relative to gravity”. In 11th International Multisensory Research Forum (IMRF 2010).
Barnett-Cowan, M., Ernst, M. O., and Bülthoff, H. H. (2010). “Change of the ''light-from-above'' prior when the body is tilted relative to gravity” in 11th International Multisensory Research Forum (IMRF 2010).
Barnett-Cowan, M., Ernst, M.O., & Bülthoff, H.H., 2010. Change of the ''light-from-above'' prior when the body is tilted relative to gravity. In 11th International Multisensory Research Forum (IMRF 2010).
M. Barnett-Cowan, M.O. Ernst, and H.H. Bülthoff, “Change of the ''light-from-above'' prior when the body is tilted relative to gravity”, 11th International Multisensory Research Forum (IMRF 2010), 2010.
Barnett-Cowan, M., Ernst, M.O., Bülthoff, H.H.: Change of the ''light-from-above'' prior when the body is tilted relative to gravity. 11th International Multisensory Research Forum (IMRF 2010). (2010).
Barnett-Cowan, M, Ernst, Marc O., and Bülthoff, H H. “Change of the ''light-from-above'' prior when the body is tilted relative to gravity”. 11th International Multisensory Research Forum (IMRF 2010). 2010.
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