7 Feb
2013
7 Feb
'13
1:32 p.m.
The CEU Department of Cognitive Science cordially invites you to a talk
(as part of its Departmental Colloquium series)
by
Prof. Pascal Mamassian,
CNRS & Université Paris Descartes, France
Date: Wednesday, February 13, 2013 - 17:00 - 18:30
Location: Department of Cognitive Science, CEU, Frankel Leó út 30-34.,
Room G15
Uncertainty and confidence in visual perception
Visual perception is often seen as an inference problem where
uncertainty comes from ambiguities in the world (e.g. the two 3D
interpretations of the Necker cube), noise in the world (e.g.
identifying a scene behind falling snowflakes), or noise in the visual
system (e.g. synaptic noise). To deal with ambiguities, the visual
system relies on prior knowledge such as the assumption that light comes
from above our head. We have measured the characteristics of this
assumption and found a systematic bias to the above-left for the
illumination direction preference. In addition, we found evidence that
the above-left assumption for the light source position is encoded early
in the visual system and processed in a bottom-up way. Perceived
uncertainty also determines the confidence in our perceptual decisions.
With experiments on orientation discrimination, we show that objective
confidence judgments are correlated with discrimination performance, and
that these confidence judgements are not just based on some visibility
cues in the stimulus. Overall, these results open the door for a
thorough investigation of the processing of uncertainty and confidence
by the visual system.
We're looking forward to see you there (Frankel Leo u. 30-34) !
Cognitive Science Events at CEU: http://cognitivescience.ceu.hu/events
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