osnaDocs: Overt visual attention under natural conditions

Overt visual attention under natural conditions

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https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2009073116

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DC Field	Value	Language
dc.contributor.advisor	Prof. Dr. Peter König
dc.creator	Frey, Hans-Peter
dc.date.accessioned	2010-01-30T14:56:58Z
dc.date.available	2010-01-30T14:56:58Z
dc.date.issued	2009-07-30T17:37:09Z
dc.date.submitted	2009-07-30T17:37:09Z
dc.identifier.uri	https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2009073116	-
dc.description.abstract	In a natural environment, humans are not able to process all information available to the visual system simultaneously. As a consequence, we attend to different subparts of the input one after the other. Under natural viewing conditions, these shifts of attention are associated with changes in fixation. This so-called overt attention therefore provides an objective measure of attention shifts. In my thesis, I investigate the influence of color on overt visual attention. I present human subjects with different categories of color-calibrated images and record their eye-movements. In the first series of experiments, images of 7 different categories (Face, Flower, Forest, Fractal, Landscape, Man-Made object, and Rainforest) are presented either in natural color or grayscale. With regard to the influence of color on overt attention, I find two extreme categories: while in Rainforest images all color features examined are salient, none is salient in Fractal. In all other categories, color features are selectively salient. This shows that the influence of color on overt attention depends on the type of image. In the second series of experiments, I use only Rainforest images. These are presented to color-normal or deuteranope subjects with several modifications in the color domain. I find a causal influence of color-contrast on overt attention, processed in a way that it is not specific to either the red-green or blue-yellow color channel. In the case of color blindness, a slower high-level compensatory mechanism affects the selection of fixation points. These experiments show that there is no single color feature, which influences overt attention in all possible environments. I provide evidence that different levels of the visual hierarchy are involved in the computation of saliency.	eng
dc.language.iso	eng
dc.subject	Attention
dc.subject	Eye-movements
dc.subject	Color
dc.subject	Natural Scenes
dc.subject.ddc	610 - Medizin, Gesundheit	ger
dc.title	Overt visual attention under natural conditions	eng
dc.type	Dissertation oder Habilitation [doctoralThesis]	-
thesis.location	Osnabrück	-
thesis.institution	Universität	-
thesis.type	Dissertation [thesis.doctoral]	-
thesis.date	2009-03-23T12:00:00Z	-
elib.elibid	916	-
elib.marc.edt	jost	-
elib.dct.accessRights	a	-
elib.dct.created	2009-07-06T01:41:09Z	-
elib.dct.modified	2009-07-30T17:37:09Z	-
dc.contributor.referee	PD Dr. Ulrich Ansorge
dc.contributor.referee	Prof. Dr. Markus Lappe
dc.subject.dnb	11 - Psychologie	ger
vCard.ORG	FB8	ger
Appears in Collections:	FB08 - E-Dissertationen

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