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Fixation and saliency during search of natural scenes: the case of visual agnosia

Foulsham, Tom; Barton, Jason; Kingstone, Alan; Dewhurst, Richard LU and Underwood, Geoffrey (2009) In Neuropsychologia 47(8-9). p.1994-2003
Abstract
Models of eye movement control in natural scenes often distinguish between stimulus-driven processes (which guide the eyes to visually salient regions) and those based on task and object knowledge (which depend on expectations or identification of objects and scene gist). In the present investigation, the eye movements of a patient with visual agnosia were recorded while she searched for objects within photographs of natural scenes and compared to those made by students and age-matched controls. Agnosia is assumed to disrupt the top-down knowledge available in this task, and so may increase the reliance on bottom-up cues. The patient's deficit in object recognition was seen in poor search performance and inefficient scanning. The low-level... (More)
Models of eye movement control in natural scenes often distinguish between stimulus-driven processes (which guide the eyes to visually salient regions) and those based on task and object knowledge (which depend on expectations or identification of objects and scene gist). In the present investigation, the eye movements of a patient with visual agnosia were recorded while she searched for objects within photographs of natural scenes and compared to those made by students and age-matched controls. Agnosia is assumed to disrupt the top-down knowledge available in this task, and so may increase the reliance on bottom-up cues. The patient's deficit in object recognition was seen in poor search performance and inefficient scanning. The low-level saliency of target objects had an effect on responses in visual agnosia, and the most salient region in the scene was more likely to be fixated by the patient than by controls. An analysis of model-predicted saliency at fixation locations indicated a closer match between fixations and low-level saliency in agnosia than in controls. These findings are discussed in relation to saliency-map models and the balance between high and low-level factors in eye guidance. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Eye movements, Agnosia, Scene perception
in
Neuropsychologia
volume
47
issue
8-9
pages
1994 - 2003
publisher
Elsevier
external identifiers
  • scopus:67349103900
ISSN
1873-3514
DOI
10.1016/j.neuropsychologia.2009.03.013
language
English
LU publication?
no
id
7f2b1019-5b16-4f14-918a-7b64f755b129 (old id 1614469)
date added to LUP
2010-06-18 12:58:23
date last changed
2017-08-06 03:31:47
@article{7f2b1019-5b16-4f14-918a-7b64f755b129,
  abstract     = {Models of eye movement control in natural scenes often distinguish between stimulus-driven processes (which guide the eyes to visually salient regions) and those based on task and object knowledge (which depend on expectations or identification of objects and scene gist). In the present investigation, the eye movements of a patient with visual agnosia were recorded while she searched for objects within photographs of natural scenes and compared to those made by students and age-matched controls. Agnosia is assumed to disrupt the top-down knowledge available in this task, and so may increase the reliance on bottom-up cues. The patient's deficit in object recognition was seen in poor search performance and inefficient scanning. The low-level saliency of target objects had an effect on responses in visual agnosia, and the most salient region in the scene was more likely to be fixated by the patient than by controls. An analysis of model-predicted saliency at fixation locations indicated a closer match between fixations and low-level saliency in agnosia than in controls. These findings are discussed in relation to saliency-map models and the balance between high and low-level factors in eye guidance.},
  author       = {Foulsham, Tom and Barton, Jason and Kingstone, Alan and Dewhurst, Richard and Underwood, Geoffrey},
  issn         = {1873-3514},
  keyword      = {Eye movements,Agnosia,Scene perception},
  language     = {eng},
  number       = {8-9},
  pages        = {1994--2003},
  publisher    = {Elsevier},
  series       = {Neuropsychologia},
  title        = {Fixation and saliency during search of natural scenes: the case of visual agnosia},
  url          = {http://dx.doi.org/10.1016/j.neuropsychologia.2009.03.013},
  volume       = {47},
  year         = {2009},
}