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Modeling eye movements in visual agnosia with a saliency map approach: Bottom–up guidance or top–down strategy?

Författare

  • Tom Foulsham
  • Jason Barton
  • Alan Kingstone
  • Richard Dewhurst
  • Geoffrey Underwood

Summary, in English

Two recent papers (Foulsham, Barton, Kingstone, Dewhurst, & Underwood, 2009; Mannan, Kennard, & Husain, 2009) report that neuropsychological patients with a profound object recognition problem (visual

agnosic subjects) show differences from healthy observers in the way their eye movements are controlled when looking at images. The interpretation of these papers is that eye movements can be modeled as the selection of points on a saliency map, and that agnosic subjects show an increased reliance on visual saliency, i.e., brightness and contrast in low-level stimulus features. Here we review this approach and present new data from our own experiments with an agnosic patient that quantifies the relationship

between saliency and fixation location. In addition, we consider whether the perceptual difficulties of individual patients might be modeled by selectively weighting the different features involved in a saliency

map. Our data indicate that saliency is not always a good predictor of fixation in agnosia: even for our agnosic subject, as for normal observers, the saliency–fixation relationship varied as a function of the

task. This means that top–down processes still have a significant effect on the earliest stages of scanning in the setting of visual agnosia, indicating severe limitations for the saliency map model. Top–down, active

strategies – which are the hallmark of our human visual system – play a vital role in eye movement control, whether we know what we are looking at or not.

Publiceringsår

2011

Språk

Engelska

Sidor

665-677

Publikation/Tidskrift/Serie

Neural Networks

Volym

24

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Human Aspects of ICT

Nyckelord

  • Object recognition
  • Visual attention
  • Neuropsychology
  • Visual saliency
  • Eye movements

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1879-2782