The role of visual salience in directing eye movements in visual object agnosia

نویسندگان

  • Sabira K. Mannan
  • Christopher Kennard
  • Masud Husain
چکیده

Sabira K. Mannan1, Christopher Kennard1,3 and Masud Husain2,3 Correspondence When we look at a scene our scanning eye movements are not random [1]. Remarkably, different observers look at similar points in a given image. One explanation is that our understanding of the scene controls the paths our eyes take — so called ‘top-down’ control. An alternative possibility is that the visual system uses low-level ‘bottom-up’ features, such as edges, contrast or boundaries, to determine where the eyes land [2–4]. Fixated locations have been shown to contain higher values of ‘low-level’ visual features than non-fixated

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

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

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 mode...

متن کامل

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

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 object...

متن کامل

Evaluation of Visual Signs and Symptoms in Patients with Alzheimer's Disease

Background and Objective:Patients with Alzheimer's disease have impaired visual function even in the early stages of the disease. Therefore, the present study aimed to determine the visual signs and symptoms in patients with Alzheimer's disease and compare them with those in the control group. Materials and Methods:This cross-sectional descriptive study was conducted on 19 Alzheimer patients a...

متن کامل

Low-level visual saliency does not predict change detection in natural scenes.

Saliency models of eye guidance during scene perception suggest that attention is drawn to visually conspicuous areas having high visual salience. Despite such low-level visual processes controlling the allocation of attention, higher level information gained from scene knowledge may also control eye movements. This is supported by the findings of eye-tracking studies demonstrating that scene-i...

متن کامل

The Role of Attentional Priority and Saliency in Determining Capacity Limits in Enumeration and Visual Working Memory

Many common tasks require us to individuate in parallel two or more objects out of a complex scene. Although the mechanisms underlying our abilities to count the number of items, remember the visual properties of objects and to make saccadic eye movements towards targets have been studied separately, each of these tasks require selection of individual objects and shows a capacity limit. Here we...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Current Biology

دوره 19  شماره 

صفحات  -

تاریخ انتشار 2009