Definition and factors of visual attention and searching

Thus, many of the discoveries in the field of attention were made by philosophers. Watson calls Juan Luis Vives the father of modern psychology because, in his book De Anima et Vita The Soul and Lifehe was the first to recognize the importance of empirical investigation.

Definition and factors of visual attention and searching

What is visual attention? Visual system Attention Eye movement The aim of this page is to briefly describe what is visual attention and how does it operate.

During the day, we scan this visual spotlight all around the environment targeting things like faces, words, images on a package, and a variety of other objects.

This process can occur both non-consciously and by conscious direction. What is it that determines what we shine our spotlight upon?

Definition and factors of visual attention and searching

At its most basic, attention is defined as the process by which we select a subset from all of the available information for further processing. While attention is a rich and diverse field of study in and of itself, a straightforward framework for thinking about attention in the context of visual processes for eye tracking can have great practical value.

It is useful to think of attentional selection as an interaction, both competitive and cooperative, between bottom-up and top-down factors.

Visual search - Wikipedia

When we think of the brain in the context of vision, we are generally considering the primary visual cortex and the downstream visual areas along the pathways for the neural processing of vision.

In between the eyes and the visual cortex, there are also a number of important structures including the optic nerves, the thalamus, and lateral geniculate nucleus. Discussion of these and other areas, such as the frontal eye fields for coordination of eye movements, are beyond the scope of this workbook.

It is generally true, though, that the eyes carry out more basic functions while the areas of the brain along the visual pathways conduct integrative information processing. This is the pathway where the extraction of spatial relationships between things in the visual field and the planning of bodily movement takes place.

19th-century roots

Bottom-up vs Top-down influences on attention Bottom-up influences have nothing to do with direction or spatial location, per se. Rather, these are factors that are low level, early, and normative. Normative means that unless a subject has a specific condition or impairment such as color blindness, these capabilities can be expected to be inherent to people in general.

Low level and early pertain to processes that occur almost as soon as the photons of light from the visual scene hit the retina.

Recall that we likened the retina to the CCD of a digital camera. That this happens before the visual signal even gets to the visual centers of the brain means these preprocessed features are immune to conscious effects.

Visual illusions often reveal the functioning of these processes. The horizontal lines of the top part of the image are parallel just like the lines below.

A fact that one could verify by measurement. However, the presence of the short, slanted lines activates low level visual process that contribute to the overall illusion of non-parallelism.

In contrast to the fast, automatic bottom-up processes, there is another set of considerations that is often at play during eye tracking tasks: These influencers of attention are generally high level, cognitive in nature, and individuating. They often involve some consideration, thought, or context-setting for effect.

Given these two types of attention-influencing factors, how does the eye tracking researcher apply them in practice? It is useful to think of bottom-up factors as the workspace of the designer. This could be a web or packaging designer, a graphic artist, or a developmental psychology researcher.

Definition and factors of visual attention and searching

If you make visual design decisions about test stimuli, and you do so taking into account design principles, you are effectively manipulating bottom-up features of a stimulus to achieve desired ends.

Such goals could be to get viewers to notice faster, remember something better, read more, click through more often, react, or decide.

Visual search - Scholarpedia

The top-down factors are important concerns of the experimentalist. In addition to task design and formulating instructions, the researcher decides on the gender split, experience level, or ethnicities recruited to test the design manipulations.

In other words, do the stimuli including its bottom-up design features elicit the expected effect among the population of interest? Often, the response is not the goal itself but rather provides clues to the cognitive processes that are the true target of interest.

So whether stimulus design and experimentation is carried out by one or several resources, a successful eye tracking study ensures that the experiment aligns the considerations from design to the test, and ultimately through to analysis of the data.

About overt and covert attention While the narrow, high resolution field of foveal central vision is most commonly the primary target of study in eye tracking research, visual attention can be spread out over a much wider area.

Accordingly, we can think of attention in terms of covert and overt components.Overview Visual attention Karla K. Evans,1 Todd S. Horowitz,1 Piers Howe,1 Roccardo Pedersini,1 Ester Reijnen,2 Yair Pinto,1 Yoana Kuzmova1 and Jeremy M. Wolfe1∗ A typical visual scene we encounter in everyday life is complex and filled with a huge amount of perceptual information.

the procedure of identifying a target visual stimulant among distractor traits of the target and distractors are altered in experimental analyses to investigate the cognitive functions which cause visual attention. Human visual search involves oculomotor control through fixational eye movements, covert visual attention, understanding of differences in visual processing across retinal locations, temporal integration of information across eye movements as search progresses, memory for scene configurations, and decision strategies.

Chapter 6: Visual Attention "Everyone knows what attention is. It is the taking possession by the mind in clear and vivid form, of one out of what seem several simultaneously possible. Perception: Meaning, Definition, Principles and Factors Affecting in Perception!

Everyday different stimuli around us will be stimulating our sense organs. Many of these stimuli are received by our sense organs and are converted into sensations. These sensations are transmitted to the concerned parts of brain.

ADVERTISEMENTS: In turn the brain will . Cognitive influences on attention In , William James famously defined attention as taking possession by the mind of one out The present article focuses on how cognitive factors—goals and expectations of an observer—influence visual attention.

Whether a given stimulus is attended depends both on its inherent salience and the state of.

What is VISUAL SEARCH? definition of VISUAL SEARCH (Psychology Dictionary)