Object-based target templates guide attention during visual search.

08:00 EDT 3rd May 2018 | BioPortfolio

Summary of "Object-based target templates guide attention during visual search."

During visual search, attention is believed to be controlled in a strictly feature-based fashion, without any guidance by object-based target representations. To challenge this received view, we measured electrophysiological markers of attentional selection (N2pc component) and working memory (sustained posterior contralateral negativity; SPCN) in search tasks where two possible targets were defined by feature conjunctions (e.g., blue circles and green squares). Critically, some search displays also contained nontargets with two target features (incorrect conjunction objects, e.g., blue squares). Because feature-based guidance cannot distinguish these objects from targets, any selective bias for targets will reflect object-based attentional control. In Experiment 1, where search displays always contained only one object with target-matching features, targets and incorrect conjunction objects elicited identical N2pc and SPCN components, demonstrating that attentional guidance was entirely feature-based. In Experiment 2, where targets and incorrect conjunction objects could appear in the same display, clear evidence for object-based attentional control was found. The target N2pc became larger than the N2pc to incorrect conjunction objects from 250 ms poststimulus, and only targets elicited SPCN components. This demonstrates that after an initial feature-based guidance phase, object-based templates are activated when they are required to distinguish target and nontarget objects. These templates modulate visual processing and control access to working memory, and their activation may coincide with the start of feature integration processes. Results also suggest that while multiple feature templates can be activated concurrently, only a single object-based target template can guide attention at any given time. (PsycINFO Database Record


Journal Details

This article was published in the following journal.

Name: Journal of experimental psychology. Human perception and performance
ISSN: 1939-1277


DeepDyve research library

PubMed Articles [24981 Associated PubMed Articles listed on BioPortfolio]

Visual mental imagery influences attentional guidance in a visual-search task.

Visual mental imagery resembles visual working memory (VWM). Because both visual mental imagery and VWM involve the representation and manipulation of visual information, it was hypothesized that they...

The development of object-based attention in infants.

We examined whether infants aged 6-8 months show object-based attention using the preferential looking method. In object-based attention, which is a prerequisite function for efficient real-world proc...

Category-based attentional guidance can operate in parallel for multiple target objects.

The question whether the control of attention during visual search is always feature-based or can also be based on the category of objects remains unresolved. Here, we employed the N2pc component as a...

Object-Based Attention on Social Units: Visual Selection of Hands Performing a Social Interaction.

Traditionally, objects of attention are characterized either as full-fledged entities or either as elements grouped by Gestalt principles. Because humans appear to use social groups as units to explai...

Object width modulates object-based attentional selection.

Visual input typically includes a myriad of objects, some of which are selected for further processing. While these objects vary in shape and size, most evidence supporting object-based guidance of at...

Clinical Trials [8341 Associated Clinical Trials listed on BioPortfolio]

Hydrocephalus iPad-App Based Intervention Study

This is a pilot study examining the feasibility and efficacy of using Apple iPad applications ("apps") during therapy interventions that target visual motor, visual attention, and visual-s...

Memory and Attention in Healthy Children

This project studies memory and attention in healthy children aged from 5 to 17 years. The processes investigated are short term memory (auditory and visual) and attention. To characteriz...

Study of Visual-spatial Attention by Eye Tracking as a Function of Central or Peripheral Visual Impairment

The objective of this pilot work is to determine the role of central and peripheral visions in explicit attention processes (saccade planning) in the case of visual impairment.

Visual Attention and Eye Movements

The purpose of this study is to provide information about how the brain processes sensory inputs using visual stimuli throughout various psychophysical experiments.

Brain-Computer Interface (BCI)-Based Feedback for Chronic Pain Management

The feasibility study proposed here will primarily examine the sensitivity of an electroencephalogram (EEG)-based Brain Computer Interface (BCI) in detecting significant differences in bra...

Medical and Biotech [MESH] Definitions

The act of "taking account" of an object or state of affairs. It does not imply assessment of nor attention to the qualities or nature of the object.

Temporary visual deficit or impaired visual processing occurring in a rapid serial visual presentation task. After a person identifies the first of two visual targets, the ability to detect the second target is impaired for the next few hundred milliseconds. This phenomenon is called attentional blink.

The selecting and organizing of visual stimuli based on the individual's past experience.

A visual symptom in which a single object is perceived by the visual cortex as two objects rather than one. Disorders associated with this condition include REFRACTIVE ERRORS; STRABISMUS; OCULOMOTOR NERVE DISEASES; TROCHLEAR NERVE DISEASES; ABDUCENS NERVE DISEASES; and diseases of the BRAIN STEM and OCCIPITAL LOBE.

Mental activity, not predominantly perceptual, by which one apprehends some aspect of an object or situation based on past learning and experience.

Quick Search


DeepDyve research library

Searches Linking to this Article