scholarly journals The time course of feature-based and object-based control of visual attention

2015 ◽  
Vol 15 (12) ◽  
pp. 1394
Author(s):  
Martin Eimer
Keyword(s):  
Visual Attention ◽  
Time Course ◽  
Object Based ◽  
Feature Based

scholarly journals Left-Hemispheric Asymmetry for Object-Based Attention: an ERP Study

2019 ◽  
Vol 9 (11) ◽  
pp. 315 ◽  
Author(s):  
Andrea Orlandi ◽  
Alice Mado Proverbio
Keyword(s):  
Visual Attention ◽  
Hemispheric Asymmetry ◽  
Time Course ◽  
Electrophysiological Study ◽  
Target Selection ◽  
Neural Correlates ◽  
Specific Stimulus ◽  
Object Categories ◽  
Object Based ◽  
Stimulus Features

It has been shown that selective attention enhances the activity in visual regions associated with stimulus processing. The left hemisphere seems to have a prominent role when non-spatial attention is directed towards specific stimulus features (e.g., color, spatial frequency). The present electrophysiological study investigated the time course and neural correlates of object-based attention, under the assumption of left-hemispheric asymmetry. Twenty-nine right-handed participants were presented with 3D graphic images representing the shapes of different object categories (wooden dummies, chairs, structures of cubes) which lacked detail. They were instructed to press a button in response to a target stimulus indicated at the beginning of each run. The perception of non-target stimuli elicited a larger anterior N2 component, which was likely associated with motor inhibition. Conversely, target selection resulted in an enhanced selection negativity (SN) response lateralized over the left occipito-temporal regions, followed by a larger centro-parietal P300 response. These potentials were interpreted as indexing attentional selection and categorization processes, respectively. The standardized weighted low-resolution electromagnetic tomography (swLORETA) source reconstruction showed the engagement of a fronto-temporo-limbic network underlying object-based visual attention. Overall, the SN scalp distribution and relative neural generators hinted at a left-hemispheric advantage for non-spatial object-based visual attention.

Object- and Feature-Based Attention

2014 ◽  
Author(s):  
Stefan Treue
Keyword(s):  
Visual Attention ◽  
Rhesus Monkeys ◽  
Visual Space ◽  
Saliency Map ◽  
Neural Representation ◽  
Selective Visual Attention ◽  
Priority Map ◽  
Object Based ◽  
Feature Based ◽  
Motion Studies

The allocation of selective visual attention to a particular region of visual space has been attention’s most-studied variant. But attention can also be allocated to features, such as a particular colour or direction of motion. Studies from the visual cortex of rhesus monkeys have revealed a gain modulation across visual space that enhances the response of neurons that show a preference for the attended feature and a reduced responsiveness of those neurons tuned to the opposite feature. Such studies have also provided evidence for object-based attention, where the attentional enhancement of a neural representation affects the complex amalgamation of features that make up an object. All these forms of visual attention together create an integrated saliency map or priority map, that is, an integrated representation of relative stimulus strength and behavioural relevance across visual space that underlies our perception of the environment.

scholarly journals The time course of neural activity in object-based visual attention

2010 ◽  
Vol 8 (6) ◽  
pp. 549-549
Author(s):  
L. Moya ◽  
S. Shomstein ◽  
A. Bagic ◽  
M. Behrmann
Keyword(s):  
Visual Attention ◽  
Neural Activity ◽  
Time Course ◽  
Object Based

scholarly journals Object-based auditory and visual attention

2008 ◽  
Vol 12 (5) ◽  
pp. 182-186 ◽  
Author(s):  
Barbara G. Shinn-Cunningham
Keyword(s):  
Visual Attention ◽  
Object Based

Object-based and environment-based inhibition of return of visual attention.

1994 ◽  
Vol 20 (3) ◽  
pp. 478-499 ◽  
Author(s):  
Steven P. Tipper ◽  
Bruce Weaver ◽  
Loretta M. Jerreat ◽  
Arloene L. Burak
Keyword(s):  
Visual Attention ◽  
Inhibition Of Return ◽  
Object Based

Neural Mechanisms of Visual Attention: Object-Based Selection of a Region in Space

2000 ◽  
Vol 12 (supplement 2) ◽  
pp. 106-117 ◽  
Author(s):  
Catherine M. Arrington ◽  
Thomas H. Carr ◽  
Andrew R. Mayer ◽  
Stephen M. Rao
Keyword(s):  
Visual Attention ◽  
Spatial Attention ◽  
Brain Activity ◽  
Temporal Cortex ◽  
Brain Structures ◽  
Brain Regions ◽  
Brain Areas ◽  
Unbounded Region ◽  
Object Based ◽  
Selection Of

Objects play an important role in guiding spatial attention through a cluttered visual environment. We used event-related functional magnetic resonance imaging (ER-fMRI) to measure brain activity during cued discrimination tasks requiring subjects to orient attention either to a region bounded by an object (object-based spatial attention) or to an unbounded region of space (location-based spatial attention) in anticipation of an upcoming target. Comparison between the two tasks revealed greater activation when attention selected a region bounded by an object. This activation was strongly lateralized to the left hemisphere and formed a widely distributed network including (a) attentional structures in parietal and temporal cortex and thalamus, (b) ventral-stream object processing structures in occipital, inferior-temporal, and parahippocampal cortex, and (c) control structures in medial-and dorsolateral-prefrontal cortex. These results suggest that object-based spatial selection is achieved by imposing additional constraints over and above those processes already operating to achieve selection of an unbounded region. In addition, ER-fMRI methodology allowed a comparison of validly versus invalidly cued trials, thereby delineating brain structures involved in the reorientation of attention after its initial deployment proved incorrect. All areas of activation that differentiated between these two trial types resulted from greater activity during the invalid trials. This outcome suggests that all brain areas involved in attentional orienting and task performance in response to valid cues are also involved on invalid trials. During invalid trials, additional brain regions are recruited when a perceiver recovers from invalid cueing and reorients attention to a target appearing at an uncued location. Activated brain areas specific to attentional reorientation were strongly right-lateralized and included posterior temporal and inferior parietal regions previously implicated in visual attention processes, as well as prefrontal regions that likely subserve control processes, particularly related to inhibition of inappropriate responding.

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