scholarly journals Dimensional weighting in cross-dimensional singleton conjunction search

2013 ◽  
Vol 13 (3) ◽  
pp. 25-25 ◽  
Author(s):  
R. Weidner ◽  
H. J. Muller
Keyword(s):  
Conjunction Search ◽  
Dimensional Weighting

scholarly journals Causal Evidence for the Role of Neuronal Oscillations in Top–Down and Bottom–Up Attention

2019 ◽  
Vol 31 (5) ◽  
pp. 768-779 ◽  
Author(s):  
Justin Riddle ◽  
Kai Hwang ◽  
Dillan Cellier ◽  
Sofia Dhanani ◽  
Mark D'Esposito
Keyword(s):  
Visual Field ◽  
Conjunction Search ◽  
Intraparietal Sulcus ◽  
Top Down ◽  
Neuronal Oscillations ◽  
Bottom Up ◽  
Search Condition ◽  
Gamma Frequency ◽  
Task Conditions ◽  
Beta Frequency

Beta and gamma frequency neuronal oscillations have been implicated in top–down and bottom–up attention. In this study, we used rhythmic TMS to modulate ongoing beta and gamma frequency neuronal oscillations in frontal and parietal cortex while human participants performed a visual search task that manipulates bottom–up and top–down attention (single feature and conjunction search). Both task conditions will engage bottom–up attention processes, although the conjunction search condition will require more top–down attention. Gamma frequency TMS to superior precentral sulcus (sPCS) slowed saccadic RTs during both task conditions and induced a response bias to the contralateral visual field. In contrary, beta frequency TMS to sPCS and intraparietal sulcus decreased search accuracy only during the conjunction search condition that engaged more top–down attention. Furthermore, beta frequency TMS increased trial errors specifically when the target was in the ipsilateral visual field for the conjunction search condition. These results indicate that beta frequency TMS to sPCS and intraparietal sulcus disrupted top–down attention, whereas gamma frequency TMS to sPCS disrupted bottom–up, stimulus-driven attention processes. These findings provide causal evidence suggesting that beta and gamma oscillations have distinct functional roles for cognition.

scholarly journals Probabilistic modeling of eye movement data during conjunction search via feature-based attention

10.1167/7.6.5 ◽  
2007 ◽  
Vol 7 (6) ◽  
pp. 5 ◽  
Author(s):  
Ueli Rutishauser ◽  
Christof Koch
Keyword(s):  
Eye Movement ◽  
Probabilistic Modeling ◽  
Conjunction Search ◽  
Movement Data ◽  
Feature Based

scholarly journals Categorical grouping is not required for guided conjunction search

2020 ◽  
Vol 20 (8) ◽  
pp. 30
Author(s):  
Igor S. Utochkin ◽  
Vladislav A. Khvostov ◽  
Jeremy M. Wolfe
Keyword(s):  
Conjunction Search

scholarly journals Reading problems and their connection with visual search and attention: The search for a cause continues

2021 ◽  
Author(s):  
Heida Maria Sigurdardottir ◽  
Hilma Ros Omarsdóttir ◽  
Anna Sigridur Valgeirsdottir
Keyword(s):  
Visual Search ◽  
Internal Control ◽  
Search Task ◽  
Conjunction Search ◽  
Reading Problems ◽  
Visual Stream ◽  
Attentional Processes ◽  
Search Tasks ◽  
Reading Abilities ◽  
Gating Mechanism

Attention has been hypothesized to act as a sequential gating mechanism for the orderly processing of letters in words. These same visuo-attentional processes are assumed to partake in some but not all visual search tasks. In the current study, 60 adults with varying degrees of reading abilities, ranging from expert readers to severely impaired dyslexic readers, completed an attentionally demanding visual conjunction search task thought to heavily rely on the dorsal visual stream. A visual feature search task served as an internal control. According to the dorsal view of dyslexia, reading problems should go hand in hand with specific problems in visual conjunction search – particularly elevated conjunction search slopes (time per search item) – which would be interpreted as a problem with visual attention. Results showed that reading problems were associated with slower visual search, especially conjunction search. However, problems with reading were not associated with increased conjunction search slopes but instead with increased conjunction search intercepts, traditionally not interpreted as reflecting attentional processes. Our data are hard to reconcile with hypothesized problems in dyslexia with the serial moving of an attentional spotlight across a visual scene or a page of text.

scholarly journals Spatial resolution underlies the set size effect in conjunction search

2010 ◽  
Vol 2 (7) ◽  
pp. 538-538
Author(s):  
K. S. Frieder ◽  
M. Carrasco
Keyword(s):  
Size Effect ◽  
Spatial Resolution ◽  
Conjunction Search ◽  
Set Size

Towards Secure and Efficient Equality Conjunction Search over Outsourced Databases

2020 ◽  
pp. 1-1
Author(s):  
Weipeng Lin ◽  
Ke Wang ◽  
Zhilin Zhang ◽  
Ada Wai-Chee Fu ◽  
Raymond Chi-Wing Wong ◽  
...  
Keyword(s):  
Conjunction Search ◽  
Outsourced Databases

Three-dimensional weighting reconstruction algorithm for circular cone-beam CT under large scan angles

2017 ◽  
Vol 28 (8) ◽  
Author(s):  
Ya-Fei Yang ◽  
Ding-Hua Zhang ◽  
Kui-Dong Huang ◽  
Fu-Qiang Yang ◽  
Zong-Zhao Gao
Keyword(s):  
Cone Beam Ct ◽  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Circular Cone ◽  
Cone Beam ◽  
Dimensional Weighting

scholarly journals Feature head-start: Conjunction search following progressive feature disclosure

2009 ◽  
Vol 49 (11) ◽  
pp. 1428-1447 ◽  
Author(s):  
Elizabeth S. Olds ◽  
Timothy J. Graham ◽  
Jeffery A. Jones
Keyword(s):  
Head Start ◽  
Conjunction Search

Distractor Ratio and Grouping Processes in Visual Conjunction Search

Perception ◽  
1992 ◽  
Vol 21 (1) ◽  
pp. 21-38 ◽  
Author(s):  
Marie E Poisson ◽  
Frances Wilkinson
Keyword(s):  
Search Strategy ◽  
Conjunction Search ◽  
Integration Theory ◽  
Distractor Type ◽  
Fixed Size ◽  
Single Feature ◽  
Search Processes ◽  
Cast Doubt ◽  
Feature Integration Theory

According to feature integration theory, conjunction search is conducted via a serial self-terminating search. However, effects attributed to search processes operating on the entire display may actually reflect search restricted to elements defined by a single feature. In experiment 1 this question is addressed in a reaction-time (RT) paradigm by varying distractor ratios within an array of fixed size. For trials in which the target was present in the array, RT functions were roughly symmetric, the shortest RTs being for extreme distractor ratios, and the longest RTs being for arrays in which there were an equal number of each distractor type. This result is superficially consistent with Zohary and Hochstein's interpretation that subjects search for only one distractor type and are able to switch search strategy from trial to trial. However, negative-trial data from experiment 1 cast doubt on this interpretation. In experiment 2 the possible role of ‘pop out’ and of distractor grouping in visual conjunction search is investigated. Results of experiment 2 suggest that grouping may play a more important role than does distractor ratio, and point to the importance of the spatial layout of the target and of the distractor elements in visual conjunction search. Results of experiment 2 also provide clear evidence that groups of spatially adjacent homogeneous elements may be processed as a unit.

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