scholarly journals Neural correlates of context-dependent feature conjunction learning in visual search tasks

2016 ◽  
Vol 37 (6) ◽  
pp. 2319-2330 ◽  
Author(s):  
Eric A. Reavis ◽  
Sebastian M. Frank ◽  
Mark W. Greenlee ◽  
Peter U. Tse
1993 ◽  
Vol 5 (2) ◽  
pp. 188-195 ◽  
Author(s):  
Steven J. Luck ◽  
Silu Fan ◽  
Steven A. Hillyard

When subjects are explicitly cued to focus attention on a particular location in visual space, targets presented at that location have been shown to elicit enhanced sensory-evoked activity in recordings of event-related brain potentials (ERPs). The present study sought to determine if this type of sensory facilitation also occurs during visual search tasks in which a feature conjunction target must be identified, presumably by means of focal attention, within an array of distractor items. In this experiment, subjects were required to discriminate the shape of a distinctively colored target item within an array containing 15 distractor items, and ERPs were elicited by task-irrelevant probe stimuli that were presented at the location of the target item or at the location of a distractor item on the opposite side of the array. When the delay between search-array onset and probe onset was 250 msec, the sensory-evoked responses in the latency range 75-200 msec were larger for probes presented at the location of the target than for probes presented at the location of the irrelevant distractor. These results indicate that sensory processing is modulated in a spatially restricted manner during visual search, and that focusing attention on a feature conjunction target engages neural systems that are shared with other forms of visual-spatial attention.


2012 ◽  
Author(s):  
Stephen R. Mitroff ◽  
Adam T. Biggs ◽  
Matthew S. Cain ◽  
Elise F. Darling ◽  
Kait Clark ◽  
...  

1998 ◽  
Vol 6 (3) ◽  
pp. 227-232 ◽  
Author(s):  
Philippe Stivalet ◽  
Yvan Moreno ◽  
Joëlle Richard ◽  
Pierre-Alain Barraud ◽  
Christian Raphel
Keyword(s):  

Perception ◽  
1992 ◽  
Vol 21 (4) ◽  
pp. 465-480 ◽  
Author(s):  
Jeremy M Wolfe ◽  
Alice Yee ◽  
Stacia R Friedman-Hill

2021 ◽  
Author(s):  
Heida Maria Sigurdardottir ◽  
Hilma Ros Omarsdóttir ◽  
Anna Sigridur Valgeirsdottir

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.


2018 ◽  
Author(s):  
Alasdair D F Clarke ◽  
Jessica Irons ◽  
Warren James ◽  
Andrew B. Leber ◽  
Amelia R. Hunt

A striking range of individual differences has recently been reported in three different visual search tasks. These differences in performance can be attributed to strategy, that is, the efficiency with which participants control their search to complete the task quickly and accurately. Here we ask if an individual's strategy and performance in one search task is correlated with how they perform in the other two. We tested 64 observers in the three tasks mentioned above over two sessions. Even though the test-retest reliability of the tasks is high, an observer's performance and strategy in one task did not reliably predict their behaviour in the other two. These results suggest search strategies are stable over time, but context-specific. To understand visual search we therefore need to account not only for differences between individuals, but also how individuals interact with the search task and context. These context-specific but stable individual differences in strategy can account for a substantial proportion of variability in search performance.


2011 ◽  
Vol 11 (11) ◽  
pp. 1294-1294
Author(s):  
S. Utz ◽  
G. W. Humphreys ◽  
J. P. McCleery

2019 ◽  
Vol 19 (10) ◽  
pp. 311b
Author(s):  
Zachary A Lively ◽  
Gavin JP Ng ◽  
Simona Buetti ◽  
Alejandro Lleras

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