scholarly journals Neural Correlates of Inter-Trial Priming and Role-Reversal in Visual Search

2011 ◽  
Vol 5 ◽  
Author(s):  
Christopher Rorden ◽  
Arni Kristjansson ◽  
Kathleen Pirog Revill ◽  
Styrmir Saevarsson
Keyword(s):  
Visual Search ◽  
Neural Correlates ◽  
Role Reversal

scholarly journals Neural correlates of central versus peripheral target detection during complex visual search

2011 ◽  
Vol 11 (11) ◽  
pp. 1294-1294
Author(s):  
S. Utz ◽  
G. W. Humphreys ◽  
J. P. McCleery
Keyword(s):  
Visual Search ◽  
Target Detection ◽  
Neural Correlates ◽  
Peripheral Target

Neural correlates of reward-driven attentional capture in visual search

2013 ◽  
Vol 1532 ◽  
pp. 32-43 ◽  
Author(s):  
Senqing Qi ◽  
Qinghong Zeng ◽  
Cody Ding ◽  
Hong Li
Keyword(s):  
Visual Search ◽  
Attentional Capture ◽  
Neural Correlates

scholarly journals Neural Correlates of Correct and Errant Attentional Selection Revealed Through N2pc and Frontal Eye Field Activity

2010 ◽  
Vol 104 (5) ◽  
pp. 2433-2441 ◽  
Author(s):  
Richard P. Heitz ◽  
Jeremiah Y. Cohen ◽  
Geoffrey F. Woodman ◽  
Jeffrey D. Schall
Keyword(s):  
Visual Search ◽  
Visual Processing ◽  
Neural Correlates ◽  
Event Related Potential ◽  
Covert Attention ◽  
Extrastriate Cortex ◽  
False Alarms ◽  
Frontal Eye Field ◽  
Physiological Basis ◽  
Eye Field

The goal of this study was to obtain a better understanding of the physiological basis of errors of visual search. Previous research has shown that search errors occur when visual neurons in the frontal eye field (FEF) treat distractors as if they were targets. We replicated this finding during an inefficient form search and extended it by measuring simultaneously a macaque homologue of an event-related potential indexing the allocation of covert attention known as the m-N2pc. Based on recent work, we expected errors of selection in FEF to propagate to areas of extrastriate cortex responsible for allocating attention and implicated in the generation of the m-N2pc. Consistent with this prediction, we discovered that when FEF neurons selected a distractor instead of the search target, the m-N2pc shifted in the same, incorrect direction prior to the erroneous saccade. This suggests that such errors are due to a systematic misorienting of attention from the initial stages of visual processing. Our analyses also revealed distinct neural correlates of false alarms and guesses. These results demonstrate that errant gaze shifts during visual search arise from errant attentional processing.

scholarly journals Visual search in depth: The neural correlates of segmenting a display into relevant and irrelevant three-dimensional regions

NeuroImage ◽  
2015 ◽  
Vol 122 ◽  
pp. 298-305 ◽  
Author(s):  
Katherine L. Roberts ◽  
Harriet A. Allen ◽  
Kevin Dent ◽  
Glyn W. Humphreys
Keyword(s):  
Visual Search ◽  
Three Dimensional ◽  
Neural Correlates

scholarly journals Neural Correlates of Learning During a Visual Search Task

2012 ◽  
Vol 12 (9) ◽  
pp. 765-765
Author(s):  
K. Clark ◽  
L. G. Appelbaum ◽  
S. R. Mitroff ◽  
M. G. Woldorff
Keyword(s):  
Visual Search ◽  
Search Task ◽  
Visual Search Task ◽  
Neural Correlates

scholarly journals A compositional neural code in high-level visual cortex can explain jumbled word reading

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Aakash Agrawal ◽  
KVS Hari ◽  
SP Arun
Keyword(s):  
Visual Search ◽  
Human Performance ◽  
Word Reading ◽  
Neural Correlates ◽  
Neural Code ◽  
Word Form ◽  
Visual Model ◽  
Visual Word Form Area ◽  
High Level ◽  
Letter Shape

We read jubmled wrods effortlessly, but the neural correlates of this remarkable ability remain poorly understood. We hypothesized that viewing a jumbled word activates a visual representation that is compared to known words. To test this hypothesis, we devised a purely visual model in which neurons tuned to letter shape respond to longer strings in a compositional manner by linearly summing letter responses. We found that dissimilarities between letter strings in this model can explain human performance on visual search, and responses to jumbled words in word reading tasks. Brain imaging revealed that viewing a string activates this letter-based code in the lateral occipital (LO) region and that subsequent comparisons to stored words are consistent with activations of the visual word form area (VWFA). Thus, a compositional neural code potentially contributes to efficient reading.

scholarly journals Parallel fast and slow recurrent cortical processing mediates target and distractor selection in visual search

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Sarah E. Donohue ◽  
Mircea A. Schoenfeld ◽  
Jens-Max Hopf
Keyword(s):  
Visual Cortex ◽  
Visual Search ◽  
Electric Fields ◽  
Neural Correlates ◽  
Opposite Polarity ◽  
Exact Nature ◽  
Behavioral Performance ◽  
Distractor Processing ◽  
Reentrant Processing

AbstractVisual search has been commonly used to study the neural correlates of attentional allocation in space. Recent electrophysiological research has disentangled distractor processing from target processing, showing that these mechanisms appear to operate in parallel and show electric fields of opposite polarity. Nevertheless, the localization and exact nature of this activity is unknown. Here, using MEG in humans, we provide a spatiotemporal characterization of target and distractor processing in visual cortex. We demonstrate that source activity underlying target- and distractor-processing propagates in parallel as fast and slow sweep from higher to lower hierarchical levels in visual cortex. Importantly, the fast propagating target-related source activity bypasses intermediate levels to go directly to V1, and this V1 activity correlates with behavioral performance. These findings suggest that reentrant processing is important for both selection and attenuation of stimuli, and such processing operates in parallel feedback loops.

scholarly journals Neural correlates of visual search in patients with hereditary retinal dystrophies

2012 ◽  
Vol 34 (10) ◽  
pp. 2607-2623 ◽  
Author(s):  
Tina Plank ◽  
Jozef Frolo ◽  
Fatima Farzana ◽  
Sabine Brandl-Rühle ◽  
Agnes B. Renner ◽  
...  
Keyword(s):  
Visual Search ◽  
Neural Correlates ◽  
Retinal Dystrophies ◽  
Hereditary Retinal Dystrophies

scholarly journals The interplay of attention and consciousness in visual search, attentional blink and working memory consolidation

2014 ◽  
Vol 369 (1641) ◽  
pp. 20130215 ◽  
Author(s):  
Antonino Raffone ◽  
Narayanan Srinivasan ◽  
Cees van Leeuwen
Keyword(s):  
Working Memory ◽  
Visual Search ◽  
Attentional Blink ◽  
Memory Consolidation ◽  
Inattentional Blindness ◽  
Phenomenal Consciousness ◽  
Neural Correlates ◽  
Illusory Conjunctions ◽  
The One ◽  
Multiple Processing

Despite the acknowledged relationship between consciousness and attention, theories of the two have mostly been developed separately. Moreover, these theories have independently attempted to explain phenomena in which both are likely to interact, such as the attentional blink (AB) and working memory (WM) consolidation. Here, we make an effort to bridge the gap between, on the one hand, a theory of consciousness based on the notion of global workspace ( GW ) and, on the other, a synthesis of theories of visual attention. We offer a theory of attention and consciousness ( TAC ) that provides a unified neurocognitive account of several phenomena associated with visual search, AB and WM consolidation. TAC assumes multiple processing stages between early visual representation and conscious access, and extends the dynamics of the global neuronal workspace model to a visual attentional workspace ( VAW ) . The VAW is controlled by executive routers , higher-order representations of executive operations in the GW, without the need for explicit saliency or priority maps. TAC leads to newly proposed mechanisms for illusory conjunctions, AB, inattentional blindness and WM capacity, and suggests neural correlates of phenomenal consciousness. Finally, the theory reconciles the all-or-none and graded perspectives on conscious representation.

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