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To better understand how the network subserves attentional shifts, we performed a parametric study in which subjects made either overt attentional shifts or covert attentional shifts at three different ... Studies examining activity in this visuospatial network during attentional shifts at a single rate have given conflicting reports about how the activity differs for overt and covert shifts. ... Marc Joliot, Alex Martin, Bernard Mazoyer, and Emmanuel Mellet for their thoughtful comments on the manuscript. We are grateful to Dr. Robert Cox for his tireless development of AFNI, and B. ...doi:10.1006/nimg.2001.0788 pmid:11467905 fatcat:5jvbedq2ezg3jpfxdaehs62jty
This fMRI study investigated stimulus-driven spatial attention using a virtual-environment video. ... We highlight the central role of the efficacy of stimulus-driven signals in both dorsal and ventral attention systems, with a dissociation of the efficacy of background salience versus distinctive events ... The involvement of dorsal parietal and premotor areas is common in fMRI studies of visuo-spatial attention (Corbetta and Shulman, 2002 ; see also Vandenberghe et al., 2001, showing a parametric relationship ...doi:10.1016/j.neuron.2011.02.020 pmid:21382559 pmcid:PMC3838954 fatcat:qtrhq734wjaero7q5k7rhssc3u
Journal of Cognitive Neuroscience
A parametric fMRI study of overt and covert shifts of visuospatial attention. Neuroimage, 14, 310-321 Botvinick, M. M., Braver, T. S., Barch, D. M., Carter, C. S., & Cohen, J. D. (2001). ... Anterior cingulate and the monitoring of response conflict: Evidence from an fMRI study of overt verb generation. Journal of Cognitive Neuroscience, 12, 298-309. Beauchamp, M. ...
Eye movements of three subjects were monitored while they performed tasks of covert and overt shifts of spatial attention. ... Monitoring eye movements is a critical aspect of experimental design for studies of spatial attention and visual perception. ... ACKNOWLEDGMENTS , and by a NARSAD young investigator award (K.S.L.). ...doi:10.1006/nimg.1999.0517 pmid:10686117 fatcat:denq7urxrjhfrcsrcxklmmsgc4
Journal of Cognitive Neuroscience
A parametric fMRI study of overt and covert shifts of visuospatial attention. Neuroimage, 14 310-321. Beschin, N., Basso, A., & Della Sala, S. (2060). ... A study of analysis parameters that influence the sensitivity of event-related fMRI analyses. Neuroimage, 11, 326-333. Hopfinger, J. B., Woldorff, M. G., Fletcher, E. M., & Mangun, G. R. (2001). ...
Journal of Cognitive Neuroscience
A parametric fMRI study of overt and covert shifts of visuospatial attention. Neuroimage, 14, 310-321. Beauvois, M. W., & Meddis, R. (1996). ... Recognition of interleaved melodies. An fMRI study. Annals of the New York Academy of Sciences, 999, 152-154. Bregman, A. S. (1990). Auditory scene analysis. Cambridge: MIT press. Bregman, A. ...
Human Brain Mapping
These patterns of activation were comparable in overt and covert orienting conditions. ... Subjects viewed the videos with or without eye-movements allowed (overt or covert orienting). ... The authors declare no conflict of interest, both in general and in relation to this study. ...doi:10.1002/hbm.22276 pmid:23616340 pmcid:PMC3786006 fatcat:gijisj4v7jba3bewpnt553fk5u
Frontal and posterior parietal activations have been reported in numerous studies of working memory and visuospatial attention. ... The spatial attention task required the subject to shift visual attention covertly in response to a centrally presented directional cue. ... ACKNOWLEDGMENTS The authors thank Yun-Hee Kim for assistance with developing the attention task, Cathy Callahan for assistance with MR scanning, and Shelly Huddle for assistance with data analysis. ...doi:10.1006/nimg.1999.0503 pmid:10600415 fatcat:ibxbamlrojdwfbvn66fxjfwizu
Six right-handed male subjects were selected from a pilot behavioural study in which system for visuospatial attention with regional functional specialization. ... One attention condition cortex, and in the mesial and lateral premotor cortices (Brodmann area 6). emphasized reflexive aspects of spatial orientation, while the other required controlled shifts of attention ... The attention tasks stimulus location, whereas the frontal activation was more involved covert peripheral shifts of attention directed by bound to overt motor responses. ...doi:10.1093/brain/120.3.515 pmid:9126062 fatcat:f26ienmuvbbwhbzhhxc6a32wou
We investigated if and when premotor structures are active during processing of a three-dimensional cube comparison task that requires dynamic visuospatial imagery. ... Functional neuroimaging studies have consistently revealed parietal and occipital cortex activity during dynamic visuospatial imagery. ... ACKNOWLEDGMENTS This work was funded in part by grants 7174 and 8184 of the Jubilä umsfonds der Oesterreichischen National Bank. ...doi:10.1006/nimg.2001.0850 pmid:11467902 fatcat:v5z3bdntercnlfywecfy2or3je
In some cases NMDA voltage modulations may be central, but gain and shift are also functions that monoaminergic systems express in CCC. ... But they may be part of the experience of those with other symptom constellations. Switching is an important mechanism to allow context to be applied appropriately to changing circumstances. ... A parametric fMRI study of overt and covert shifts of visuospatial attention. NeuroImage 14:310-21 Bender, S., Müller, B., Oades, R. D. & Sartory, G. 2001. ...doi:10.1017/s0140525x03370025 fatcat:b7wfigl5cvb3hey4mjqov5cpp4
If causal relationships link oculomotion and of visuospatial attention ). ... When subjects fixate centrally to investigate visuospatial attention, it is one of the most and are requested to detect a visual stimulus that diffused in this kind of literature. ... A parametric fMRI study of overt and covert shifts of visuospatial attention. Neuroimage 14, 310-321. 7. Helmholtz von H. (1867). ...doi:10.1016/j.cub.2004.01.054 pmid:14972685 fatcat:nhmdhxfghvdz5p4xgb6qcozvye
Choosing where to attend and the medial frontal cortex: an fMRI study. . ... This evidence suggests a common mechanism may underlie free selection, whether for covert attention or overt saccades. ... Freely chosen overt or covert orienting may also have occurred in the inter-trials intervals in previous fMRI studies. ...doi:10.1152/jn.90241.2008 pmid:18596189 pmcid:PMC2544456 fatcat:d3oidwu375cdjlmco3u24rrhru
Acknowledgments The data reported in this experiment have been deposited in National fMRI Data Center (http://www.fmridc.org). The accession number is 2-2000-1114K. ... And third, we hypothesized that such a network specific for spatial shifts of attention might resemble the network invoked in overt/ covert visuospatial shifts of attention studied with Posner-like paradigms ... Indeed, imaging techniques and patient studies revealed that similar parietal regions are involved in inefficient conjunction search and covert/ overt visuospatial shifts of attention (Corbetta, Shulman ...doi:10.1162/089892900564073 pmid:11506648 fatcat:7stfisb2t5hkrldcumfpfwkqce
Functional imaging studies of saccades and covert attention shifts in the normal Each area showed a bias towards contralateral stimuli, with two exceptions: the anterior insulae gave mainly brain, however ... When subjects made a covert visual assessment of the must covertly shift their attention to the left, suggesting that the right SMG is involved in the generation of peripheral stimulus without any saccade ... We were therefore able to make a valid comparison of saccades and covert attention shifts, and examine shifts to the left and to the right independently, without contamination of the fMRI signal by the ...doi:10.1093/brain/123.11.2273 pmid:11050027 fatcat:pehi7qk6i5a2vl3ia4dqfqlxte
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