Temporal dynamics of visual-evoked neuromagnetic sources: Effects of stimulus parameters and selective attention

Aine, Cheryl J.; Supek, Selma; George, John

doi:10.3109/00207459508986095

Cited by 75 publications

(33 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fourth, our fMRI measurements might reflect reactivation of V1 caused by feedback from extrastriate cortical areas (39). Event-related potentials cannot determine whether the source of these longer latency signals are from delayed responses in V1 or from responses in extrastriate areas.…”

Section: Discussionmentioning

confidence: 96%

Spatial attention affects brain activity in human primary visual cortex

Gandhi

Heeger²,

Boynton

1999

Proc. Natl. Acad. Sci. U.S.A.

592

385

View full text Add to dashboard Cite

Biochemistry. In the article "Clonal selection and in vivo quantitation of protein interactions with protein-fragment complementation assays" by Ingrid Remy and Stephen W. Michnick, which appeared in number 10, May 11, 1999, of Proc. Natl. Acad. Sci. USA (96, 5394-5399) Immunology. In the article entitled "Murine natural killer cells contribute to the granulomatous reaction caused by mycobacterial cell walls" by I. Apostolou, Y. Takahama, C. Belmant, T. Kawano, M. Huerre, G. Marchal, J. Cui, M. Taniguchi, H. Nakauchi, J.-J. Fournié, P. Kourilsky, and G. Gachelin, which appeared in number 9, April 27, 1999 of Proc. Natl. Acad. Sci. USA (96,(5141)(5142)(5143)(5144)(5145)(5146), the authors request that the following correction be noted: the title should be "Murine natural killer T (NKT) cells contribute to the granulomatous reaction caused by mycobacterial cell walls." Neurobiology. In the articles "An empirical basis for Mach bands" by R. Beau Lotto, S. Mark Williams, and Dale Purves, which appeared in number 9, April 27, 1999, of Proc. Natl. Acad. Sci. USA (96,(5239)(5240)(5241)(5242)(5243)(5244), and "Mach bands as empirically derived associations" by R. Beau Lotto, S. Mark Williams, and Dale Purves, which appeared in number 9, April 27, 1999, of Proc. Natl. Acad. Sci. USA (96,(5245)(5246)(5247)(5248)(5249)(5250), the following correction should be noted. The reproduction of some of the figures in these papers was unsatisfactory due to the presence of moiré patterns and other deficiencies in the published versions. Given the difficulty in faithfully reproducing gradients in print, readers may wish to view the electronic versions of the figures at purveslab.neuro.duke.edu.Psychology. In the article "Spatial attention affects brain activity in human primary visual cortex" by Sunil P. Gandhi, David J. Heeger, and Geoffrey M. Boynton, which appeared in number 6, March 16, 1999, of Proc. Natl. Acad. Sci. USA (96, 3314-3319), due to an error in the PNAS office, a sentence was omitted. The sentence is shown in bold type in context in the complete paragraph below.On the other hand, it is certainly possible that the V1 modulation we observed might have nothing to do with the improved behavioral performance. For example, the memory load differs between the tasks in the main experiment and the spatial uncertainty experiment. In the spatial uncertainty experiment, subjects must remember two speeds instead of one during the 250 msec inter-stimulus interval. This difference in memory load might be causing the improved behavioral performance. Or the improved performance may result from subjects simply ignoring information from the uncued side, and thus may not be causally related to V1 modulation. It is difficult, however, to imagine that such a significant modulation of activity in visual cortex would fail to have consequences on perceptual thresholds. 7610Corrections Proc. Natl. Acad. Sci. USA 96 (1999) Communicated by Jacob Nachmias, University of Pennsylvania, Philadelphia, PA, December 21, 1998 (received for review...

show abstract

Section: Discussionmentioning

confidence: 96%

Spatial attention affects brain activity in human primary visual cortex

Gandhi

Heeger²,

Boynton

1999

Proc. Natl. Acad. Sci. U.S.A.

592

385

View full text Add to dashboard Cite

show abstract

“…A similar lack of attentional sensitivity for the initial C1 component has been observed in electrophysiological studies of spatial attention [AnlloVento and Hillyard, 1996;Clark and Hillyard, 1996;Gomez Gonzalez et al, 1994;Johannes et al, 1995;Mangun et al, 1993]. Although an effect of spatial attention on presumed striate cortex activity has been reported [Aine et al, 1995], this modulation occurred at 150 ms, well after the point of initial afference, suggesting reactivation of striate cortex due to feedback from higher visual areas. PET studies of selective attention to various features of a stimulus, including color and location, have similarly failed to observe any changes in striate activity as a function of attention [Corbetta et al, 1990[Corbetta et al, , 1991Heinze et al, 1994].…”

Section: Early Evoked Cortical Activitymentioning

confidence: 83%

Spatio-temporal dynamics of attention to color: Evidence from human electrophysiology

1998

View full text Add to dashboard Cite

This study characterized patterns of brain electrical activity associated with selective attention to the color of a stimulus. Multichannel recordings of event-related potentials (ERPs) were obtained while subjects viewed randomized sequences of checkerboards consisting of isoluminant red or blue checks superimposed on a grey background. Stimuli were presented foveally at a rapid rate, and subjects were required to attend to the red or blue checks in separate blocks of trials and to press a button each time they detected a dimmer target stimulus of the attended color. An early negative ERP component with an onset latency of 50 ms was sensitive to stimulus color but was unaffected by the attentional manipulation. ERPs elicited by attended and unattended stimuli began to diverge after approximately 100 ms following stimulus onset. Inverse dipole modelling of the attended-minus-unattended difference waveform indicated that an initial positive deflection with an onset latency of 100 ms had a source in lateral occipital cortex, while a subsequent negative deflection with an onset at 160 ms had a source in inferior occipito-temporal cortex. Longer-latency attention-sensitive components were localized to premotor frontal areas (onset at 190 ms) and to more anterior regions of the fusiform gyrus (onset at 240 ms). These source localizations correspond closely with cortical areas that were identified in previous neuroimaging studies as being involved in color-selective processing. The present ERP data thus provide information about the time course of stimulus selection processes in cortical areas that subserve attention to color.

show abstract

“…By this feedback mechanism, visuospatial attention may enhance the perceptual salience of the target element from the surrounding distractors [Mehta et al, 2000a,b;Lamme and Spekreijse, 2000;Super et al, 2001]. Previous studies using voluntary attention tasks have found that such a feedback takes place at 150 ms [Aine et al, 1995;Di Russo et al, 2003;Martinez et al, 1999Martinez et al, , 2001bNoesselt et al, 2002] or later than 200 ms after stimulus onset [Olsen et al, 2001], possibly due to different stimuli and tasks. Nevertheless, all these studies observed the reactivation from feedback after attentional modulation in extrastriate cortex, with the ERP or source waveforms at the time range overlapping the descending portion of N1 and P2 component.…”

Section: Discussionmentioning

confidence: 99%

Brain mechanisms of involuntary visuospatial attention: An event‐related potential study

Greenwood

Parasuraman

2005

Human Brain Mapping

View full text Add to dashboard Cite

The brain mechanisms mediating visuospatial attention were investigated by recording event-related potentials (ERPs) during a line-orientation discrimination task. Nonpredictive peripheral cues were used to direct participant's attention involuntarily to a spatial location. The earliest attentional modulation was observed in the P1 component (peak latency about 130 ms), with the valid trials eliciting larger P1 than invalid trials. Moreover, the attentional modulations on both the amplitude and latency of the P1 and N1 components had a different pattern as compared to previous studies with voluntary attention tasks. In contrast, the earliest visual ERP component, C1 (peak latency about 80 ms), was not modulated by attention. Low-resolution brain electromagnetic tomography (LORETA) showed that the earliest attentional modulation occurred in extrastriate cortex (middle occipital gyrus, BA 19) but not in the primary visual cortex. Later attention-related reactivations in the primary visual cortex were found at about 110 ms after stimulus onset. The results suggest that involuntary as well as voluntary attention modulates visual processing at the level of extrastriate cortex; however, at least some different processes are involved by involuntary attention compared to voluntary attention. In addition, the possible feedback from higher visual cortex to the primary visual cortex is faster and occurs earlier in involuntary relative to voluntary attention task.

show abstract

Temporal dynamics of visual-evoked neuromagnetic sources: Effects of stimulus parameters and selective attention

Cited by 75 publications

References 71 publications

Spatial attention affects brain activity in human primary visual cortex

Spatial attention affects brain activity in human primary visual cortex

Spatio-temporal dynamics of attention to color: Evidence from human electrophysiology

Brain mechanisms of involuntary visuospatial attention: An event‐related potential study

Contact Info

Product

Resources

About