Skip to main content
Journal cover image

The temporal dynamics of the effects in occipital cortex of visual-spatial selective attention.

Publication ,  Journal Article
Woldorff, MG; Liotti, M; Seabolt, M; Busse, L; Lancaster, JL; Fox, PT
Published in: Brain Res Cogn Brain Res
December 2002

The temporal dynamics of the effects of lateralized visual selective attention within the lower visual field were studied with the combined application of event-related potentials (ERPs) and positron emission tomography (15O PET). Bilateral stimuli were rapidly presented to the lower visual field while subjects either passively viewed them or covertly attended to a designated side to detect occasional targets. Lateralized attention resulted in strongly enhanced PET activity in contralateral dorsal occipital cortex, while ERPs showed an enhanced positivity (P1 effect, 80-160 ms) for all stimuli (both non-targets and targets) over contralateral occipital scalp. Dipole modeling seeded by the dorsal occipital PET foci yielded an excellent fit for the peak P1 attention effect. However, more detailed ERP modeling throughout the P1 latency window (90-160 ms) suggested a spatial-temporal movement of the attention-related enhancement that roughly paralleled the shape of the dorsal occipital PET attention-related activations-likely reflecting the sequential attention-related enhancement of early visual cortical areas. Lateralized spatial attention also resulted in a longer-latency contralateral enhanced negativity (N2 effect, 230-280 ms) with a highly similar distribution to the earlier P1 effect. Dipole modeling seeded by the same dorsal occipital PET foci also yielded an excellent fit. This pattern of results provides evidence for re-entrance of attention-enhanced activation to the same retinotopically organized region of dorsal extrastriate cortex. Finally, target stimuli in the attended location elicited an additional prolonged enhancement of the longer-latency negativity over contralateral occipital cortex. The combination of PET activation and dipole modeling suggested contribution from a ventral-occipital generator to this target-related activity.

Duke Scholars

Published In

Brain Res Cogn Brain Res

DOI

ISSN

0926-6410

Publication Date

December 2002

Volume

15

Issue

1

Start / End Page

1 / 15

Location

Netherlands

Related Subject Headings

  • Visual Perception
  • Visual Fields
  • Tomography, Emission-Computed
  • Time Factors
  • Space Perception
  • Photic Stimulation
  • Occipital Lobe
  • Models, Neurological
  • Magnetic Resonance Imaging
  • Humans
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Woldorff, M. G., Liotti, M., Seabolt, M., Busse, L., Lancaster, J. L., & Fox, P. T. (2002). The temporal dynamics of the effects in occipital cortex of visual-spatial selective attention. Brain Res Cogn Brain Res, 15(1), 1–15. https://doi.org/10.1016/s0926-6410(02)00212-4
Woldorff, M. G., M. Liotti, M. Seabolt, L. Busse, J. L. Lancaster, and P. T. Fox. “The temporal dynamics of the effects in occipital cortex of visual-spatial selective attention.Brain Res Cogn Brain Res 15, no. 1 (December 2002): 1–15. https://doi.org/10.1016/s0926-6410(02)00212-4.
Woldorff MG, Liotti M, Seabolt M, Busse L, Lancaster JL, Fox PT. The temporal dynamics of the effects in occipital cortex of visual-spatial selective attention. Brain Res Cogn Brain Res. 2002 Dec;15(1):1–15.
Woldorff, M. G., et al. “The temporal dynamics of the effects in occipital cortex of visual-spatial selective attention.Brain Res Cogn Brain Res, vol. 15, no. 1, Dec. 2002, pp. 1–15. Pubmed, doi:10.1016/s0926-6410(02)00212-4.
Woldorff MG, Liotti M, Seabolt M, Busse L, Lancaster JL, Fox PT. The temporal dynamics of the effects in occipital cortex of visual-spatial selective attention. Brain Res Cogn Brain Res. 2002 Dec;15(1):1–15.
Journal cover image

Published In

Brain Res Cogn Brain Res

DOI

ISSN

0926-6410

Publication Date

December 2002

Volume

15

Issue

1

Start / End Page

1 / 15

Location

Netherlands

Related Subject Headings

  • Visual Perception
  • Visual Fields
  • Tomography, Emission-Computed
  • Time Factors
  • Space Perception
  • Photic Stimulation
  • Occipital Lobe
  • Models, Neurological
  • Magnetic Resonance Imaging
  • Humans