Modulation of visual stimulus discrimination by sustained focal attention

an MEG study

Karin Stefanie Pilz, Christoph Braun, Elke Altpeter, Michael McKeben, Susanne Trauzettel-Klosinski

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Visual attention, normally focused on the center of the visual field, can be shifted to a location in the periphery. This process facilitates the recognition of objects in the attended region. The present experiment was designed to investigate the time course of sustained attention that is known to augment stimulus perception in normal subjects.
METHODS: Cortical activity of the human brain related to shifts of the attentional focus was examined with magnetoencephalography. Subjects had to identify a stimulus presented on a screen at one of two locations in the periphery of their visual fields. Sustained attention was either deployed toward the target by a preceding cue or not.
RESULTS: Results confirmed a reaction time advantage on recognizing objects in the part of the visual field where attention had been deployed. A stronger magnetic brain response was detected for noncued targets at a latency of 260 to 380 ms after target onset. Source localization revealed a neuronal generator of the attention-related component in the parietal cortex.
CONCLUSIONS: Sustained attention facilitates target detection. The component that is localized in the parieto-occipital cortex in the noncued condition is thought to reflect a transient shift of attention toward the target location.
Original languageEnglish
Pages (from-to)1225-1229
JournalInvestigative Ophthalmology & Visual Science
Volume47
Issue number3
DOIs
Publication statusPublished - Mar 2006

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Visual Fields
Magnetoencephalography
Occipital Lobe
Parietal Lobe
Brain
Discrimination (Psychology)
Human Activities
Reaction Time
Cues

Keywords

  • spatial attention
  • electrophysiological evidence
  • macular scotoma
  • human brain
  • magnetoencephalography
  • detectability
  • space
  • tasks

Cite this

Modulation of visual stimulus discrimination by sustained focal attention : an MEG study. / Pilz, Karin Stefanie; Braun, Christoph; Altpeter, Elke; McKeben, Michael; Trauzettel-Klosinski, Susanne.

In: Investigative Ophthalmology & Visual Science, Vol. 47, No. 3, 03.2006, p. 1225-1229.

Research output: Contribution to journalArticle

Pilz, KS, Braun, C, Altpeter, E, McKeben, M & Trauzettel-Klosinski, S 2006, 'Modulation of visual stimulus discrimination by sustained focal attention: an MEG study', Investigative Ophthalmology & Visual Science, vol. 47, no. 3, pp. 1225-1229. https://doi.org/10.1167/iovs.04-1338
Pilz, Karin Stefanie ; Braun, Christoph ; Altpeter, Elke ; McKeben, Michael ; Trauzettel-Klosinski, Susanne. / Modulation of visual stimulus discrimination by sustained focal attention : an MEG study. In: Investigative Ophthalmology & Visual Science. 2006 ; Vol. 47, No. 3. pp. 1225-1229.
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