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Related Experiment Video

Updated: May 11, 2026

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
08:45

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

Spatial attention increases high-frequency gamma synchronisation in human medial visual cortex.

Loes Koelewijn1, Anina N Rich, Suresh D Muthukumaraswamy

  • 1Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff University, Park Place, Cardiff CF103AT, UK. koelewijnl@Cardiff.ac.uk

Neuroimage
|May 9, 2013
PubMed
Summary
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Spatial attention enhances gamma synchronisation in human early visual cortex, specifically at higher frequencies (60-90 Hz). This finding localizes attentional effects to early visual areas, suggesting distinct frequency bands for stimulus and goal-driven processing.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Neuroscience

Background:

  • Neuronal communication underlies visual processing, integrating stimulus and goal-driven information.
  • Gamma synchronisation is crucial for neuronal communication and modulated by stimulus properties and attention.
  • Attentional effects on gamma activity are typically observed in higher visual areas (e.g., V4), contrasting with stimulus-driven effects in early visual areas (e.g., V1).

Purpose of the Study:

  • To investigate the effect of spatial attention on gamma activity in human early visual cortex.
  • To determine if attentional modulation of gamma activity occurs in early visual areas.
  • To differentiate stimulus-driven and goal-driven modulations of gamma activity within the gamma frequency range.

Main Methods:

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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Related Experiment Videos

Last Updated: May 11, 2026

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
08:45

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

  • Magnetoencephalography (MEG) was used to measure brain activity.
  • Participants performed a task involving attending to either a gamma-inducing grating or a fixation line.
  • Stimulus- and attention-driven gamma synchronisation were measured in medial and lateral visual cortex at different frequencies.

Main Results:

  • Gamma synchronisation (30-70 Hz and 60-90 Hz) was induced by the grating stimulus in medial and lateral visual cortex, irrespective of attention.
  • Directing spatial attention to the grating increased gamma synchronisation in medial visual cortex, but only within the 60-90 Hz range.
  • These results indicate that attentional modulation of gamma activity can be localized to early visual cortex.

Conclusions:

  • Spatial attention increases gamma synchronisation in human early visual cortex, specifically at higher gamma frequencies (60-90 Hz).
  • This localization challenges previous assumptions and suggests that early visual cortex is involved in attentional processing.
  • Stimulus-driven and goal-driven modulations of neural activity may be segregated by frequency bands within the gamma range.