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Updated: Feb 9, 2026
08:49
Visualization of Cortical Modules in Flattened Mammalian Cortices
Published on: January 22, 2018
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Cortical volume and sex influence visual gamma.
Stan van Pelt1, Elena Shumskaya2, Pascal Fries1
1Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Kapittelweg 29, 6525 EN Nijmegen, The Netherlands; Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Deutschordenstraße 46, 60528 Frankfurt, Germany.
Neuroimage
|June 9, 2018
Summary
Visually induced gamma-band activity (GBA) is affected by stimulus properties and individual differences. Factors like contrast, velocity, age, cortical thickness, and sex influence GBA strength and frequency.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
Background:
- Visually induced gamma-band activity (GBA) is crucial for cognitive functions like perceptual binding and memory.
- GBA is known to be modulated by intrinsic (e.g., age) and extrinsic (e.g., stimulus contrast) factors.
Purpose of the Study:
- To investigate the relative contributions of various intrinsic and extrinsic factors on GBA.
- To explore the interactions between these factors in a large cohort.
Main Methods:
- Magnetoencephalography (MEG) was used to record brain activity in 158 subjects.
- Analysis focused on gamma strength and gamma peak frequency in response to visual stimuli.
Main Results:
- Gamma strength and peak frequency increased with stimulus contrast and velocity.
- Gamma peak frequency decreased with age and was higher in females and subjects with thicker occipital cortices.
- Intrinsic and extrinsic factors explained 20-21% of the variance in GBA.
Conclusions:
- Both stimulus properties and individual subject characteristics significantly influence GBA.
- Understanding these modulators is key to deciphering GBA's role in cognitive processes.
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