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Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

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Published on: May 19, 2016

Dynamic changes in phase-amplitude coupling facilitate spatial attention control in fronto-parietal cortex.

Sara M Szczepanski¹, Nathan E Crone², Rachel A Kuperman³

¹Department of Psychology, University of California, Berkeley, Berkeley, California, United States of America; Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California, United States of America.

|August 27, 2014

Summary

This study reveals how the brain

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Area of Science:

Cognitive Neuroscience
Neurophysiology

Background:

Attention involves the fronto-parietal attentional control network.
Previous research used neuroimaging but lacked fine spatiotemporal resolution.
Dynamic interactions within this network remain poorly understood at sub-second scales.

Purpose of the Study:

To investigate the dynamic interactions within the human fronto-parietal network controlling visuospatial attention.
To examine these interactions on a fine spatiotemporal scale (sub-second, sub-centimeter).

Main Methods:

Electrocorticography (ECoG) signals were recorded from 8 patients with epilepsy.
Participants performed a spatial-cuing task requiring visuospatial attention.
High gamma (HG) power and delta/theta oscillations were analyzed.

Main Results:

Elevated HG power (70-250 Hz) was observed in frontal, parietal, and visual areas during attention allocation.
HG power increases were modulated by delta/theta (2-5 Hz) oscillation phase.
Delta/theta phase-HG amplitude coupling strength predicted reaction times on a trial-by-trial basis.

Conclusions:

Delta/theta phase-HG amplitude coupling is a key mechanism for sub-second attentional facilitation.
This coupling facilitates coordination within the human fronto-parietal cortex.
Momentary attentional demands guide these neural interactions.