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Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control
Published on: July 5, 2015
Using neuronal populations to study the mechanisms underlying spatial and feature attention.
Marlene R Cohen1, John H R Maunsell
1Harvard Medical School Department of Neurobiology and Howard Hughes Medical Institute, Boston, MA 02115, USA. cohenm@pitt.edu
Neuron
|June 22, 2011
Summary
Visual attention, both spatial and feature-based, modulates neuronal activity. While spatial attention impacts local neuronal groups, feature attention coordinates across brain hemispheres, suggesting a unified attentional mechanism.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Visual Perception
Background:
- Visual attention significantly impacts perception and neuronal responses.
- Debate exists on whether spatial and nonspatial attention share neuronal mechanisms.
- Retinotopic organization of the visual cortex influences attentional modulation.
Purpose of the Study:
- To compare the effects of feature and spatial attention on neuronal populations.
- To investigate how attention modulates local and spatially separated neuronal groups.
- To determine if attentional mechanisms are unified or distinct for different attention types.
Main Methods:
- Simultaneous neuronal recordings from multiple neurons in both hemispheres of V4.
- Comparison of neuronal activity under feature attention versus spatial attention.
- Analysis of firing rates and pairwise correlations in local neuronal populations.
Main Results:
- Both feature and spatial attention similarly modulate local neuronal populations, affecting firing rates and correlations.
- Spatial attention primarily affects local neuronal populations.
- Feature attention demonstrates coordinated modulation across hemispheres.
Conclusions:
- Findings support a unified attentional mechanism capable of modulating arbitrary neuronal subgroups.
- The brain employs a flexible system for attentional control, adaptable to different attentional demands.
- Understanding attentional mechanisms is crucial for explaining perception and cognitive function.
