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The prosthetics of vigilant attention: random cuing cuts processing demands
Charlene O'Connor1, Ian H Robertson2, Brian Levine1
1Rotman Research Institute, University of Toronto.
Neuropsychology
|April 6, 2011
Summary
Alerting tones shifted attention from internal control to external cues, reducing brain network activity during vigilant tasks. This suggests a neural mechanism for aiding attention in individuals with impaired top-down control.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Attention Research
Background:
- Vigilant attention is influenced by external stimuli.
- Attention can shift from endogenous (internal) to exogenous (external) control.
- The right-lateralized fronto-parietal-thalamic network is crucial for vigilant attention.
Purpose of the Study:
- To investigate how exogenous stimulation affects the vigilant attention network.
- To examine the neural correlates of shifting from endogenous to exogenous attentional control.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used.
- Healthy participants performed the Sustained Attention to Response Task (SART).
- Auditory alerting tones were presented during SART blocks.
Main Results:
- Alerting tones did not significantly alter overall performance but caused transient response time increases.
- A diminished pattern of activation was observed in key nodes of the attention network.
- Right-lateralized activity and activation in the right middle frontal gyrus were attenuated.
Conclusions:
- Alerting tones facilitated a shift from endogenous to exogenous control.
- This shift reduced reliance on prefrontal control mechanisms.
- Findings suggest a neural basis for exogenous engagement benefits in attention disorders.
