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Functional magnetic resonance imaging measure of automatic and controlled auditory processing
Teresa V Mitchell1, Rajendra A Morey, Seniha Inan
1University of Massachusetts Medical School E.K. Shriver Center, Waltham, Massachusetts, USA.
Neuroreport
|March 17, 2005
Summary
Attention boosts brain activity in auditory regions when processing pitch changes. This enhancement, particularly in the superior temporal gyrus, may involve top-down control from the prefrontal cortex.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Auditory Perception
Background:
- The brain processes auditory information using various regions, including fronto-striato-temporal networks.
- Understanding how attention modulates neural responses to auditory stimuli is crucial for cognitive function.
Purpose of the Study:
- To investigate brain activity differences in fronto-striato-temporal regions during processing of unattended versus attended auditory stimuli.
- To explore the neural mechanisms underlying attention's effect on auditory deviance detection.
Main Methods:
- Event-related functional magnetic resonance imaging (fMRI) was employed.
- Analysis focused on activation patterns in the middle frontal gyrus, inferior frontal gyrus, anterior cingulate gyrus, superior temporal gyrus, thalamus, and basal ganglia.
Main Results:
- Unattended deviant tones strongly activated the superior temporal gyrus.
- Attended tones resulted in greater superior temporal gyrus activation compared to unattended tones.
- Attended tones also showed increased activation in frontal and striatal regions.
Conclusions:
- Attention enhances neural responses to auditory pitch deviance within auditory brain regions.
- Top-down control from the dorsolateral prefrontal cortex may mediate this attentional enhancement.
- This suggests a role for executive functions in modulating auditory perception.