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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
Published on: October 24, 2012
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Frequency-dependent auditory space representation in the human planum temporale
1Human Cognitive Neuroscience Lab, Department of Psychology, Social Sciences Faculty, The Hebrew University of Jerusalem Jerusalem, Israel.
Frontiers in Human Neuroscience
|August 8, 2014
Summary
This study investigated how the human brain
Area of Science:
- Neuroscience
- Auditory Perception
- Cognitive Neuroscience
Background:
- Functional magnetic resonance imaging (fMRI) suggests the planum temporale (PT) processes acoustic spatial information.
- The role of spectral content in this spatial representation remains unclear.
Purpose of the Study:
- To determine if spatial sound representation in the PT is frequency-dependent or generalizes across spectral content.
- To investigate the nature of higher-order sensory representations in the human brain.
Main Methods:
- A sparse-fMRI experiment was conducted using virtual acoustic environments.
- Participants experienced sounds with varying spectral content and spatial locations across three conditions: Single Location, Fixed Mapping, and Mixed Mapping.
Main Results:
- Adaptation to spatial location was confirmed in the PT.
- Brain activation was significantly higher in Mixed Mapping blocks compared to Fixed Mapping blocks.
- This indicates that spatially tuned neurons in the PT are sensitive to spectral content.
Conclusions:
- Spatial tuning in the human PT is not invariant to the spectral content of sounds.
- This finding has implications for understanding auditory spatial processing and sensory integration.
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