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BOLD correlates of edge detection in human auditory cortex
Marcus Herdener1, Fabrizio Esposito, Francesco Di Salle
1University Hospital of Psychiatry Bern, 3000 Bern, Switzerland. herdener@puk.unibe.ch
Neuroimage
|March 31, 2007
Summary
Sound offset, the change from sound to silence, is crucial for identifying auditory edges. Specific regions in the right temporal cortex respond to sound offsets, helping to create coherent auditory objects.
Area of Science:
- Neuroscience
- Auditory Perception
- Signal Processing
Background:
- Auditory edges, like sound onset and offset, define coherent auditory objects.
- Sound onset responses are well-studied but confounded by novel input.
- Sound offset provides a clearer model for studying neural activity related to auditory edges per se.
Purpose of the Study:
- To investigate the neural underpinnings of auditory edge detection, specifically focusing on sound offset.
- To identify brain regions involved in processing sound offset.
- To determine if offset-responsive regions also respond to other auditory edge-related stimuli.
Main Methods:
- Functional magnetic resonance imaging (fMRI) with silent acquisition was used to measure brain activity.
- Experiments involved presenting pulsed sounds and analyzing responses to sound offsets.
- Further experiments tested responses to single pulses, onsets, and omissions within pulse sequences.
Main Results:
- Sound offset activated specific regions in the right hemisphere: planum temporale, superior temporal sulcus, and planum polare.
- Offset response amplitude in the planum temporale and superior temporal sulcus correlated with the preceding sound pulse repetition rate.
- These regions also responded to single pulses, onsets, and omissions, but not sustained sound.
Conclusions:
- Circumscribed areas in the right temporal cortex are specifically involved in identifying auditory edges.
- This neural mechanism is essential for segmenting acoustic signals into meaningful auditory objects.
- The findings highlight the distinct role of sound offset processing in auditory perception.
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