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Perirhinal cortex supports acquired fear of auditory objects
Sun Jung Bang1, Thomas H Brown
1Department of Psychology, Yale University, New Haven, CT 06520, USA.
Neurobiology of Learning and Memory
|February 3, 2009
Summary
Damage to the perirhinal cortex (PR) impairs fear conditioning to discontinuous sounds but not continuous ones. This suggests PR is crucial for processing temporal auditory patterns, not just sound frequency.
Area of Science:
- Neuroscience
- Auditory Processing
- Fear Conditioning
Background:
- Perirhinal cortex (PR) damage impairs fear conditioning to ultrasonic vocalizations (USVs) but not continuous tones.
- USVs possess temporal discontinuities, unlike continuous tones.
- PR is hypothesized to integrate auditory segments into unified representations for fear conditioning.
Purpose of the Study:
- To investigate if PR damage affects fear conditioning to other discontinuous auditory cues.
- To determine if the temporal structure of a sound, not just its frequency, is critical for PR's role in fear conditioning.
Main Methods:
- Fear conditioning was tested in control and PR-damaged rats using a 53kHz USV, a 53kHz continuous tone, and a 53kHz discontinuous tone.
- The auditory cues were matched for duration, loudness, and frequency.
- The discontinuous tone's pattern mimicked the 53kHz USV's call structure.
Main Results:
- PR-damaged rats showed significant impairment in fear conditioning to both the 53kHz USV and the 53kHz discontinuous tone.
- Rats with PR damage were unimpaired in fear conditioning to the 53kHz continuous tone.
- These findings indicate PR damage specifically affects conditioning to temporally discontinuous auditory stimuli.
Conclusions:
- The perirhinal cortex is essential for fear conditioning to sounds with temporal discontinuities.
- PR's function may involve integrating temporally separated auditory information into coherent "auditory objects".
- This temporal processing role of PR is critical for associative learning, such as fear conditioning.
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