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Stimulus-specific adaptation to behaviorally-relevant sounds in awake rats
Amit Yaron1,2, Maciej M Jankowski2, Ruan Badrieh1
1Department of Neurobiology, Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem, Israel.
Plos One
|March 27, 2020
Summary
Stimulus-specific adaptation (SSA) changes when sounds gain behavioral meaning. Fear conditioning in rats showed that learned associations alter how the brain processes familiar versus novel auditory stimuli.
Area of Science:
- Neuroscience
- Auditory Perception
- Learning and Memory
Background:
- Stimulus-specific adaptation (SSA) is a neural process where responses decrease to frequently heard stimuli, but not to novel ones.
- Previous SSA research primarily used sounds lacking behavioral significance.
- The role of learned behavioral meaning in modulating SSA remains largely unexplored.
Purpose of the Study:
- To investigate if acquiring behavioral meaning alters stimulus-specific adaptation (SSA).
- To test the hypothesis that learned associations modify SSA.
- To examine experience-dependent plasticity in auditory processing.
Main Methods:
- Rats underwent fear conditioning using word-like auditory stimuli (CS+) paired with foot shock and (CS-) without shock.
- Neural responses to auditory stimuli were recorded telemetrically using multi-electrode arrays in freely moving animals.
- Recordings were conducted before and after auditory fear conditioning to assess changes in SSA.
Main Results:
- SSA was significantly shaped by the behavioral relevance of the auditory stimuli.
- For the CS+ (danger) stimulus, SSA contrast decreased or remained stable, while for the CS- (safety) stimulus, SSA contrast increased.
- Sensory responses generally increased post-conditioning, with an unexpected, significant decrease in responses to CS+ word-like stimuli, suggesting inhibitory plasticity.
Conclusions:
- Acquisition of behavioral meaning, through fear conditioning, dynamically modulates stimulus-specific adaptation (SSA).
- Experience-dependent changes in SSA reflect the brain's adaptation to the learned significance of auditory cues.
- The findings suggest substantial inhibitory plasticity underlies the processing of behaviorally relevant auditory stimuli.
