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Abstract rules drive adaptation in the subcortical sensory pathway
Alejandro Tabas1,2, Glad Mihai1,2, Stefan Kiebel1,3
1Faculty of Psychology, Technische Universität Dresden, Dresden, Germany.
Elife
|December 8, 2020
Summary
Neural pathways adapt to sensory input, but new research shows abstract expectations, not just stimulus statistics, drive auditory responses. This reveals prior beliefs influence early sensory processing.
Area of Science:
- Neuroscience
- Cognitive Science
- Sensory Processing
Background:
- Subcortical sensory pathways map external stimuli to the brain.
- Neural responses adapt to local stimulus statistics for efficient information transmission.
- Traditionally, reduced neural activity with stimulus regularity explained this adaptation.
Purpose of the Study:
- To investigate if abstract expectations, independent of local stimulus statistics, influence neural responses in subcortical sensory pathways.
- To provide evidence for expectation-driven coding in early sensory processing.
Main Methods:
- Utilized abstract rules to manipulate auditory stimulus expectations.
- Employed ultra-high-field functional magnetic resonance imaging (fMRI) in human participants.
- Measured neural response amplitudes in the auditory pathway.
Main Results:
- Abstract expectations were shown to directly modulate the amplitude of neural responses to auditory tones.
- This modulation occurred within the human auditory pathway, a subcortical structure.
- Demonstrated that expectations can drive neural responses independently of local stimulus statistics.
Conclusions:
- Provides the first unambiguous evidence for abstract processing in a subcortical sensory pathway.
- Suggests that prior beliefs and expectations significantly alter neural representations even at the earliest stages of sensory processing.
- Challenges the long-standing view that neural adaptation solely relies on stimulus regularities.
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