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Updated: Jun 27, 2026
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Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients
Published on: June 17, 2019
Human Single-Neuron Responses to Multi-Feature Auditory Deviants: Evidence From Medial Temporal Lobe
Vinícius R Carvalho1, Alejandro Hugo Nasimbera2, Silvia Kochen2
1Department of Psychology, RITMO Centre for Interdisciplinary Studies in Rhythm, Time and Motion, University of Oslo, Oslo, Norway.
The European Journal of Neuroscience
|June 25, 2026
Summary
This study reveals how the human amygdala processes unexpected sounds, showing early suppression and later enhancement, particularly for timing changes. Hippocampal responses were minimal, suggesting limited roles in passive auditory deviance detection.
Area of Science:
- Neuroscience
- Auditory Perception
- Human Electrophysiology
Background:
- Auditory deviance detection is crucial for adaptive behavior.
- Mismatch negativity is a known indicator, but human single-unit data is scarce.
- Understanding cellular mechanisms of predictive auditory processing is vital.
Purpose of the Study:
- To characterize single and multi-unit responses to multi-feature auditory deviants in humans.
- To investigate neural responses in the amygdala, hippocampus, Heschl's gyrus, and insula.
- To provide the first human single-unit characterization of multi-feature auditory deviance processing.
Main Methods:
- Used the Optimum-1 multi-feature oddball paradigm during unattended listening.
- Performed microwire recordings from 13 epilepsy patients.
- Analyzed single and multi-unit responses to frequency, location, intensity, and timing deviants.
Main Results:
- Amygdala showed multi-phase responses: timing deviants elicited early suppression (~60ms) and later enhancement (~200ms); intensity deviants caused suppression (~300ms).
- Hippocampus exhibited sparse engagement, with only a weak late effect for sound frequency.
- Heschl's gyrus and insula showed heterogeneous and feature-specific responses, including intensity and spatial processing.
Conclusions:
- Human amygdala exhibits temporally dissociable deviance encoding mechanisms at the subcortical level.
- Sparse hippocampal responses suggest limited involvement in passive auditory deviance detection.
- These findings establish a baseline for understanding cellular mechanisms of predictive auditory processing in humans.
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