Role of neural activity during inter-token intervals in sound sequence discrimination-1, Primary Auditory Cortex
A S Micheal1, S Bandyopadhyay1
1Information Processing Laboratory, Dept of E&ECE, IIT Kharagpur, India; Advanced Technology Development Centre, IIT Kharagpur, India.
Hearing Research
|June 7, 2026
Summary
Neurons in the auditory cortex show selectivity for periodic or aperiodic sound patterns. Inter-token interval activity is crucial for this auditory selectivity, influencing sound sequence processing.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Computational Neuroscience
Background:
- Auditory neurons are sensitive to changes in repeating acoustic patterns, crucial for communication and perception.
- Existing research primarily focuses on sensitivity and adaptation to sound regularity.
- Regular sound patterns play vital roles in social communication, stream segregation, and grouping across species.
Purpose of the Study:
- To investigate cortical selectivity for periodic versus aperiodic sound sequences.
- To examine how multiple stimulus attributes influence this selectivity.
- To understand the role of inter-token interval activity in auditory sequence processing.
Main Methods:
- Single unit electrophysiology in mouse auditory cortex (anesthetized and awake).
- Two-photon calcium imaging in mouse auditory cortex (anesthetized and awake).
- Analysis of neuronal responses to periodic and aperiodic sound sequences with varying attributes.
Main Results:
- Identified neuronal subpopulations selective for periodicity or aperiodicity.
- Observed lack of generalization across period-length, frequency-content, or inter-token interval durations.
- Demonstrated the significant role of inter-token interval spiking activity in sequence selectivity.
- Found identical average population rates for periodic and aperiodic stimuli, highlighting the importance of temporal dynamics.
Conclusions:
- Auditory cortex neurons exhibit specialized selectivity for sound sequence periodicity.
- Inter-token interval activity critically shapes auditory selectivity for periodic and aperiodic sequences.
- Neuronal responses are finely tuned to specific temporal features within sound sequences, rather than general patterns.
Keywords:
Distinct adaptationInter token intervalPeriodic and aperiodicPre-period build upPrimary auditory cortexSound sequenceMore Related Videos
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