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Electrophysiological index of acoustic temporal regularity violation in the middle latency range
Sumie Leung1, Marc Recasens, Sabine Grimm
1Institute for Brain, Cognition and Behavior (IR3C), University of Barcelona, Catalonia, Spain; Cognitive Neuroscience Research Group, Department of Psychiatry and Clinical Psychobiology, University of Barcelona, Catalonia, Spain.
Objective:
Acoustic violations in temporal regularity have been traditionally indexed by mismatch negativity (MMN). However, recent studies have demonstrated that humans can detect auditory changes in physical sound features, such as frequency, location and intensity, in the first 50 ms after sound onset. Our aim was to examine if temporal regularity violations could be detected in the middle latency range.
Methods:
We used an oddball paradigm with 290 ms as standard stimulus onset asynchrony (SOA) and 200 ms as deviant SOA. We also employed a control paradigm that comprised of seven SOAs including 200 and 290 ms, in order to control for differences due to refractoriness.
Results:
In the middle latency range, temporal regularity violations led to enhanced Pa and Nb responses, which behaved differently to the corresponding SOAs in the control condition. In the long latency range, temporal regularity violations led to similar behaviours in both oddball and control paradigms.
Conclusions:
These findings suggest that with a fast presentation rate, human brains are capable to detect temporal regularity violations in the middle latency range.
Significance:
Together with previous studies that found early change detection responses, the current study emphasises that the human brain can encode simple regularity violation as early as approximately 50 ms post-stimulus onset.
Insights
The human brain detects temporal regularity violations in auditory stimuli within the middle latency range, even with rapid sound presentation. This indicates early auditory change detection capabilities around 50 ms post-stimulus onset.
Area of Science:
- Auditory Neuroscience
- Cognitive Neuroscience
- Human Brain Activity
Background:
- Mismatch negativity (MMN) traditionally indexes acoustic violations in temporal regularity.
- Recent research shows auditory change detection in physical sound features occurs within 50 ms of sound onset.
- The capacity for detecting temporal regularity violations in the middle latency range remains less understood.
Purpose of the Study:
- To investigate the detection of temporal regularity violations within the middle latency range of auditory processing.
- To compare brain responses to temporal regularity violations under different stimulus presentation rates.
- To explore the timing of auditory change detection for temporal regularity.
Main Methods:
- Utilized an oddball paradigm with standard (290 ms) and deviant (200 ms) stimulus onset asynchronies (SOA).
- Employed a control paradigm with seven SOAs (including 200 and 290 ms) to account for refractoriness.
- Analyzed auditory evoked potentials, specifically the P1 (Pa) and N1 (Nb) components, in the middle and long latency ranges.
Main Results:
- Temporal regularity violations elicited enhanced Pa and Nb responses in the middle latency range.
- These middle latency responses differed between the oddball and control conditions.
- In the long latency range, similar response patterns were observed in both oddball and control paradigms.
Conclusions:
- The human brain can detect temporal regularity violations in the middle latency range, particularly with fast stimulus presentation rates.
- These findings, combined with prior research on early change detection, highlight the brain's ability to encode simple regularity violations as early as 50 ms post-stimulus onset.
- This suggests a rapid and efficient mechanism for processing temporal auditory information.
