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Published on: May 9, 2019
Small changes in temporal deviance modulate mismatch negativity amplitude in humans
Michael A Kisley1, Deana B Davalos, Heidi S Layton
1Department of Psychology, University of Colorado at Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80933-7150, USA. mkisley@uccs.edu
Abstract:
The relative sensitivity of mismatch negativity (MMN) amplitude to small changes in temporal (i.e. timing) deviance of an ongoing stimulus train was investigated. MMN was measured at Fz in response to 3.75-15% decrements of inter-stimulus interval from a 400 ms standard with a deviant probability of 1/15. This parameter space represents the smallest degree of deviance and the narrowest range of variation that has been tested in the context of MMN sensitivity to temporal variables. Waveform amplitude was found to significantly increase with degree of temporal deviance even within this relatively narrow parameter space. This finding is consistent with the view that the MMN corresponds to pre-attentive neural activity that subsequently allows the conscious perception of time during temporal discrimination tasks.
Insights
Mismatch negativity (MMN) amplitude shows sensitivity to subtle temporal changes in stimuli. Even small timing variations significantly increase MMN amplitude, reflecting pre-attentive processing of temporal information.
Area of Science:
- Neuroscience
- Auditory Perception
- Cognitive Psychology
Background:
- Mismatch negativity (MMN) is a neurophysiological measure reflecting automatic auditory change detection.
- Previous research has explored MMN sensitivity to various stimulus features, including temporal aspects.
Purpose of the Study:
- To investigate the sensitivity of mismatch negativity (MMN) amplitude to small temporal (timing) deviations in an auditory stimulus train.
- To determine the MMN's response within a parameter space representing minimal deviance and narrow variation ranges.
Main Methods:
- MMN was recorded at the Fz electrode.
- Stimuli consisted of a 400 ms standard inter-stimulus interval with deviant probabilities of 1/15.
- Temporal deviance was introduced through decrements of 3.75% to 15% in the inter-stimulus interval.
Main Results:
- MMN amplitude significantly increased with increasing degrees of temporal deviance.
- This sensitivity was observed even within the narrowest tested parameter space of temporal variation.
- The findings suggest MMN is responsive to subtle temporal changes.
Conclusions:
- The mismatch negativity (MMN) reflects pre-attentive neural activity sensitive to fine-grained temporal variations.
- This pre-attentive processing of temporal information may underpin conscious time perception during discrimination tasks.
