Double-epoch subtraction reveals long-latency mismatch response in urethane-anaesthetized mice

O'Reilly, Jamie A. (2019) Double-epoch subtraction reveals long-latency mismatch response in urethane-anaesthetized mice. Journal of Neuroscience Methods, 326. 108375. ISSN 0165-0270

[img]
Preview
Text (OReilly-JNM2019-Double-epoch-subtraction-reveals-long-latency-mismatch-response)
OReilly_JNM2019_Double_epoch_subtraction_reveals_long_latency_mismatch_response.pdf
Accepted Author Manuscript
License: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 logo

Download (728kB)| Preview

    Abstract

    Background: Anaesthetized rodents are examined for their capacity to model human mismatch negativity (MMN). In the present study, oddball and deviant-alone control paradigms, with stimuli varying in frequency (ascending and descending) and intensity (louder and quieter), were presented to anaesthetized mice to determine whether they elicit a translational mismatch response (MMR). New method: Resulting waveforms displayed long-latency (>200 ms post-stimulus) components, only made fully visible from oddball paradigm data by applying a double-epoch subtraction. In this approach, an extended epoch containing two consecutive standard evoked responses was subtracted from the response to an oddball followed by a standard (i.e. oddball:standard – standard:standard). Results: The trailing standard responses effectively cancelled each other out, revealing biphasic long-latency components. These MMR waveforms correlated strongly with deviant-alone paradigm evoked potentials >200 ms post-stimulus, potentially indicative of shared underlying mechanisms. Interestingly, these components were absent from the quieter oddball MMR. Comparison with existing method(s): Classical mismatch negativity computation is incapable of fully characterizing the long-latency biphasic response observed from this study, due to the inbuilt constraint of a single stimulus epoch. These results also suggest that the deviant-alone paradigm may be considered akin to a positive control for sensory-memory disruption, widely thought to be at the root of MMN generation in humans. Conclusions: Long-latency auditory evoked potential components are observed from anaesthetized mice in response to frequency and increasing intensity oddball stimuli. These display some congruencies with human MMN.