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Somatosensory automatic responses to deviant stimuli

N Shinozaki1, H Yabe, T Sutoh

  • 1Department of Neuropsychiatry, Hirosaki University School of Medicine, Zaifu-cho 5, Hirosaki 036, Japan. shino@cc.hirosaki-u.ac.jp

Brain Research. Cognitive Brain Research
|October 17, 1998
PubMed
Summary

Researchers investigated event-related potentials (ERPs) to somatosensory changes. A novel somatosensory change-related positivity was identified, suggesting sensory memory comparison processes.

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Area of Science:

  • Neuroscience
  • Somatosensory System
  • Human Electrophysiology

Background:

  • Event-related potentials (ERPs) are crucial for understanding neural processing of sensory information.
  • Previous research has identified mismatch negativity in the somatosensory system.
  • Investigating responses to deviant stimuli in repetitive sequences is key to understanding sensory change detection.

Purpose of the Study:

  • To investigate event-related potentials (ERPs) elicited by deviant somatosensory stimuli within a repetitive sequence.
  • To characterize the neural correlates of detecting changes in somatosensory input under stimulus-ignoring conditions.
  • To differentiate novel ERP components from previously reported somatosensory mismatch negativity.

Main Methods:

  • Recording event-related potentials (ERPs) in human participants.

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  • Presenting sequences of repetitive somatosensory stimuli with deviant changes.
  • Analyzing ERPs under conditions where participants ignored the stimuli.
  • Modulating the interstimulus interval (ISI) to assess its effect on ERPs.

    • Main Results:

    • A frontal negativity, similar to somatosensory mismatch negativity, was observed in response to deviant stimuli.
    • A novel positive deflection, termed somatosensory change-related positivity, occurred between 100-200 ms latency.
    • This positivity was reduced with longer interstimulus intervals (ISIs).
    • The somatosensory change-related positivity differed from responses to deviant stimuli presented in isolation.

    Conclusions:

    • The findings suggest the somatosensory change-related positivity is not due to new afferent activation.
    • This positivity likely arises from a change detection process involving comparison with sensory memory.
    • The study identifies a distinct neural mechanism for processing novelty within the somatosensory system.