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Stimulus-Specific Adaptation in the Auditory Thalamus of the Anesthetized Rat

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  • Flora M Antunes
  • Israel Nelken
  • Ellen Covey
  • Manuel S Malmierca

Abstract

The specific adaptation of neuronal responses to a repeated stimulus (Stimulus-specific adaptation, SSA), which does not fully generalize to other stimuli, provides a mechanism for emphasizing rare and potentially interesting sensory events. Previous studies have demonstrated that neurons in the auditory cortex and inferior colliculus show SSA. However, the contribution of the medial geniculate body (MGB) and its main subdivisions to SSA and detection of rare sounds remains poorly characterized. We recorded from single neurons in the MGB of anaesthetized rats while presenting a sequence composed of a rare tone presented in the context of a common tone (oddball sequences). We demonstrate that a significant percentage of neurons in MGB adapt in a stimulus-specific manner. Neurons in the medial and dorsal subdivisions showed the strongest SSA, linking this property to the non-lemniscal pathway. Some neurons in the non-lemniscal regions showed strong SSA even under extreme testing conditions (e.g., a frequency interval of 0.14 octaves combined with a stimulus onset asynchrony of 2000 ms). Some of these neurons were able to discriminate between two very close frequencies (frequency interval of 0.057 octaves), revealing evidence of hyperacuity in neurons at a subcortical level. Thus, SSA is expressed strongly in the rat auditory thalamus and contribute significantly to auditory change detection.

Suggested Citation

  • Flora M Antunes & Israel Nelken & Ellen Covey & Manuel S Malmierca, 2010. "Stimulus-Specific Adaptation in the Auditory Thalamus of the Anesthetized Rat," PLOS ONE, Public Library of Science, vol. 5(11), pages 1-15, November.
  • Handle: RePEc:plo:pone00:0014071
    DOI: 10.1371/journal.pone.0014071
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    Cited by:

    1. Robert Mill & Martin Coath & Thomas Wennekers & Susan L Denham, 2011. "A Neurocomputational Model of Stimulus-Specific Adaptation to Oddball and Markov Sequences," PLOS Computational Biology, Public Library of Science, vol. 7(8), pages 1-15, August.
    2. Guo, Yi & Wang, Jiang & Hong, Shouhai & Wei, Xile & Yu, Haitao & Deng, Bin, 2015. "Fractal characterization of acupuncture-induced spike trains of rat WDR neuronsAuthor-Name: Chen, Yingyuan," Chaos, Solitons & Fractals, Elsevier, vol. 77(C), pages 205-214.
    3. David Pérez-González & Olga Hernández & Ellen Covey & Manuel S Malmierca, 2012. "GABAA-Mediated Inhibition Modulates Stimulus-Specific Adaptation in the Inferior Colliculus," PLOS ONE, Public Library of Science, vol. 7(3), pages 1-14, March.
    4. Miriam Cornella & Sumie Leung & Sabine Grimm & Carles Escera, 2012. "Detection of Simple and Pattern Regularity Violations Occurs at Different Levels of the Auditory Hierarchy," PLOS ONE, Public Library of Science, vol. 7(8), pages 1-8, August.

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