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Multiple reference frames in cortical oscillatory activity during tactile remapping for saccades.

Verena N Buchholz1, Ole Jensen, W Pieter Medendorp

  • 1Radboud University Nijmegen, Donders Institute for Brain, Cognition and Behaviour, NL 6500 HE, Nijmegen, The Netherlands. verena.buchholz@donders.ru.nl

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 18, 2011
PubMed
Summary
This summary is machine-generated.

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The brain uses distinct reference frames for spatial processing, switching between body- and gaze-centered representations during tactile remapping for saccades. This neural activity reflects dynamic coding based on task demands.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Processing

Background:

  • The brain employs multiple reference frames for spatial processing, potentially creating population-level representations weighted by task demands.
  • Understanding how these reference frames are implemented in neural activity, particularly during sensorimotor transformations, is crucial.

Purpose of the Study:

  • To investigate the reference frames used in rhythmic neuronal synchronization during tactile remapping for saccades.
  • To determine if the brain utilizes distinct body- and gaze-centered representations during this process.

Main Methods:

  • Magnetoencephalography (MEG) was used to measure rhythmic neuronal synchronization in human subjects.
  • Tactile stimuli were presented to an invisible fingertip, followed by a saccade to the remembered location.

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  • Analysis focused on gamma-band (70-90 Hz, 85-115 Hz), alpha, and beta rhythms in somatosensory areas and the posterior parietal cortex (PPC).

    • Main Results:

    • A transient, body-centered gamma-band response (70-90 Hz) was observed in somatosensory areas contralateral to the stimulated hand.
    • A concurrent gaze-centered gamma-band response occurred in the PPC, even for unseen stimuli.
    • Lower-frequency rhythms (alpha, beta) showed body-centered modulations in somatosensory areas and mixed reference frames in the PPC.

    Conclusions:

    • Oscillatory activity dynamically codes information in both body- and gaze-centered reference frames during tactile remapping for saccades.
    • The PPC rapidly integrates eye and hand position information for sensory remapping.
    • These findings support the hypothesis of multiple, task-dependent reference frames in neural population activity.