Anticipation increases tactile stimulus processing in the ipsilateral primary somatosensory cortex
Source
Cerebral Cortex, 24, 10, (2014), pp. 2562-2571ISSN
Publication type
Article / Letter to editor

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Organization
SW OZ DCC CO
Journal title
Cerebral Cortex
Volume
vol. 24
Issue
iss. 10
Languages used
English (eng)
Page start
p. 2562
Page end
p. 2571
Subject
Action, intention, and motor control; DI-BCB_DCC_Theme 4: Brain Networks and Neuronal CommunicationAbstract
Stimulus anticipation improves perception. To account for this improvement, we investigated how stimulus processing is altered by anticipation. In contrast to a large body of previous work, we employed a demanding perceptual task and investigated sensory responses that occur beyond early evoked activity in contralateral primary sensory areas: Stimulus-induced modulations of neural oscillations. For this, we recorded magnetoencephalography in 19 humans while they performed a cued tactile identification task involving the identification of either a proximal or a distal stimulation on the fingertips. We varied the cue-target interval between 0 and 1000 ms such that tactile targets occurred at various degrees of anticipation. This allowed us to investigate the influence of anticipation on stimulus processing in a parametric fashion. We observed that anticipation increases the stimulus-induced response (suppression of beta-band oscillations) originating from the ipsilateral primary somatosensory cortex. This occurs in the period in which the tactile memory trace is analyzed and is correlated with the anticipation-induced improvement in tactile perception. We propose that this ipsilateral response indicates distributed processing across bilateral primary sensory cortices, of which the extent increases with anticipation. This constitutes a new and potentially important mechanism contributing to perception and its improvement following anticipation.
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- Academic publications [227864]
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- Faculty of Social Sciences [28468]
- Open Access publications [76446]
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