Differential modulation of corticospinal excitability during haptic sensing of 2-D patterns vs. textures

FieldValue
dc.contributor.authorTremblay, François
dc.contributor.authorMaster, Sabah
dc.date.accessioned2011-01-18T16:11:19Z
dc.date.available2011-01-18T16:11:19Z
dc.date.created2010
dc.date.issued2010
dc.identifier.urihttp://hdl.handle.net/10393/19707
dc.description.abstractBackground - Recently, we showed a selective enhancement in corticospinal excitability when participants actively discriminated raised 2-D symbols with the index finger. This extra-facilitation likely reflected activation in the premotor and dorsal prefrontal cortices modulating motor cortical activity during attention to haptic sensing. However, this parieto-frontal network appears to be finely modulated depending upon whether haptic sensing is directed towards material or geometric properties. To examine this issue, we contrasted changes in corticospinal excitability when young adults (n = 18) were engaged in either a roughness discrimination on two gratings with different spatial periods, or a 2-D pattern discrimination of the relative offset in the alignment of a row of small circles in the upward or downward direction. // Results - A significant effect of task conditions was detected on motor evoked potential amplitudes, reflecting the observation that corticospinal facilitation was, on average, ~18% greater in the pattern discrimination than in the roughness discrimination. // Conclusions - This differential modulation of corticospinal excitability during haptic sensing of 2-D patterns vs. roughness is consistent with the existence of preferred activation of a visuo-haptic cortical dorsal stream network including frontal motor areas during spatial vs. intensive processing of surface properties in the haptic system.
dc.language.isoen
dc.titleDifferential modulation of corticospinal excitability during haptic sensing of 2-D patterns vs. textures
dc.typeArticle
dc.identifier.doi10.1186/1471-2202-11-149
CollectionPublications en libre accès financées par uOttawa // uOttawa financed open access publications
Sciences de la réadaptation - Publications // Rehabilitation Sciences - Publications

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