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The fraction of an action is more than a movement: neural signatures of event segmentation in fMRI.

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.neuroimage.2012.04.008 Byline: Ricarda I. Schubotz, Franziska M. Korb, Anne-Marike Schiffer, Waltraud Stadler, D. Yves von Cramon Keywords: Event segmentation; Action; Superior frontal sulcus; Angular gyrus; P... Full description

Journal Title: NeuroImage July 16, 2012, Vol.61(4), pp.1195-1205
Main Author: Schubotz, Ricarda I
Other Authors: Korb, Franziska M , Schiffer, Anne-Marike , Stadler, Waltraud , Von Cramon, D Yves
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1095-9572 ; DOI: 10.1016/j.neuroimage.2012.04.008
Link: http://search.proquest.com/docview/1020831366/?pq-origsite=primo
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title: The fraction of an action is more than a movement: neural signatures of event segmentation in fMRI.
format: Article
creator:
  • Schubotz, Ricarda I
  • Korb, Franziska M
  • Schiffer, Anne-Marike
  • Stadler, Waltraud
  • Von Cramon, D Yves
subjects:
  • Adult–Physiology
  • Brain–Physiology
  • Brain Mapping–Physiology
  • Female–Physiology
  • Humans–Physiology
  • Image Interpretation, Computer-Assisted–Physiology
  • Magnetic Resonance Imaging–Physiology
  • Male–Physiology
  • Motion Perception–Physiology
  • Movement–Physiology
  • Young Adult–Physiology
ispartof: NeuroImage, July 16, 2012, Vol.61(4), pp.1195-1205
description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.neuroimage.2012.04.008 Byline: Ricarda I. Schubotz, Franziska M. Korb, Anne-Marike Schiffer, Waltraud Stadler, D. Yves von Cramon Keywords: Event segmentation; Action; Superior frontal sulcus; Angular gyrus; Parahippocampal cortex; fMRI Abstract: When we observe an action, we recognize meaningful action steps that help us to predict probable upcoming action steps. This segmentation of observed actions, or more generally events, has been proposed to rely in part on changes in motion features. However, segmentation of actions, in contrast to meaningless movements, may exploit additional information such as action knowledge. The present fMRI study sought to tear apart the neural signatures of processing two sources of information that observers may exploit at action boundaries: change in motion dynamics and action knowledge. To this end, subjects performed a segmentation task on both actions (that can be segmented based on motion and action knowledge) as well as tai chi movements (that can be segmented only based on motion) and two further control conditions that implemented point-light walker like displays of the same videos. Behavioral tests showed that motion features played a critical role in boundary detection in all conditions. Consistent with this finding, activity in area MT was enhanced during boundary detection in all conditions, but importantly, this effect was not stronger for actions. In contrast, only action boundary detection was reflected by specific activation in the superior frontal sulcus, parietal angular gyrus and the parahippocampal cortex. Based on these findings, we propose that during action observation, motion features trigger a top-down modulation of the attentional focus and the incitement of retrieving long-term memory place-action associations. While action perception entails activity common to processing of all motion stimuli, it is at the same time unique as it allows long-term memory based predictions of succeeding steps. Article History: Accepted 3 April 2012
language: eng
source:
identifier: E-ISSN: 1095-9572 ; DOI: 10.1016/j.neuroimage.2012.04.008
fulltext: fulltext
issn:
  • 10959572
  • 1095-9572
url: Link


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titleThe fraction of an action is more than a movement: neural signatures of event segmentation in fMRI.
creatorSchubotz, Ricarda I ; Korb, Franziska M ; Schiffer, Anne-Marike ; Stadler, Waltraud ; Von Cramon, D Yves
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subjectAdult–Physiology ; Brain–Physiology ; Brain Mapping–Physiology ; Female–Physiology ; Humans–Physiology ; Image Interpretation, Computer-Assisted–Physiology ; Magnetic Resonance Imaging–Physiology ; Male–Physiology ; Motion Perception–Physiology ; Movement–Physiology ; Young Adult–Physiology
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descriptionTo link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.neuroimage.2012.04.008 Byline: Ricarda I. Schubotz, Franziska M. Korb, Anne-Marike Schiffer, Waltraud Stadler, D. Yves von Cramon Keywords: Event segmentation; Action; Superior frontal sulcus; Angular gyrus; Parahippocampal cortex; fMRI Abstract: When we observe an action, we recognize meaningful action steps that help us to predict probable upcoming action steps. This segmentation of observed actions, or more generally events, has been proposed to rely in part on changes in motion features. However, segmentation of actions, in contrast to meaningless movements, may exploit additional information such as action knowledge. The present fMRI study sought to tear apart the neural signatures of processing two sources of information that observers may exploit at action boundaries: change in motion dynamics and action knowledge. To this end, subjects performed a segmentation task on both actions (that can be segmented based on motion and action knowledge) as well as tai chi movements (that can be segmented only based on motion) and two further control conditions that implemented point-light walker like displays of the same videos. Behavioral tests showed that motion features played a critical role in boundary detection in all conditions. Consistent with this finding, activity in area MT was enhanced during boundary detection in all conditions, but importantly, this effect was not stronger for actions. In contrast, only action boundary detection was reflected by specific activation in the superior frontal sulcus, parietal angular gyrus and the parahippocampal cortex. Based on these findings, we propose that during action observation, motion features trigger a top-down modulation of the attentional focus and the incitement of retrieving long-term memory place-action associations. While action perception entails activity common to processing of all motion stimuli, it is at the same time unique as it allows long-term memory based predictions of succeeding steps. Article History: Accepted 3 April 2012
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