Interruption of visually perceived forward motion in depth evokes a cortical activation shift from spatial to intentional motor regions

A. van der Hoorn, M. Beudel, B. M. de Jong*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)
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Abstract

Forward locomotion generates a radially expanding flow of visual motion which supports goal-directed walking. In stationary mode, wide-field visual presentation of optic flow stimuli evokes the illusion of forward self-motion. These effects illustrate an intimate relation between visual and motor processing. In the present fMRI study, we applied optic flow to identify distinct interfaces between circuitries implicated in vision and movement. The dorsal premotor cortex (PMd) was expected to contribute to wide-field forward motion flow (FFw), reflecting a pathway for externally triggered motor control. Medial prefrontal activation was expected to follow interrupted optic flow urging internally generated action. Data of 15 healthy subjects were analyzed with Statistical Parametric Mapping and confirmed this hypothesis. Right PMd activation was seen in FFw, together with activations of posterior parietal cortex, ventral V5, and the right fusiform gyms. Conjunction analysis of the transition from wide to narrow forward flow and reversed wide-field flow revealed selective dorsal medial prefrontal activation. These findings point at equivalent visuomotor transformations in locomotion and goal-directed hand movement, in which parietal-premotor circuitry is crucially implicated. Possible implications of an activation shift from spatial to intentional motor regions for understanding freezing of gait in Parkinson's disease are discussed: impaired medial prefrontal function in Parkinson's disease may reflect an insufficient internal motor drive when visual support from optic flow is reduced at the entrance of a narrow corridor. (C) 2010 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)160-171
Number of pages12
JournalBrain Research
Volume1358
DOIs
Publication statusPublished - 28-Oct-2010

Keywords

  • Optic flow
  • fMRI
  • Freezing of gait
  • Premotor cortex
  • Pre-SMA
  • POSTERIOR PARIETAL CORTEX
  • PARKINSONS-DISEASE
  • PREMOTOR CORTEX
  • SELF-MOTION
  • BASAL GANGLIA
  • HUMAN BRAIN
  • OPTIC FLOW
  • MOVEMENTS
  • PERCEPTION
  • REPRESENTATION

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