The neural basis of selection-for-action

Neurosci Lett. 2007 May 1;417(2):171-5. doi: 10.1016/j.neulet.2007.02.033. Epub 2007 Feb 14.

Abstract

The selection of objects in the visual environment is important in everyday life when acting in a goal-directed manner. Here we used functional magnetic resonance imaging (fMRI) to investigate brain activity while healthy subjects (N=15) selectively reached to grasp a three-dimensional (3D) target stimulus presented either in isolation or in the presence of 3D non-target stimuli. A pneumatic MRI compatible apparatus was designed to precisely control the presentation of 3D graspable stimuli within the scanner. During scanning subjects were instructed to reach and grasp towards a target presented at an unknown location either in isolation or flanked by two distractor objects. Results indicated that reaching towards and grasping the target object in the presence of other non-target stimuli was associated with greater activation within the contralateral primary motor cortex and the precuneus as compared to the execution of reach-to-grasp movements towards the target presented in isolation. We conclude that the presence of non-targets evokes a differential level of neural activity within areas responsible for the planning and execution of selective reach-to-grasp movement.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Brain / anatomy & histology
  • Brain / physiology*
  • Brain Mapping
  • Decision Making / physiology*
  • Female
  • Functional Laterality / physiology
  • Hand / innervation
  • Hand / physiology
  • Hand Strength / physiology*
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Motor Cortex / anatomy & histology
  • Motor Cortex / physiology
  • Movement / physiology*
  • Neuropsychological Tests
  • Parietal Lobe / anatomy & histology
  • Parietal Lobe / physiology
  • Photic Stimulation
  • Psychomotor Performance / physiology*
  • Space Perception / physiology*